CN120870865A - Safety management method, device, equipment and medium for motor bench test - Google Patents
Safety management method, device, equipment and medium for motor bench testInfo
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Abstract
本申请涉及一种电机台架测试安全管理方法、装置、设备和介质，涉及电机领域。所述方法包括：获取回馈路径中能量流的三相电流纹波数据；基于三相电流纹波数据进行特征分析，确定异常发热源信息；基于回馈路径的监测数据，计算各回馈路径的阻抗值和阻抗变化率，确定风险路径；其中，回馈路径为能量流从电机流向电网和/或储能单元的路径；基于异常发热源信息和风险路径，更新第一回馈路径；基于第一回馈路径进行路径切换，并触发预警信号。采用本方法能够保证测试的安全性。
This application relates to a method, apparatus, equipment, and medium for safety management of motor bench testing, and pertains to the field of motors. The method includes: acquiring three-phase current ripple data of energy flow in the feedback path; performing feature analysis based on the three-phase current ripple data to determine abnormal heat source information; calculating the impedance value and impedance change rate of each feedback path based on monitoring data of the feedback path to determine risk paths; wherein, the feedback path is the path from the motor to the power grid and/or energy storage unit; updating the first feedback path based on the abnormal heat source information and risk paths; switching paths based on the first feedback path and triggering an early warning signal. This method ensures the safety of the test.
Description
Technical Field
The present application relates to the field of computer technologies, and in particular, to a method, an apparatus, a device, and a medium for safety management of motor rack testing.
Background
The motor is used as a core power source of the new energy automobile, and the performance quality of the motor directly determines the power output, the cruising ability and the running stability of the automobile, so that the accurate evaluation of the motor performance becomes a key link of industrial development. The motor bench test is used as a core means for evaluating the electrical performance, mechanical performance and reliability of the motor, and realizes comprehensive detection of the full life cycle performance of the motor by simulating various actual working conditions such as starting, accelerating and braking of the vehicle.
The motor bench test is used as a key link for evaluating the performance of a motor, and the operation safety of the motor bench test directly influences the accuracy of test data, the continuity of a test flow and the service life of equipment. However, the existing motor rack test system still has defects in functional links, so that potential safety hazards cannot be avoided in advance in the test process, and the safety cannot be effectively ensured.
Therefore, ensuring the safe operation of the motor rack test system in the full test period has become a current urgent problem to be solved.
Disclosure of Invention
The application provides a motor rack test safety management method, a motor rack test safety management device, motor rack test safety management equipment and motor rack test safety management media, and test safety can be guaranteed.
In order to achieve the above purpose, the application adopts the following technical scheme:
in a first aspect, the present application provides a motor rack test safety management method, including:
acquiring three-phase current ripple data of energy flow in a feedback path;
performing characteristic analysis based on the three-phase current ripple data, and determining abnormal heating source information;
calculating the impedance value and the impedance change rate of each feedback path based on the monitoring data of the feedback paths, and determining a risk path, wherein the feedback paths are paths for energy flow from the motor to the power grid and/or the energy storage unit;
updating the first feedback path based on the abnormal heating source information and the risk path;
and switching paths based on the first feedback path and triggering an early warning signal.
In one embodiment, performing a feature analysis based on three-phase current ripple data, determining abnormal heating source information includes:
and comparing the characteristic vector with a fault vector in a preset fault vector library to determine abnormal heating source information.
In one embodiment, determining the risk path includes:
For each feedback path, determining the feedback path as a risk path when the impedance value of the feedback path is greater than an impedance reference value and/or the impedance change rate of the feedback path is greater than a change threshold.
In one embodiment, updating the first feedback path based on the abnormal heat source information and the risk path includes:
And calculating based on the first weight, the second weight, the first impedance value, the first heating rate value, the impedance value of the feedback path and the heating rate to obtain a first path value corresponding to the feedback path, wherein the first weight is a weighting coefficient corresponding to the impedance value, the second weight is a weighting coefficient corresponding to the heating rate, the first impedance value is a reference value for normalizing the impedance value, the first heating rate value is a reference value for normalizing the heating rate, risk paths in the feedback path are eliminated to obtain candidate paths, and the candidate path corresponding to the minimum first path value is determined to be the first feedback path based on the first path value corresponding to each candidate path.
In one embodiment, calculating based on the first weight, the second weight, the first impedance value, the first heating rate value, the impedance value of the feedback path, and the heating rate, to obtain a first path value corresponding to the feedback path includes:
the method comprises the steps of determining the ratio of the impedance value of the feedback path to a first impedance value as a first impedance ratio, determining the product of the first impedance ratio and a first weight as a second impedance ratio, determining the ratio of the heating rate of the feedback path to a first heating rate value as a first heating ratio, determining the product of the first heating ratio and a second weight as a second heating ratio, and determining the sum of the second impedance ratio and the second heating ratio as a first path value corresponding to the feedback path.
In one embodiment, performing path switching based on the first feedback path and triggering the early warning signal includes:
And under the condition that the impedance value of the main feedback path meets the switching requirement, switching the main feedback path to the first feedback path and triggering an early warning signal.
