CN118659318A - Icing line reclosing method and system based on waveform similarity - Google Patents
Icing line reclosing method and system based on waveform similarity Download PDFInfo
- Publication number
- CN118659318A CN118659318A CN202410667304.7A CN202410667304A CN118659318A CN 118659318 A CN118659318 A CN 118659318A CN 202410667304 A CN202410667304 A CN 202410667304A CN 118659318 A CN118659318 A CN 118659318A
- Authority
- CN
- China
- Prior art keywords
- reclosing
- waveform
- fault
- similarity
- data
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0092—Details of emergency protective circuit arrangements concerning the data processing means, e.g. expert systems, neural networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Human Computer Interaction (AREA)
- Artificial Intelligence (AREA)
- Evolutionary Computation (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
一种基于波形相似度的覆冰线路重合闸方法及系统。本发明涉及电力防灾减灾技术领域，通过采集并读取覆冰线路的实时电压数据，可以检测故障相跳闸时刻并避开复杂的暂态过程；通过处理所述电压数据，得到目标波形和模板波形，可以为后续判据提供波形相似度差异；通过根据所述目标波形和模板波形的波形相似度进行覆冰线路故障性质以及熄弧时刻判别，可以快速准确的识别故障性质以及熄弧时刻；通过根据所述故障性质与熄弧时刻发出覆冰线路重合闸指令，可以使发生瞬时性故障的覆冰线路快速恢复供电，并且还能够迅速纠正继电保护或者断路器的误动作，使整个输电系统的供电连续性、稳定性得到极大的提高。
A method and system for reclosing an ice-covered line based on waveform similarity. The present invention relates to the technical field of electric power disaster prevention and mitigation. By collecting and reading real-time voltage data of an ice-covered line, the tripping moment of the fault phase can be detected and complex transient processes can be avoided; by processing the voltage data, a target waveform and a template waveform are obtained, which can provide waveform similarity differences for subsequent judgment criteria; by judging the nature of the ice-covered line fault and the arc-extinguishing moment based on the waveform similarity of the target waveform and the template waveform, the nature of the fault and the arc-extinguishing moment can be quickly and accurately identified; by issuing an ice-covered line reclosing command based on the fault nature and the arc-extinguishing moment, the ice-covered line with a transient fault can be quickly restored to power supply, and the malfunction of the relay protection or the circuit breaker can be quickly corrected, so that the power supply continuity and stability of the entire power transmission system are greatly improved.
Description
Technical Field
The invention relates to the technical field of power disaster prevention and reduction, in particular to an icing circuit reclosing method and system based on waveform similarity.
Background
With the expansion of the power grid scale, the power transmission lines are increasingly increased through complex geographic environments and severe weather conditions, and the icing overload of the power transmission lines can be caused by the extreme weather conditions such as ice, snow and the like caused by micro-terrains and microclimate areas, so that heavy accidents such as icing galloping, broken lines, tower falling and the like are caused. In addition, the icing insulator can greatly reduce the external insulation electrical strength, so that flashover accidents are extremely easy to occur under normal working voltage, line tripping and even large-area power failure of a power grid are caused, and the safe operation of the power grid is seriously threatened.
The icing disaster easily causes power facility faults, can cause serious load impact and operation pressure to the power grid, and can cause serious economic loss and social influence. The abnormal condition of the power grid can be timely sensed and the decision of breaking the fault or reclosing input can be made through quick and accurate reclosing, so that the power supply interruption time is shortened, the power grid load is lightened, the disaster resistance and emergency response capability of the power grid are improved, and the running efficiency and stability of the power grid and the reliability of power supply are improved.
Disclosure of Invention
The present invention has been made in view of the above-described problems occurring in the prior art.
Therefore, the invention provides the reclosing method of the icing line based on the waveform similarity, which can accurately measure the voltage data of the icing line, can monitor the real-time information of the icing line, and can rapidly and accurately judge the fault property and the arc extinguishing moment and respond after the line tripping caused by the icing disaster, thereby reducing the influence of the power transmission line tripping caused by the icing disaster on the normal operation of a power grid.