In one embodiment, the method comprises:
And feeding back reverse electromotive force energy generated in the motor rack testing process to the power grid and the energy storage unit based on the bidirectional inverter.
In a second aspect, the present application provides a motor rack test safety management device, comprising:
the data acquisition module is used for acquiring three-phase current ripple data of energy flow in the feedback path;
The heating positioning module is used for carrying out characteristic analysis based on the three-phase current ripple data and determining abnormal heating source information;
The monitoring module is used for calculating the impedance value and the impedance change rate of each feedback path based on the monitoring data of the feedback paths and determining a risk path, wherein the feedback paths are paths for energy flow from the motor to the power grid and/or the energy storage unit;
the path updating module is used for updating the first feedback path based on the abnormal heating source information and the risk path;
and the path switching module is used for switching the path based on the first feedback path and triggering the early warning signal.
In a third aspect, the present application provides a computing device comprising a memory and a processor;
Wherein one or more computer programs are stored in the memory, the one or more computer programs comprising instructions, which when executed by the processor, cause the computing device to perform the method of any of the first aspects.
In a fourth aspect, the present application provides a computer readable storage medium for storing a computer program for performing the method of any one of the first aspects.
In a fifth aspect, the present application provides a computer program product comprising one or more computer instructions which, when executed by a computer, performs the method of any of the first aspects.
According to the technical scheme, the application has at least the following beneficial effects:
The method comprises the steps of obtaining three-phase current ripple data of energy flow in feedback paths, providing a data basis for data analysis, carrying out feature analysis based on the three-phase current ripple data, determining abnormal heating source information, achieving fault positioning, calculating impedance values and impedance change rates of all feedback paths based on monitoring data of the feedback paths, determining risk paths, laying a foundation for guaranteeing safety of testing, updating a first feedback path based on the abnormal heating source information and the risk paths, providing selection for path switching, carrying out path switching based on the first feedback path, triggering early warning signals, and guaranteeing safety of testing. The method lays a foundation for determining abnormal heating source information by introducing three-phase current ripple data, provides a judgment basis for determining risk performance of each path by introducing impedance values and impedance change rates, provides a choice for path switching by updating the first feedback path, and finally ensures testing safety.
It should be appreciated that the description of technical features, aspects, benefits or similar language in the present application does not imply that all of the features and advantages may be realized with any single embodiment. Conversely, it should be understood that the description of features or advantages is intended to include, in at least one embodiment, the particular features, aspects, or advantages. Therefore, the description of technical features, technical solutions or advantageous effects in this specification does not necessarily refer to the same embodiment. Furthermore, the technical features, technical solutions and advantageous effects described in the present embodiment may also be combined in any appropriate manner. Those of skill in the art will appreciate that an embodiment may be implemented without one or more particular features, aspects, or benefits of a particular embodiment. In other embodiments, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments.
Drawings
Fig. 1 is an application environment diagram of a motor rack test safety management method provided in an embodiment of the present application;
Fig. 2 is a schematic flow chart of a motor rack test safety management method provided in an embodiment of the application;
FIG. 3 is a block diagram of a motor rack test safety management device according to an embodiment of the present application;
fig. 4 is an internal structural diagram of a computer device provided in an embodiment of the application.
Detailed Description
The terms "first," "second," and "third," and the like, in the description and in the drawings, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.
In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.
For clarity and conciseness in the description of the following embodiments, a brief description of the related art will be given first:
The motor is used as a core power source of the new energy automobile, and the performance quality of the motor directly determines the power output, the cruising ability and the running stability of the automobile, so that the accurate evaluation of the motor performance becomes a key link of industrial development. The motor bench test is used as a core means for evaluating the electrical performance, mechanical performance and reliability of the motor, and realizes comprehensive detection of the full life cycle performance of the motor by simulating various actual working conditions such as starting, accelerating and braking of the vehicle.
The conventional motor rack test system still has obvious defects in functional links, is difficult to meet the requirements of safety and high efficiency, can only acquire temperature data of the surface layer of equipment and cannot go deep into the motor if a conventional monitoring means excessively depends on a motor surface temperature sensor in a fault detection layer, so that abnormal heating caused by hidden faults such as poor winding contact and bearing abrasion is difficult to accurately capture, a specific fault point cannot be positioned, the system is often required to be shut down, disassembled and examined, the test progress is seriously dragged, and the system lacks intelligent regulation and control capability in an energy feedback path management layer, cannot monitor path impedance change in real time to predict line aging risk, is not provided with an effective redundancy switching mechanism, and can easily cause the test flow to be forced to be stopped even secondary damage to the equipment when the line impedance is increased to cause unsmooth energy transmission and even interruption.
The motor bench test is used as a key link for evaluating the performance of a motor, and the operation safety of the motor bench test directly influences the accuracy of test data, the continuity of a test flow and the service life of equipment. Therefore, ensuring the safe operation of the motor rack test system in the full test period has become a key problem to be solved urgently in the current motor test technical field.
In order to make the technical scheme of the application clearer and easier to understand, an application scene of the technical scheme of the application is described below with reference to the accompanying drawings. Fig. 1 is a schematic diagram of an application scenario provided in an embodiment of the present application.
In this application scenario, the terminal 102 may collect motor related data in real time, such as a sensor, etc., and the terminal 102 transmits the collected data to the server 104 in real time through a dedicated line or a communication line, so that the server 104 processes and analyzes the data, and returns the analysis result to the terminal 102 for the terminal 102 to be aligned and displayed for viewing by related technicians.
In order to make the technical scheme of the application clearer and easier to understand, the safety management method for testing the motor rack provided by the embodiment of the application is introduced below by combining the application scenes. Fig. 2 is a flowchart of a motor rack test safety management method according to an embodiment of the present application.
S201, three-phase current ripple data of energy flow in the feedback path are obtained.
The energy flow is electric energy flow which is generated around the motor and transmitted between the motor and the bidirectional inverter and the power grid/energy storage unit in the motor rack test, the core source is reverse electromotive energy generated under the working conditions of motor braking and the like, the energy flow has the bidirectional characteristics of energy recovery (flowing to the power grid/energy storage unit) and energy replenishment (flowing to the motor by the energy storage unit), the three-phase current is the current which is transmitted by the energy flow in an alternating current transmission link according to the three-phase alternating current standard and needs to be synchronously monitored to ensure the data integrity, the current ripple is a tiny fluctuation signal which is superimposed on the fundamental wave current in the three-phase current, the characteristics (such as amplitude and frequency) can change along with the motor running state (such as poor contact of windings and abnormal ripple caused by bearing abrasion), the motor health state can be reflected, and the three-phase current ripple data is the original data comprising all fluctuation signals in the three-phase current.
The method is characterized in that after the motor rack test is started, the motor runs to generate reverse electromotive force, energy flows start to be transmitted in a motor-energy feedback closed loop module link, data acquisition can be conducted through high-frequency sampling, for example, the energy flow transmission link (between the motor and the bidirectional inverter) can be connected in series through a hardware interface, the three-phase current transmission channel is directly contacted, complete current signals can be captured, for example, three-phase current in the energy flows is synchronously sampled at high frequency, fluctuation signals (namely current ripple) in each phase of current are captured in real time, and weak ripple characteristics related to missing faults due to too low sampling frequency are avoided.
S202, performing characteristic analysis based on the three-phase current ripple data, and determining abnormal heating source information.
The characteristic analysis is to extract energy distribution characteristics related to motor faults in data, convert original current data into structural information which can be used for fault matching, and can connect the original data with fault positioning, the abnormal heat source information comprises, but is not limited to, abnormal heat source coordinates and heating rate, which refer to specific positions of abnormal heat generated by faults (such as poor winding contact) in the motor, optionally, the abnormal heat source coordinates can be expressed in a three-dimensional coordinate (x, y, z) form, for example, an x-axis generally corresponds to the axial direction of the motor (i.e. the central axis direction of a motor rotor), and is used for positioning the axial position of an abnormal heat source in a plurality of sections along the axial direction of a motor 'front end-rear end', for example, when a motor stator winding is axially divided into a plurality of sections, the x-coordinate can accurately identify which axial section is positioned, for example, is close to the output end of the motor (x-value is larger) or close to a rear end cover (x-value is smaller), a y-axis generally corresponds to the radial position of the motor (i.e. the horizontal direction perpendicular to the central axis of the motor rotor), a y-axis generally corresponds to the radial position of the motor on the inner side-outer side of the motor (i.e. the radial position of the motor rotor is located in a radial direction of the motor) corresponding to the radial direction of the stator winding is larger than the radial direction of the motor winding is located in the radial direction of the particular section (y-value) when the radial direction is located around the rotor is located in the radial direction of the stator winding is larger than the particular section is located around the radial axis (the radial direction of the rotor is) of the rotor is located around the rotor), the z-coordinate may identify which phase group the heat generating source is at the corresponding circumferential angle, such as in the range of 0-120 (phase A windings), 120-240 (phase B windings), or 240-360 (phase C windings).
The method can be realized by performing feature analysis based on three-phase current ripple data to obtain feature vectors, and comparing the feature vectors with fault vectors in a preset fault vector library to determine abnormal heating source information.
The fault vector library is used for storing feature vectors (namely fault vectors) corresponding to various known motor faults (such as winding short circuits and bearing wear), each fault vector is associated with a unique abnormal heating source coordinate and is a reference database for fault comparison, the fault vector is a feature vector corresponding to a specific motor fault, which is stored in the fault vector library, for example, each fault vector can be generated through fitting historical fault data and is bound with the abnormal heating source coordinate corresponding to the fault, and is used for comparing with the real-time feature vector to identify the fault type.