In order to solve the technical problems, the invention provides a reclosing method of an icing line based on waveform similarity, which comprises the following steps: collecting and reading real-time voltage data of the ice coating circuit; processing the voltage data to obtain a target waveform and a template waveform, and adjusting the template waveform in real time through a self-adaptive algorithm; judging the fault property of the ice coating line and the arc extinguishing moment according to the waveform similarity of the target waveform and the template waveform; and through the linkage of the ice coating thickness monitoring and the reclosing strategy, fault data are integrated into a reclosing decision, the reclosing condition and time are automatically adjusted according to the ice coating thickness, and an instruction is sent out.
As a preferable scheme of the ice coating line reclosing method based on waveform similarity, the invention comprises the following steps: the real-time voltage data comprises that after the ice-covered tripping of the power transmission line, faults enter a secondary arc stage, and the secondary arc stage contains a large number of harmonic waves due to repeated extinction and reburning of the arc, so that the components are complex, are highly nonlinear and cause interference to criteria;
And reading a real-time sampling sequence of the three-phase voltage at the ice-covered line side, monitoring the running state of the power transmission line, and avoiding the transient process after detecting that the line has single-phase grounding fault and detecting that the fault phase trips.
As a preferable scheme of the ice coating line reclosing method based on waveform similarity, the invention comprises the following steps: the processing voltage data comprises that for the single-phase earth fault of the transmission line, after eliminating the voltage magnitude and non-periodic component information of the fault phase, the ideal waveform is a sine wave, and the acquired three-phase voltage sequence is normalized to obtain a target waveform; synchronously generating a standard sine wave with the same sampling rate as the target waveform as a template waveform:
the data normalization process includes:
Wherein, X norm represents the normalized value, X represents the original value, and X min、Xmax represents the minimum value and the maximum value in the dataset, respectively;
the target waveform is:
M(t)＝sin(2πft)
where f is the frequency of the sine wave and t is time;
generating a standard sine wave template waveform with the same sampling rate as the target waveform using synchronous compression wavelet transform:
Where N (t) is the generated template waveform, V ref is the reference voltage signal, SSWT (V ref)k (t) is the kth component of the SSWT transform, and f k and φ k are the frequency and phase, respectively, of the kth component.
As a preferable scheme of the ice coating line reclosing method based on waveform similarity, the invention comprises the following steps: the adaptive algorithm adjusting the template waveform in real time includes using the adaptive algorithm to adjust the template waveform in real time, matching the dynamic change of the target waveform, the adaptive algorithm adjusting the template waveform according to the difference between the actually measured voltage waveform and the predicted waveform:
Where N' (t) represents the adjusted template waveform, N (t) is the original template waveform, W (t i) represents the value of the target waveform at time point t i, a represents the learning rate, for controlling the convergence rate of the algorithm, N represents the number of samples, g (E (t i)) represents a complex information filtering function, E (t i) represents an environmental parameter, E 0 represents a reference value of the environmental parameter, β represents a filtering parameter, and i·i represents the euclidean distance of the vector.
As a preferable scheme of the ice coating line reclosing method based on waveform similarity, the invention comprises the following steps: the fault property and arc extinction moment discrimination comprises the steps of adopting a Hausdorff distance algorithm to calculate the similarity between the target waveform and the template waveform, and setting a setting value H set for comparison:
H(A，B)＝max{h(A，B)，h(B，A)}
Wherein A is the data set of the target waveform, B is the data set of the template waveform, h (A, B) is the directed distance from A to B, h (B, A) is the directed distance from B to A,
When the calculated similarity H is larger than H set, judging that the fault property is transient fault, when H is detected to be equal to H set, judging that the moment is arc extinction moment, and when the similarity H is smaller than H set, judging that the fault property is permanent fault;
and when the permanent fault is judged, a reclosing stopping instruction is sent out, and when the transient fault is judged, an accelerating reclosing instruction is sent out to reclose after the arc extinction moment is judged.
As a preferable scheme of the ice coating line reclosing method based on waveform similarity, the invention comprises the following steps: the linkage of the icing thickness monitoring and reclosing strategy comprises the steps of providing an icing thickness monitoring device, monitoring the icing thickness of a lead in real time, transmitting data to a monitoring center in a wireless mode at a data transmission frequency not lower than once every minute, integrating the icing thickness data with the existing environmental data of voltage, current, temperature and humidity, and then preprocessing;
when the thickness of the ice coating reaches a set first-level threshold value, the system enters an early warning state, automatically sends early warning information of the thickness of the ice coating to maintenance personnel, and starts an auxiliary heating system or a preliminary measure for spraying ice melting liquid;
when the thickness of the ice coating reaches a second-level threshold value, the system enters a preparation state, the reclosing condition is automatically adjusted according to the thickness of the ice coating and environmental parameters, the tension of a wire is increased, the development trend of the ice coating is predicted by using a machine learning algorithm, and the ice coating falling time point is estimated;
When the thickness of the ice coating reaches a three-level threshold value, the system triggers an execution state, and when the thickness of the ice coating reaches the execution threshold value, the system automatically sends an execution instruction to the reclosing device, and all monitoring data, early warning information, adjustment measures and the execution instruction are recorded.
As a preferable scheme of the ice coating line reclosing method based on waveform similarity, the invention comprises the following steps: the method comprises the steps of adjusting the reclosing conditions and the moment and sending instructions, wherein when the conditions and the moment are judged to be permanent faults, immediately sending instructions for stopping reclosing to a reclosing device, avoiding further equipment damage and safety risks, and automatically sending fault notification to a maintenance team by a system, wherein the fault notification comprises fault types, positions and recommended maintenance measures; when the arc extinction moment is judged, the system immediately sends an instruction for accelerating reclosing to the reclosing device, and power supply is restored;
Considering the current load condition of the system, avoiding reclosing operation in a peak period, selecting an optimal maintenance time window for reclosing, and reducing the influence on a user;
when the system load is lower than a set threshold value, the reclosing operation is preferentially carried out, and if the system load is too high, the reclosing operation is delayed until the load is reduced to a safe level;
the night or the low-peak period of the electricity consumption of the user is selected to reclose, so that the influence on the user is reduced;
Reclosing when the standby power supply is sufficient, ensuring that the capacity of the standby power supply is sufficient to cover the load in the reclosing process, delaying reclosing when the standby power supply is insufficient, preferentially ensuring the key load, and delaying reclosing operation; when an emergency situation including an important load interruption occurs, the preparation time for reclosing is shortened.
Another object of the present invention is to provide an ice-covered line reclosing system based on waveform similarity, which can intelligently decide whether to perform a reclosing operation according to fault properties and arc extinction time, and determine an optimal reclosing time to reduce the influence on a user.
As a preferable scheme of the icing circuit reclosing system based on waveform similarity, the invention comprises the following steps: the system comprises a real-time data acquisition and preprocessing module, a fault detection and waveform analysis module, a similarity calculation and fault discrimination module, a reclosing decision and instruction generation module, an instruction execution and control system and a data management and man-machine interaction module;
the real-time data acquisition and preprocessing module acquires real-time voltage data of the icing line and performs preprocessing to obtain an accurate voltage waveform;
the fault detection and waveform analysis module detects the tripping moment of a fault phase, avoids a transient process, and processes voltage data to obtain a target waveform and a template waveform;
The similarity calculation and fault discrimination module calculates the similarity between the target waveform and the template waveform, and discriminates fault properties and arc extinction time according to a similarity analysis result;
The reclosing decision and instruction generation module decides whether to send out a reclosing instruction according to the fault discrimination result, and determines the optimal reclosing time;
The instruction execution and control system receives and executes a reclosing instruction and controls reclosing operation of the icing line so as to recover power supply or correct misoperation;
The data management and man-machine interaction module stores and manages real-time data, waveform data, fault discrimination results and the like, provides an interface for monitoring the running state of the system, and allows operators to monitor and intervene in the system.
A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of a method for reclosing an icing line based on waveform similarity when executing the computer program.
A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor implements the steps of a method for reclosing an ice-covered wire based on waveform similarity.