For example, the three-phase current ripple data is characterized by dividing the data by frequency bands and calculating the energy characteristics of each band nodeWill allIntegrating the data into a structured sampling feature vector V E to finish the conversion of the original data to fault identification indexes, such as the energy distribution feature of current ripple, and calculating the firstIndividual band node energy characteristicsThe method comprises the following steps:
wherein, the Numbering frequency bands and,Is the signal characteristic at the i-th sample point in the k-th frequency band,Representing the sample point number in the kth frequency band,For sampling point number, form sampling feature vector。
Further, a sampling feature vector generated in real time can be calculatedMatching degree with each fault vector in preset fault vector libraryIf the calculation formula is: And is also provided with Wherein, the method comprises the steps of,Representing the first of the fault vector librariesThe fault vector library is used for storing the feature vectors under various known fault conditions and is obtained by real-time monitoringIn the comparison of the two types of materials,Representing sampled feature vectorsFor sampling feature vectors, i.e. square root of sum of squares of elements of the feature vectorsThe normalization is carried out so that the data of the data are obtained,Representing fault feature vectorsIs also used for fault feature vectorsThe normalization is carried out so that the data of the data are obtained,Representing a current sampled feature vectorAnd the first in the failure mode libraryFault feature vector corresponding to seed fault modeThe value range of the matching degree is 0-1, and further, the matching degree can be screened outAnd further, according to the successfully matched fault vector, the bound abnormal heating source coordinates (x, y, z) can be called, the temperature rise rate alpha corresponding to the abnormal heating source coordinates (x, y, z) is calculated, and the positioning of the abnormal heating position is completed.
S203, calculating the impedance value and the impedance change rate of each feedback path based on the monitoring data of the feedback paths, and determining the risk path.
The feedback path is a path of energy flow from a motor to a power grid and/or an energy storage unit, namely a transmission channel, is a key line for energy recovery and reutilization in motor rack test, the running state of the key line needs to be monitored in real time to ensure stable energy transmission, the monitored data of the feedback path are real-time running data related to the feedback path, including but not limited to impedance values of the path at different moments, and the like, the impedance values are physical quantities for measuring the current blocking capacity of the path, the current conductivity of the path can be reflected, the larger the impedance values are, the larger the loss in the energy transmission process is, the impedance change rate is an index for measuring the speed of the impedance of the path along with time, the index can be obtained by calculating the ratio of the impedance difference value at different moments to the historical impedance and the time interval, the index can be presented in a percentage mode, the problems of line aging and the like can be early warned, and the risk path can refer to the path which is easy to have problems of poor transmission, increased loss and even interruption and the like in the energy transmission process.
In one implementation, for each feedback path, the feedback path is determined to be a risk path if the impedance value of the feedback path is greater than an impedance reference value and/or the impedance change rate of the feedback path is greater than a change threshold.
The change threshold value may be a critical value for judging whether the change rate of the impedance is abnormal, and when the change rate of the impedance exceeds the change threshold value, the change of the impedance in a short period is fast, and problems such as line aging and poor contact may exist.
The impedance value Z j (t) can be obtained by measuring the impedance of each feedback path at the current moment (t) in real time, and further, the impedance change rate of each feedback path can be calculated based on the monitored impedance values at different moments, wherein the calculation formula is as follows:
wherein, the Represents the firstThe impedance change rate of the feedback path is used for measuring the change speed of the path impedance along with time,Indicating at time t theImpedance value of the strip feedback path, andThe number of the path is given by the number,For the total number of feedback paths,Is shown inTime, the firstImpedance value of the strip feedback path, i.e.The impedance value before the time is set,Representing a time interval.
Further, the impedance value of each feedback path may be compared with the impedance reference value (Z j0), and the impedance change rate may be compared with the change threshold (e.g., 5%), and if any condition of "impedance value > impedance reference value (Z j0)" or "impedance change rate > change threshold (e.g., 5%) is satisfied, the path is determined to be a risk path.
S204, updating the first feedback path based on the abnormal heating source information and the risk path.
The first feedback path may be an optimal energy feedback path selected from candidate paths, and needs to satisfy the condition of "the first path value is minimum", and meanwhile, consider the safety distance between the first feedback path and the abnormal heating source (for example, the distance between the first feedback path and the heating source path is greater than 0.2 m), take the main energy transmission task in the motor test, and ensure the energy to be fed back efficiently and stably.
An implementation mode includes calculating, for each feedback path, a first path value corresponding to the feedback path based on a first weight, a second weight, a first impedance value, a first heating rate value, an impedance value of the feedback path and a heating rate, eliminating risk paths in the feedback path to obtain candidate paths, and determining a candidate path corresponding to a minimum first path value as the first feedback path based on the first path value corresponding to each candidate path.
Wherein the first weight is a weight coefficient corresponding to the impedance value, the second weight is a weight coefficient corresponding to the heating rate, the first impedance value is a reference value for normalizing the impedance value, the first heating rate value is a reference value for normalizing the heating rate, that is, the first weight and the second weight are weight coefficients for calculating the first path value, for example, the first weight can be setAnd a second weightThe first weight corresponds to the impedance related parameter, and the second weight corresponds to the temperature rising rate related parameter, and can be selected fromAndThe optimization logic of the priority path impedance (energy transmission efficiency) and the next attention to the temperature rise change trend is known in the weight distribution mode of (a), wherein the first impedance value and the first temperature rise rate value are normalized reference values when the first path value is calculated, such as setting the first impedance value(I.e. maximum impedance), first temperature rise rate value(Namely, the maximum temperature rise rate can be applied to the normalization of the impedance change rate in an extensible manner, the unification of the calculated dimensions is ensured), the method is used for converting impedance values and the impedance change rates of different orders into a ratio of 0-1 interval, the influence on path value calculation results due to parameter order differences is avoided, a candidate path is a path set remained after a risk path is removed from all feedback paths, and two conditions of a non-risk path and a safety distance from an abnormal heating source (such as a safety distance is greater than 0.2 m) are simultaneously met, so that the method is used for screening a basic range of a first feedback path.
Optionally, a ratio of the impedance value of the feedback path to the first impedance value is determined as a first impedance ratio, a product of the first impedance ratio and the first weight is determined as a second impedance ratio, a ratio of a heating rate of the feedback path to a first heating rate value is determined as a first heating ratio, a product of the first heating ratio and the second weight is determined as a second heating ratio, and a sum of the second impedance ratio and the second heating ratio is determined as a first path value corresponding to the feedback path.
The first impedance ratio can be used for normalizing the impedance value and eliminating the influence of the absolute value difference of the impedance of different paths to ensure that the impedance parameters of different paths have comparability, and the second impedance ratio can represent the weighted contribution of the impedance parameters (namely the first weight) in the first path value, wherein the first weight is the first weightDetermining that the temperature rise rate is dominant in path optimization, normalizing the temperature rise rate by a first temperature rise ratio, unifying parameter calculation dimensions, and reflecting the weighted contribution of the temperature rise rate parameter (namely, a second weight) in the first path value by a second temperature rise ratioThe first path value is an index for measuring the comprehensive performance of the feedback path, and is obtained by adding the second impedance ratio and the second heating ratio, wherein the smaller the value is, the lower the path impedance is, the flatter the impedance change is, and the better the comprehensive performance is.
Exemplary, the temperature rise rate can be based on the impedance value Z j (t) of the jth feedback pathCombining the first weightSecond weightFirst impedance valueA first temperature rise rate valueAccording to the calculation formula'The method comprises the steps of calculating a first path value, further removing a risk path from a path set to ensure the safety of subsequent path selection, further screening paths with the distance from an abnormal heating source path being more than 0.2m to form a candidate path set, further sorting the first path values of all candidate paths, selecting a candidate path with the smallest value as a first feedback path to ensure that a path with the optimal comprehensive performance is selected for energy feedback, namely, the method can be expressed by the following formula:
wherein, the The first feedback path is the optimal path; As a first weight to be used, As a second weight, it can be used to measure the importance of path impedance and rate of temperature rise,A maximum value of the impedance, which is a first impedance value; a first temperature rise rate value, namely a maximum temperature rise rate value; Is a candidate path set; Expressed in candidate path set Is searched for a result thatThe smallest path number.
S205, path switching is performed based on the first feedback path, and an early warning signal is triggered.
The path switching is a switching operation of an energy transmission channel in a motor bench test, and is a process of transferring energy flow from a main feedback path to a first feedback path when the main feedback path cannot work normally, so that energy feedback is not interrupted, the early warning signal is warning information generated before and after the path switching and comprises key contents such as switching reasons (such as exceeding the impedance of the main feedback path), switching path numbers (the main path is the first path), switching time and the like, and is used for reminding an operator of paying attention to the path state and providing a basis for follow-up fault tracing, and the path with the lowest impedance and the temperature rise rate smaller than 3 can be selected as the main feedback channel.
And under the condition that the impedance value of the main feedback path meets the switching requirement, switching the main feedback path to the first feedback path and triggering an early warning signal.
The main feedback path is a main energy feedback path used by default in the motor rack test, bears the transmission task of daily energy flowing from a motor to a power grid and/or an energy storage unit, and the running state of the main feedback path directly influences the whole energy feedback efficiency and the system safety, and the switching requirement is a critical condition for judging that the main feedback path needs to be switched to the first feedback path, if the judgment logic is that the impedance value of the main feedback path is greater than the initial reference impedance value (Z j0), the switching of the path is triggered when the condition is met.
The method comprises the steps of acquiring impedance data of key nodes of a main feedback path in real time to obtain an impedance value of the main feedback path at the current moment, transferring energy flow from the main feedback path to a first feedback path by adjusting the energy transmission direction of a bidirectional inverter when the impedance value of the main feedback path meets the switching requirement, ensuring energy feedback continuity, generating an early warning signal synchronously with path switching operation, and outputting the early warning signal in a mode of a system monitoring interface popup window, an audible and visual alarm, pushing an operator terminal and the like to realize multi-dimensional early warning reminding. Alternatively, the switching requirement may be when the duration of the main feedback path impedance value being greater than the impedance reference value (Z j0) is greater than a time threshold (e.g., 3 minutes, etc.).