The invention has the beneficial effects that: the fault phase trip time can be detected and complex transient processes avoided. And providing waveform similarity differences for subsequent criteria by processing the voltage data. And sending out a reclosing instruction of the icing line according to the fault property and the arc extinguishing moment, so that the icing line with the transient fault can quickly recover power supply, relay protection or misoperation of a breaker can be quickly corrected, and the power supply continuity and stability of the whole power transmission system are greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
Fig. 1 is a schematic flow chart of an icing circuit reclosing method based on waveform similarity according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a working module of an icing circuit reclosing system based on waveform similarity according to an embodiment of the present invention.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
While the embodiments of the present invention have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Also in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1, in a first embodiment of the present invention, the embodiment provides an icing circuit reclosing method based on waveform similarity, including:
s1: and collecting and reading real-time voltage data of the ice coating circuit.
Further, the real-time voltage data comprises that after the ice-covered tripping of the power transmission line, the fault enters a secondary arc stage, and the repeated extinction and reburning of the arc enable the secondary arc stage to contain a large number of harmonic waves, so that the components are complex, are highly nonlinear and cause interference to criteria;
And reading a real-time sampling sequence of the three-phase voltage at the ice-covered line side, monitoring the running state of the power transmission line, and avoiding the transient process after detecting that the line has single-phase grounding fault and detecting that the fault phase trips.
S2: and processing the voltage data to obtain a target waveform and a template waveform, and adjusting the template waveform in real time through a self-adaptive algorithm.
Further, the processing voltage data comprises that for the single-phase earth fault of the transmission line, after eliminating the voltage magnitude and the non-periodic component information of the fault phase, the ideal waveform is a sine wave, and the acquired three-phase voltage sequence is normalized to obtain a target waveform; synchronously generating a standard sine wave with the same sampling rate as the target waveform as a template waveform:
the data normalization process includes:
Wherein, X norm represents the normalized value, X represents the original value, and X min、Xmax represents the minimum value and the maximum value in the dataset, respectively;
the target waveform is:
M(t)＝sin(2πft)
where f is the frequency of the sine wave and t is time;
generating a standard sine wave template waveform with the same sampling rate as the target waveform using synchronous compression wavelet transform:
Where N (t) is the generated template waveform, V ref is the reference voltage signal, SSWT (V ref)k (t) is the kth component of the SSWT transform, and f k and φ k are the frequency and phase, respectively, of the kth component.
Still further, the adaptive algorithm adjusting the template waveform in real time includes using the adaptive algorithm to adjust the template waveform in real time to match the dynamic change of the target waveform, the adaptive algorithm adjusting the template waveform based on the difference between the actual measured voltage waveform and the predicted waveform:
Where N' (t) represents the adjusted template waveform, N (t) is the original template waveform, W (t i) represents the value of the target waveform at time point t i, a represents the learning rate, for controlling the convergence rate of the algorithm, N represents the number of samples, g (E (t i)) represents a complex information filtering function, E (t i) represents an environmental parameter, E 0 represents a reference value of the environmental parameter, β represents a filtering parameter, and i·i represents the euclidean distance of the vector.
S3: and judging the fault property of the ice coating line and the arc extinguishing moment according to the waveform similarity of the target waveform and the template waveform.
Further, the fault property and the arc extinguishing moment discrimination includes that a Hausdorff distance algorithm is adopted to calculate the similarity between the target waveform and the template waveform, and a setting value H set is set for comparison:
H(A，B)＝max{h(A，B)，h(B，A)}
Wherein A is the data set of the target waveform, B is the data set of the template waveform, h (A, B) is the directed distance from A to B, h (B, A) is the directed distance from B to A,
When the calculated similarity H is larger than H set, judging that the fault property is transient fault, when H is detected to be equal to H set, judging that the moment is arc extinction moment, and when the similarity H is smaller than H set, judging that the fault property is permanent fault;
and when the permanent fault is judged, a reclosing stopping instruction is sent out, and when the transient fault is judged, an accelerating reclosing instruction is sent out to reclose after the arc extinction moment is judged.
S4: and through the linkage of the ice coating thickness monitoring and the reclosing strategy, fault data are integrated into a reclosing decision, the reclosing condition and time are automatically adjusted according to the ice coating thickness, and an instruction is sent out.