According to the application, three-phase current ripple data of energy flow in the feedback path is obtained by high frequency (such as synchronization with motor test working conditions), so that a high-fidelity original signal is provided for subsequent safety analysis. Compared with the traditional system which only collects the surface temperature or macroscopic current data of the motor, the collection mode can capture the internal operation tiny abnormality of the motor (such as current fluctuation caused by poor winding contact and ripple characteristic change caused by bearing abrasion) contained in current ripples, so that the early hidden faults caused by insufficient data collection precision or low frequency omission are avoided, reliable basis is provided for safety early warning and fault diagnosis in a test period from the source, subsequent safety decision deviation caused by data distortion is prevented, and the accuracy of safety analysis is ensured.
The design breaks through the limitation that the traditional system only monitors the surface temperature of the motor and cannot locate internal faults, and can quickly lock the fault position (such as the axial section of the A phase of the stator winding and the radial position of the bearing) in the early stage of abnormal heating caused by internal faults such as poor contact of the winding and abrasion of the bearing, namely, by early recognition of faults and definite fault points, the expansion of faults along with the test progress (such as burning of an insulating layer of the motor and rotor clamping stagnation caused by abnormal heating) can be avoided, the safety accidents such as equipment damage or fire disaster can be effectively prevented, and the physical safety of a motor body and a test bench in the whole test period can be ensured.
Furthermore, by calculating the impedance value and the impedance change rate of each path in real time and judging the risk path by taking the impedance reference value or the change threshold value as the threshold value, the design can identify the problems of ageing, poor contact and the like of the energy feedback path in advance, for example, on one hand, excessive heating caused by overlarge impedance of the risk path is prevented, line burnout or insulation layer melting is avoided, on the other hand, the phenomenon that the energy transmission is blocked due to sudden interruption of the risk path, and then the voltage of a motor end is suddenly increased to damage test equipment is avoided, and the safety and the energy transfer stability of system hardware in a test period are ensured from an energy transmission link.
In addition, the optimal first feedback path is screened through weighted calculation, so that the first feedback path is always in a safe running state with low impedance and low change rate, and loss and fault probability in the energy transmission process are reduced. By constructing the low-risk energy transmission channel, the energy feedback in the test period can be ensured not to be interrupted, the test suspension or equipment damage caused by the path problem is avoided, and the continuity and safety of the test flow are maintained.
And finally, through introducing loop switching, double support of redundancy guarantee and emergency reminding is provided for safe operation of the test period, on one hand, a path switching function avoids energy transmission interruption after a main feedback path fails, prevents an overvoltage damage caused by incapability of releasing energy of a motor, simultaneously ensures that a test flow is not interrupted, ensures that tasks in the test period are completed according to a plan, and on the other hand, an early warning signal can inform operators of the failure type (such as exceeding the impedance) of the main path and the running state of the first path in real time, so that the operators can conveniently and timely overhaul the failure path, avoid failure accumulation expansion (such as overheat propagation of the main path to other parts), form closed-loop safety control of failure response-flow continuity-personnel intervention, and comprehensively ensure stable, continuous and safe operation of a system in the test period.
The motor rack test safety management method comprises the steps of obtaining three-phase current ripple data of energy flow in feedback paths, providing a data basis for data analysis, carrying out feature analysis based on the three-phase current ripple data, determining abnormal heating source information, achieving fault positioning, calculating impedance values and impedance change rates of all feedback paths based on monitoring data of the feedback paths, determining a risk path, laying a foundation for guaranteeing test safety, updating a first feedback path based on the abnormal heating source information and the risk path, providing selection for path switching, carrying out path switching based on the first feedback path, triggering an early warning signal and guaranteeing test safety. The method lays a foundation for determining abnormal heating source information by introducing three-phase current ripple data, provides a judgment basis for determining risk performance of each path by introducing impedance values and impedance change rates, provides a choice for path switching by updating the first feedback path, and finally ensures testing safety.
The embodiment of the application relates to a process for energy recovery based on the embodiment, which specifically comprises the following steps:
And feeding back reverse electromotive force energy generated in the motor rack testing process to the power grid and the energy storage unit based on the bidirectional inverter.
The bidirectional inverter is core power electronic equipment for realizing bidirectional energy flow in a motor rack test safety management system, can convert electric energy of a power grid/energy storage unit into alternating current (driving mode) required by motor test, can convert reverse electromotive force energy generated by a motor into alternating current (feedback mode) with the same frequency and the same voltage as a power grid after rectification into direct current, is a key conversion node of an energy feedback path, the motor rack test is a process of detecting indexes such as motor performance, reliability and safety on a special test rack, the motor possibly generates reverse electromotive force due to working condition change (such as deceleration and braking) in the test, the part of energy needs to be processed through an energy feedback system, so that energy waste or equipment damage is avoided, the reverse electromotive force energy is energy corresponding to electromotive force generated by cutting a magnetic induction wire by a stator winding by rotor inertia in a non-driving state (such as deceleration and braking stage) of the motor, if the energy is not processed timely, the voltage of a motor end is possibly increased, the test equipment is damaged, the motor end is required to be utilized by the system, the power grid test is connected with the public potential energy, the power grid is connected with the power grid, the feedback system is required to be stored in a standby power grid, the power grid is required to be matched with a power grid, the energy storage capacitor is required to be stored when the power grid is in a standby capacitor, the power grid has high phase, the energy storage capacitor is required to be stored, and the energy is required to be stored in a standby capacitor is stored, the energy recycling is realized, and the energy efficiency of the system is improved.
The energy conversion function of the bidirectional inverter is used for rectifying reverse electromotive force energy (alternating current) generated by the motor into direct current, and then inverting the direct current into alternating current meeting the power grid requirement according to the power grid state and the charge state of the energy storage unit to feed back the alternating current to the power grid, or directly storing the direct current into the energy storage unit, so that core actions of energy recovery and reuse are completed, and the actions are key for realizing energy conservation and guaranteeing test safety.
It should be noted that, the bidirectional inverter can realize efficient conversion and recovery of reverse electromotive energy, rectify and invert the energy which is wasted, precisely match the parameters of the power grid (such as within the threshold of +/-5% of the voltage and synchronous frequency), and feed back the energy to the power grid, or adapt the voltage requirement of the energy storage unit and store the energy to the energy storage unit. The process can improve the recovery rate of reverse electromotive force energy in the test process, and reduce energy waste; meanwhile, the energy stored by the energy storage unit can be released again in the motor test driving stage to supply power to the motor, so that the dependence on an external power grid is reduced, the energy utilization efficiency of the whole test system is improved, and the electricity consumption cost and carbon emission of enterprises are indirectly reduced; the energy feedback function of the bidirectional inverter can directly transfer reverse electromotive force energy, avoid energy accumulation and heat release on a resistor, reduce the working temperature of key elements (such as a resistor and a motor controller) of the system, reduce equipment loss caused by high temperature, monitor voltage and current parameters in real time in the energy conversion process, avoid impact on a motor, a power grid and an energy storage unit caused by overhigh reverse electromotive force, further reduce equipment failure risk, prolong the whole service life of the system, further, the bidirectional inverter can track the phase of the power grid in real time through a built-in phase locking module, control the phase difference of the feedback electric energy in a controllable range, control harmonic content, avoid impact on the power grid, ensure the running stability of the power grid, dynamically adjust the energy feedback proportion according to the real-time state (such as load rate and voltage fluctuation) of the power grid, for example, store the energy to the energy storage unit in an automatic priority mode when the load rate of the power grid is more than 70%, avoid the power grid overload, pause the power grid feedback when the voltage fluctuation of the power grid exceeds a threshold value of +/-5%, switch to the energy storage unit, prevent the power grid from being stopped due to the power grid failure, and finally prevent the power grid from being tested by the power grid from being stopped, the bidirectional inverter has the capacity of bidirectionally converting electric energy, can feed back reverse electromotive force energy to a power grid and an energy storage unit, can invert the electric energy of the power grid or the energy storage unit into alternating current required by the motor in a motor test driving stage, realizes closed-loop management of energy recovery, storage and reuse, enables a system to be flexibly adapted to different test working conditions, efficiently recovers the reverse electromotive force energy when the motor is in braking test, calls the energy of the power grid or the energy storage unit as required when the motor is in starting and loading test, does not need to be additionally provided with an independent driving power supply, simplifies the system structure, simultaneously supports docking with different types of energy storage units (such as a lithium battery pack and a super capacitor), automatically adapts to rated voltage of the energy storage unit, can select different energy storage schemes according to test scene requirements (such as short-term high-frequency test and long-term endurance test), and enhances the suitability of the system to diversified test requirements.
In the embodiment of the application, a way is provided for realizing energy recovery by introducing the bidirectional inverter, and finally, the high-efficiency conversion and recovery of energy are realized.
The motor rack test safety management method provided by the embodiment of the application is described in detail above with reference to fig. 1 to 2, and the device and equipment provided by the embodiment of the application are described below with reference to the accompanying drawings.
As shown in fig. 3, the schematic diagram of a motor rack test safety management device 600 according to an embodiment of the present application, the motor rack test safety management device 600 includes a data acquisition module 601, a heating positioning module 602, a monitoring module 603, a path updating module 604, and a path switching module 605, wherein:
the data acquisition module 601 is configured to acquire three-phase current ripple data of an energy flow in the feedback path;
the heating positioning module 602 is used for performing feature analysis based on the three-phase current ripple data and determining abnormal heating source information;
The monitoring module 603 is configured to calculate an impedance value and an impedance change rate of each feedback path based on the monitoring data of the feedback paths, and determine a risk path, where the feedback paths are paths of energy flows from the motor to the power grid and/or the energy storage unit;
A path updating module 604, configured to update the first feedback path based on the abnormal heat source information and the risk path;
the path switching module 605 is configured to perform path switching based on the first feedback path, and trigger an early warning signal.