Furthermore, the linkage of the icing thickness monitoring and reclosing strategy comprises the steps of providing an icing thickness monitoring device, monitoring the icing thickness of a wire in real time, transmitting data to a monitoring center in a wireless mode at a data transmission frequency of not lower than once every minute, integrating the icing thickness data with the existing environmental data of voltage, current, temperature and humidity, and then preprocessing;
when the thickness of the ice coating reaches a set first-level threshold value, the system enters an early warning state, automatically sends early warning information of the thickness of the ice coating to maintenance personnel, and starts an auxiliary heating system or a preliminary measure for spraying ice melting liquid;
when the thickness of the ice coating reaches a second-level threshold value, the system enters a preparation state, the reclosing condition is automatically adjusted according to the thickness of the ice coating and environmental parameters, the tension of a wire is increased, the development trend of the ice coating is predicted by using a machine learning algorithm, and the ice coating falling time point is estimated;
When the thickness of the ice coating reaches a three-level threshold, the system triggers an execution state, and when the thickness of the ice coating reaches the execution threshold, the system automatically sends an execution instruction to the reclosing device, and all monitoring data, early warning information, adjustment measures and the execution instruction are recorded at the same time so as to facilitate subsequent analysis.
Further, the adjusting the condition and the time of reclosing and sending the instruction comprises immediately sending an instruction for stopping reclosing to a reclosing device when the permanent fault is judged, so that further equipment damage and safety risk are avoided, and the system automatically sends a fault notification to a maintenance team, wherein the fault notification comprises a fault type, a position and recommended maintenance measures; when the arc extinction moment is judged, the system immediately sends an instruction for accelerating reclosing to the reclosing device, and power supply is restored;
Considering the current load condition of the system, avoiding reclosing operation in a peak period, selecting an optimal maintenance time window for reclosing, and reducing the influence on a user;
when the system load is lower than a set threshold value, the reclosing operation is preferentially carried out, and if the system load is too high, the reclosing operation is delayed until the load is reduced to a safe level;
the night or the low-peak period of the electricity consumption of the user is selected to reclose, so that the influence on the user is reduced;
Reclosing when the standby power supply is sufficient, ensuring that the capacity of the standby power supply is sufficient to cover the load in the reclosing process, delaying reclosing when the standby power supply is insufficient, preferentially ensuring the key load, and delaying reclosing operation; when an emergency situation including an important load interruption occurs, the preparation time for reclosing is shortened.
Example 2
In order to verify the beneficial effects of the invention, the invention is scientifically demonstrated through experiments.
According to experimental requirements, parameters of the icing line simulation device, including icing degree, temperature and the like, are set so as to simulate different icing states. And carrying out repeated reclosing operation on the analog line by using a reclosing control system, and recording the time and the times of each operation. Before and after each reclosing, the waveform acquisition equipment is used for recording the current and voltage waveforms of the circuit, and data are stored for later analysis. The acquired waveform data are processed and analyzed by using data analysis software, the waveform similarity is calculated, and the waveform similarity is compared with the traditional reclosing method.
10 Experiments are carried out, reclosing operation is carried out under the conditions of light icing, medium icing and repeated icing in each experiment, and waveform similarity and reclosing results are recorded.
TABLE 1
| Experiment number | Degree of icing | Waveform similarity | Number of reclosings | Reclosing success rate |
| 1 | Light weight | 0.85 | 2 | 100％ |
| 2 | Light weight | 0.90 | 1 | 100％ |
| 3 | In (a) | 0.75 | 3 | 66％ |
| 4 | In (a) | 0.80 | 2 | 100％ |
| 5 | Heavy weight | 0.60 | 4 | 50％ |
| 6 | Heavy weight | 0.65 | 3 | 33％ |
| 7 | Light weight | 0.88 | 1 | 100％ |
| 8 | In (a) | 0.78 | 2 | 100％ |
| 9 | Heavy weight | 0.62 | 5 | 20％ |
| 10 | Heavy weight | 0.68 | 4 | 25％ |
The result of the experiment shows that the reclosing method of the icing line based on the waveform similarity can effectively evaluate the state of the icing line and guide the reclosing operation. In addition, experimental results also show that the icing degree has obvious influence on the waveform similarity and the reclosing success rate. Therefore, in practical application, the reclosing strategy can be adjusted according to the icing degree so as to improve the success rate and efficiency of reclosing.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Example 3
A third embodiment of the present invention, which is different from the first two embodiments, is:
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-only memory (ROM), a random access memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Example 4
Referring to fig. 2, for an embodiment of the present invention, an icing circuit reclosing system based on waveform similarity is provided, which is characterized in that: the device comprises a real-time data acquisition and preprocessing module, a fault detection and waveform analysis module, a similarity calculation and fault discrimination module, a reclosing decision and instruction generation module, an instruction execution and control system and a data management and man-machine interaction module.