In one embodiment, the heat generation positioning module 602 is specifically configured to:
and comparing the characteristic vector with a fault vector in a preset fault vector library to determine abnormal heating source information.
In one embodiment, the monitoring module 603 is specifically configured to:
For each feedback path, determining the feedback path as a risk path when the impedance value of the feedback path is greater than an impedance reference value and/or the impedance change rate of the feedback path is greater than a change threshold.
In one embodiment, the path update module 604 is specifically configured to:
And calculating based on the first weight, the second weight, the first impedance value, the first heating rate value, the impedance value of the feedback path and the heating rate to obtain a first path value corresponding to the feedback path, wherein the first weight is a weighting coefficient corresponding to the impedance value, the second weight is a weighting coefficient corresponding to the heating rate, the first impedance value is a reference value for normalizing the impedance value, the first heating rate value is a reference value for normalizing the heating rate, risk paths in the feedback path are eliminated to obtain candidate paths, and the candidate path corresponding to the minimum first path value is determined to be the first feedback path based on the first path value corresponding to each candidate path.
In one embodiment, the path update module 604 is specifically configured to:
the method comprises the steps of determining the ratio of the impedance value of the feedback path to a first impedance value as a first impedance ratio, determining the product of the first impedance ratio and a first weight as a second impedance ratio, determining the ratio of the heating rate of the feedback path to a first heating rate value as a first heating ratio, determining the product of the first heating ratio and a second weight as a second heating ratio, and determining the sum of the second impedance ratio and the second heating ratio as a first path value corresponding to the feedback path.
In one embodiment, the path switching module 605 is specifically configured to:
And under the condition that the impedance value of the main feedback path meets the switching requirement, switching the main feedback path to the first feedback path and triggering an early warning signal.
In one embodiment, the motor rack test safety management device 600 further includes:
And the energy feedback module is used for feeding back reverse electromotive energy generated in the motor rack testing process to the power grid and the energy storage unit based on the bidirectional inverter.
The motor rack test safety management device 600 according to the embodiment of the present application may correspond to performing the method described in the embodiment of the present application, and the above other operations and/or functions of each module/unit of the motor rack test safety management device 600 are respectively for implementing the corresponding flow of each method in the embodiment shown in fig. 2, and are not repeated herein for brevity.
The embodiment of the application also provides a computing device. The computing device may be a local computing device or an application server.
As shown in fig. 4, which is a schematic diagram of a computing device according to an embodiment of the present application, the computing device 700 includes a bus 701, a processor 702, a communication interface 703, and a memory 704. Communication between processor 702, memory 704 and communication interface 703 is via bus 701.
Bus 701 may be a peripheral component interconnect standard (PERIPHERAL COMPONENT INTERCONNECT, PCI) bus or an extended industry standard architecture (extended industry standard architecture, EISA) bus, or the like. The buses may be divided into address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 4, but not only one bus or one type of bus.
The processor 702 may be any one or more of a central processing unit (central processing unit, CPU), a graphics processor (graphics processing unit, GPU), a Microprocessor (MP), or a digital signal processor (DIGITAL SIGNAL processor, DSP).
The communication interface 703 is used for communication with the outside. For example, the communication interface 703 may be used to communicate with the terminal 102. The communication interface 703 is used for sending an early warning signal to the terminal 102, so that the terminal 102 presents the display early warning signal.
The memory 704 may include volatile memory (RAM), such as random access memory (random access memory). The memory 704 may also include a non-volatile memory (non-volatile memory), such as read-only memory (ROM), flash memory, a hard disk drive (HARD DISK DRIVE, HDD) or a solid state drive (SSD STATE DRIVE).
The memory 704 has stored therein executable code that the processor 702 executes to perform the aforementioned motor rack test safety management method.
In particular, in the case where the embodiment shown in fig. 3 is implemented, and each module or unit of the motor rack test safety management apparatus described in the embodiment of fig. 3 is implemented by software, software or program codes required to perform the functions of each module/unit in fig. 3 may be partially or entirely stored in the memory 704. The processor 702 executes program codes corresponding to the respective units stored in the memory 704, and performs the aforementioned motor rack test safety management method.
The embodiment of the application also provides a computer readable storage medium. The computer readable storage medium may be any available medium that can be stored by a computing device or a data storage device such as a data center containing one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk), etc. The computer-readable storage medium includes instructions that instruct a computing device to perform the motor rack test safety management method described above.
Embodiments of the present application also provide a computer program product comprising one or more computer instructions. When the computer instructions are loaded and executed on a computing device, the processes or functions in accordance with embodiments of the present application are fully or partially developed.
The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, or data center to another website, computer, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line), or wireless (e.g., infrared, wireless, microwave, etc.).
The computer program product, when executed by a computer, performs any of the methods of motor rack test safety management methods described previously. The computer program product may be a software installation package which may be downloaded and executed on a computer in the event that any of the methods of motor rack test safety management described above is required.
The descriptions of the processes or structures corresponding to the drawings have emphasis, and the descriptions of other processes or structures may be referred to for the parts of a certain process or structure that are not described in detail.
The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application.
Claims (10)
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