And the real-time data acquisition and preprocessing module acquires real-time voltage data of the icing line and performs preprocessing to obtain an accurate voltage waveform.
The fault detection and waveform analysis module detects the tripping moment of the fault phase, avoids the transient process, and processes the voltage data to obtain a target waveform and a template waveform.
And the similarity calculation and fault discrimination module calculates the similarity of the target waveform and the template waveform, and discriminates the fault property and the arc extinction moment according to the similarity analysis result.
And the reclosing decision and instruction generation module decides whether to send out a reclosing instruction according to the fault discrimination result, and determines the optimal reclosing time.
And the instruction execution and control system receives and executes the reclosing instruction and controls the reclosing operation of the icing line so as to recover power supply or correct misoperation.
And the data management and man-machine interaction module is used for storing and managing real-time data, waveform data, fault discrimination results and the like, providing an interface for monitoring the running state of the system and allowing operators to monitor and intervene in the system.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. An icing circuit reclosing method based on waveform similarity is characterized by comprising the following steps of: comprising the steps of (a) a step of,
Collecting and reading real-time voltage data of the ice coating circuit;
Processing the voltage data to obtain a target waveform and a template waveform, and adjusting the template waveform in real time through a self-adaptive algorithm;
judging the fault property of the ice coating line and the arc extinguishing moment according to the waveform similarity of the target waveform and the template waveform;
And through the linkage of the ice coating thickness monitoring and the reclosing strategy, fault data are integrated into a reclosing decision, the reclosing condition and time are automatically adjusted according to the ice coating thickness, and an instruction is sent out.
2. The icing circuit reclosing method based on waveform similarity as claimed in claim 1, wherein: the real-time voltage data comprises that after the ice-covered tripping of the power transmission line, faults enter a secondary arc stage, and the secondary arc stage contains a large number of harmonic waves due to repeated extinction and reburning of the arc, so that the components are complex, are highly nonlinear and cause interference to criteria;
And reading a real-time sampling sequence of the three-phase voltage at the ice-covered line side, monitoring the running state of the power transmission line, and avoiding the transient process after detecting that the line has single-phase grounding fault and detecting that the fault phase trips.
3. The method for reclosing the icing circuit based on waveform similarity as claimed in claim 2, wherein the method comprises the following steps: the processing voltage data comprises that for the single-phase earth fault of the transmission line, after eliminating the voltage magnitude and non-periodic component information of the fault phase, the ideal waveform is a sine wave, and the acquired three-phase voltage sequence is normalized to obtain a target waveform; synchronously generating a standard sine wave with the same sampling rate as the target waveform as a template waveform:
the data normalization process includes:
Wherein, X norm represents the normalized value, X represents the original value, and X min、Xmax represents the minimum value and the maximum value in the dataset, respectively;
the target waveform is:
M(t)＝sin(2πft)
where f is the frequency of the sine wave and t is time;
generating a standard sine wave template waveform with the same sampling rate as the target waveform using synchronous compression wavelet transform:
Where N (t) is the generated template waveform, V ref is the reference voltage signal, SSWT (V ref)k (t) is the kth component of the SSWT transform, and f k and φ k are the frequency and phase, respectively, of the kth component.
4. The icing circuit reclosing method based on waveform similarity as claimed in claim 3, wherein: the adaptive algorithm adjusting the template waveform in real time includes using the adaptive algorithm to adjust the template waveform in real time, matching the dynamic change of the target waveform, the adaptive algorithm adjusting the template waveform according to the difference between the actually measured voltage waveform and the predicted waveform:
Wherein N' (t) represents an adjusted template waveform, N (t) is an original template waveform, W (t i) represents a value of a target waveform at a time point t i, α represents a learning rate, for controlling a convergence rate of an algorithm, N represents a sample number, g (E (t i)) represents a complex information filtering function, E (t i) represents an environmental parameter, E 0 represents a reference value of the environmental parameter, β represents a filtering parameter, and ii represents a euclidean distance of a vector.
5. The method for reclosing the icing circuit based on waveform similarity as claimed in claim 4, wherein the method comprises the following steps: the fault property and arc extinction moment discrimination comprises the steps of adopting a Hausdorff distance algorithm to calculate the similarity between the target waveform and the template waveform, and setting a setting value H set for comparison:
H(A,B)＝max{h(A,B),h(B,A)}
Wherein B is the data set of the target waveform, B is the data set of the template waveform, h (A, B) is the directed distance from A to B, h (B, A) is the directed distance from B to A,
When the calculated similarity H is larger than H set, judging that the fault property is transient fault, when H is detected to be equal to H set, judging that the moment is arc extinction moment, and when the similarity H is smaller than H set, judging that the fault property is permanent fault;
and when the permanent fault is judged, a reclosing stopping instruction is sent out, and when the transient fault is judged, an accelerating reclosing instruction is sent out to reclose after the arc extinction moment is judged.
6. The method for reclosing the icing circuit based on waveform similarity according to claim 5, wherein the method comprises the following steps: the linkage of the icing thickness monitoring and reclosing strategy comprises the steps of providing an icing thickness monitoring device, monitoring the icing thickness of a lead in real time, transmitting data to a monitoring center in a wireless mode at a data transmission frequency not lower than once every minute, integrating the icing thickness data with the existing environmental data of voltage, current, temperature and humidity, and then preprocessing;
when the thickness of the ice coating reaches a set first-level threshold value, the system enters an early warning state, automatically sends early warning information of the thickness of the ice coating to maintenance personnel, and starts an auxiliary heating system or a preliminary measure for spraying ice melting liquid;
when the thickness of the ice coating reaches a second-level threshold value, the system enters a preparation state, the reclosing condition is automatically adjusted according to the thickness of the ice coating and environmental parameters, the tension of a wire is increased, the development trend of the ice coating is predicted by using a machine learning algorithm, and the ice coating falling time point is estimated;
When the thickness of the ice coating reaches a three-level threshold value, the system triggers an execution state, and when the thickness of the ice coating reaches the execution threshold value, the system automatically sends an execution instruction to the reclosing device, and all monitoring data, early warning information, adjustment measures and the execution instruction are recorded.
7. The method for reclosing the icing circuit based on waveform similarity as claimed in claim 6, wherein the method comprises the following steps: the method comprises the steps of adjusting the reclosing conditions and the moment and sending instructions, wherein when the conditions and the moment are judged to be permanent faults, immediately sending instructions for stopping reclosing to a reclosing device, avoiding further equipment damage and safety risks, and automatically sending fault notification to a maintenance team by a system, wherein the fault notification comprises fault types, positions and recommended maintenance measures; when the arc extinction moment is judged, the system immediately sends an instruction for accelerating reclosing to the reclosing device, and power supply is restored;
Considering the current load condition of the system, avoiding reclosing operation in a peak period, selecting an optimal maintenance time window for reclosing, and reducing the influence on a user;
when the system load is lower than a set threshold value, the reclosing operation is preferentially carried out, and if the system load is too high, the reclosing operation is delayed until the load is reduced to a safe level;
the night or the low-peak period of the electricity consumption of the user is selected to reclose, so that the influence on the user is reduced;
Reclosing when the standby power supply is sufficient, ensuring that the capacity of the standby power supply is sufficient to cover the load in the reclosing process, delaying reclosing when the standby power supply is insufficient, preferentially ensuring the key load, and delaying reclosing operation; when an emergency situation including an important load interruption occurs, the preparation time for reclosing is shortened.
8. A system employing the icing circuit reclosing method based on waveform similarity according to any one of claims 1-7, wherein: the system comprises a real-time data acquisition and preprocessing module, a fault detection and waveform analysis module, a similarity calculation and fault discrimination module, a reclosing decision and instruction generation module, an instruction execution and control system and a data management and man-machine interaction module;
the real-time data acquisition and preprocessing module acquires real-time voltage data of the icing line and performs preprocessing to obtain an accurate voltage waveform;
the fault detection and waveform analysis module detects the tripping moment of a fault phase, avoids a transient process, and processes voltage data to obtain a target waveform and a template waveform;
The similarity calculation and fault discrimination module calculates the similarity between the target waveform and the template waveform, and discriminates fault properties and arc extinction time according to a similarity analysis result;
The reclosing decision and instruction generation module decides whether to send out a reclosing instruction according to the fault discrimination result, and determines the optimal reclosing time;
The instruction execution and control system receives and executes a reclosing instruction and controls reclosing operation of the icing line so as to recover power supply or correct misoperation;
The data management and man-machine interaction module stores and manages real-time data, waveform data, fault discrimination results and the like, provides an interface for monitoring the running state of the system, and allows operators to monitor and intervene in the system.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410667304.7A CN118659318A (en) | 2024-05-28 | 2024-05-28 | Icing line reclosing method and system based on waveform similarity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410667304.7A CN118659318A (en) | 2024-05-28 | 2024-05-28 | Icing line reclosing method and system based on waveform similarity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118659318A true CN118659318A (en) | 2024-09-17 |
Family
ID=92704613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410667304.7A Pending CN118659318A (en) | 2024-05-28 | 2024-05-28 | Icing line reclosing method and system based on waveform similarity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118659318A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120601629A (en) * | 2025-08-08 | 2025-09-05 | 嘉控电力股份有限公司 | An intelligent reclosing circuit breaker control system |
-
2024
- 2024-05-28 CN CN202410667304.7A patent/CN118659318A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120601629A (en) * | 2025-08-08 | 2025-09-05 | 嘉控电力股份有限公司 | An intelligent reclosing circuit breaker control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9276396B2 (en) | Power transmission fault analysis system and related method | |
| CN101187687B (en) | High resistance ground fault detection method based on transient traveling wave | |
| CN108963962B (en) | Multilevel arc fault circuit breaking system | |
| CN102135555B (en) | Series arcing fault identifying method for low-voltage system | |
| CN109066620A (en) | A kind of HVDC transmission line protective device based on single-ended transient | |
| CN201234124Y (en) | Single-phase grounding failure wire selection automatic processing equipment for low current grounding system | |
| CN120090329B (en) | Control method and system for bidirectional charging and discharging circuit | |
| CN113109737A (en) | Method for identifying turn-to-turn short circuit fault of series reactor in power capacitor complete device | |
| CN118659318A (en) | Icing line reclosing method and system based on waveform similarity | |
| CN114498552A (en) | Residual current-based low-voltage power distribution network leakage protection method | |
| CN106532641A (en) | Protection method of parallel dry type air-core reactor based on current and voltage phase angles | |
| CN104332968B (en) | Current differential protection method based on HVDC transmission line | |
| CN108008242A (en) | Dry-type reactor turn-to-turn fault protection device and identification method | |
| CN104113050A (en) | Single-phase grounding fault self-recovery method | |
| CN115441408A (en) | A dry-type reactor protection device | |
| CN114415005A (en) | Method and device for identifying three-phase inconsistency of circuit breaker | |
| CN120801934A (en) | Direct current arc discharge detection system and method for energy storage system | |
| CN119382049A (en) | A short-circuit fault suppression method based on transient recovery voltage | |
| CN116466193A (en) | Multi-loop cable fault management and control device | |
| CN112202152B (en) | Feeder fault rapid isolation method based on CT saturation characteristics | |
| CN111123031B (en) | Fault detection method and low-voltage energy storage pre-operation group device, controller and system | |
| CN106504809B (en) | A kind of method and device for preventing nuclear-power reactor accident shutdown | |
| Mallahi et al. | Kullback–Leibler Divergence‐Based Fault Detection Scheme for 100% Inverter Interfaced Autonomous Microgrids | |
| CN118801577B (en) | Remote opening/closing control system based on special transformer terminal | |
| CN114999845B (en) | An intelligent reclosing system based on transformer vibration characteristics during short-circuit faults |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |