RU187429U1 - Power supply control device for the energy district with distributed generation sources during a short circuit in the section of the reserved line - Google Patents

Abstract

The utility model relates to the automation of electric networks and can be used to ensure reliable power supply to consumers of the industrial energy district with sources of distributed generation. The required technical result, which consists in expanding the functionality and increasing the reliability of uninterrupted power supply to the industrial energy district, is achieved in a device containing a voltage trigger, a frequency trigger, an OR element, the first and second AND elements, the outputs of which are connected, respectively, with the first and the second inputs of the OR element, the unit for determining the settings of the starting organs and the memory block of the optimal options for automatic input of the reserve, the output of which is connected to the input of the block the distribution of the settings of the starting organs, while the first and second outputs of the unit for determining the settings of the starting organs are connected to the first inputs, respectively, of the first and second elements And, the third and fourth outputs of the unit for determining the settings of the starting organs are connected, respectively, to the first input of the starting body for voltage and with the first input of the starting body in frequency, made with the possibility of applying to their second inputs of the signal from the voltage sensor of the reserved line, and the outputs of the starting body in voltage and starting body in frequency are connected to the second inputs, respectively, of the first and second elements I. 8 ill.

Description

The utility model relates to the automation of electric networks and can be used to ensure reliable power supply to consumers of the industrial energy district with sources of distributed generation.

A known unit for automatically turning on the power supply reserve of devices [RU No. 111364, H02J 9/06, Н02В 1/00, 09/14/2011], which contains inputs of feeders for power supply, internal protection devices against impulse and switching interference and overvoltage are connected to each of them, which connected with power quality control devices for each power supply input and input switching device, with a circuit of control logic for switching power supply inputs, which, in turn, controls the operation of the switching device for input ele power supply, a block status indication circuitry that is connected to a device for transmitting diagnostic information to supervisory control systems.

The disadvantage of this device is the relatively narrow functionality, since the known device is intended only to organize the power supply of low-voltage consumers of electricity from single-phase AC sources.

The closest in technical essence to the proposed is a device for automatically turning on the backup power supply to consumers [RU 2447565, C1, H02J 9/06, 04/10/2012], containing input switches of the main and backup power sources, a section switch, voltage transformers on the buses of the main and backup sources , current transformers at the inputs of the main and backup sources, analog-to-digital current and voltage converters, blocks for determining the minimum input current of each section, high-speed starts e device, the output of which is connected through the control unit to the input and section switches, moreover, the high-speed starting device is additionally equipped with a unit for generating linear voltages of the main and standby sources and a unit for determining the direction of power in the phases of input of the main and standby sources, three inputs of the unit for generating linear voltages of the main the source is connected to the corresponding outputs of the analog-to-digital voltage converters on the buses of the main source, and the fourth input is dinene with the corresponding output of the unit for forming the linear voltage of the backup source, and the outputs are connected to the three corresponding inputs of the unit for determining the direction of power in the phases of the main source and the input of the unit for forming the linear voltage of the backup source, the three inputs of the unit for forming the linear voltage of the backup source are connected to the corresponding outputs of analog-digital voltage converters on the buses of the backup source, and the outputs are connected to the three corresponding inputs of the determination unit power directions in the phases of the backup source, the three inputs of the power direction determining unit in the phases of the main source are connected to the corresponding outputs of the analog-to-digital current converters of the main source, and the three outputs are connected to the corresponding inputs of the three logical elements “AND” of the main source, and the other three outputs are connected with three corresponding inputs of logical elements “AND” of the backup source, the three inputs of the unit for determining the direction of power in the phases of the backup source are connected to the existing outputs of the analog-to-digital current converters of the backup source, and the three outputs are connected to the corresponding inputs of the three logical elements “AND” of the backup source, and the other three outputs are connected to the three corresponding inputs of the logical elements “AND” of the main source, the outputs of the three logical elements “AND” the main source connected to the three inputs of the first logical element "OR" of the main source, and the outputs are connected to the corresponding input of the second logical element "OR" of the main source, the outputs of the three logical elements "AND", the backup source is connected to the three inputs of the first logical element "OR" of the backup source, and the outputs are connected to the corresponding input of the second logic element "OR" of the backup source, the input of the unit for determining the minimum input current of the main source is connected with the corresponding outputs analog-digital current converters of the main source, and one output is connected to the input of the fourth logical element "AND" of the main source, and the second output is connected to the corresponding the input of the fourth logical element "AND" of the backup source, the input of the unit for determining the minimum input current of the backup source is connected to the corresponding outputs of the analog-to-digital converters of current of the backup source, and one output is connected to the input of the fourth logical element "AND" of the backup source, and the second output is connected to the corresponding input of the fourth logical element "AND" of the main source, the second input of the second logical element "OR" of the main source is connected to the corresponding output of the four of the logical element "AND" of the main source, and the output is connected to the corresponding input of the fifth logical element "AND" of the main source, the second input of the second logical element "OR" of the backup source is connected to the corresponding output of the fourth logical element "AND" of the backup source, and the output is connected with the corresponding input of the fifth logical element "AND" of the backup source, blocking signals from the relay protection are fed to the second input of the fifth logical element "AND" of the main and backup source, and the output q is connected to the inputs of the control unit.

The disadvantage of this device is the relatively narrow functionality, since although it is designed to automatically turn on the backup power supply of consumers, it does not allow controlling the power supply of the energy district with distributed generation sources during a short circuit in the section of the reserved line. This narrows the arsenal of technical tools that allow you to manage the power supply of the energy district.

The problem, which is solved in a utility model, is to create a device with wider functionality and expanding the arsenal of technical means that can be used to control the power supply of an industrial energy district with distributed generation sources during possible short circuits on sections of redundant lines, and providing reliable network automatic input of the reserve of the industrial energy district with sources of distributed generation, ensuring its triggering vanie short-circuit at the site redundant line.

The required technical result consists in expanding the functionality and expanding, on this basis, an arsenal of technical means that can be used to control the power supply of the industrial energy district with sources of distributed generation with possible short circuits on sections of redundant lines, and increase the reliability of uninterrupted power supply of the industrial energy district with sources distributed generation with possible short circuits in the section of the reserved line.

The problem is solved, and the required technical result is achieved by the fact that, in a device containing a trigger element for voltage, a trigger element for frequency, as well as an OR element and the first and second elements AND, the outputs of which are connected, respectively, with the first and second inputs of the element OR, according to the utility model, a unit for determining the settings of the starting organs is introduced, configured to supply voltage signals in the nodes and currents in the branches of the energy district to its group of signal inputs and te-signaling signals the positioning of the sectionalizing switches of the redundant line, and the memory block of the optimal options for automatic input of the reserve, the output of which is connected to the input of the block for determining the settings of the starting organs, while the first and second outputs of the block for determining the settings of the starting organs are connected to the first inputs, respectively, of the first and second elements , the third and fourth outputs of the unit for determining the settings of the starting organs are connected, respectively, with the first input of the starting body for voltage and with the first input of the starting body for one hour the totem made with the possibility of supplying to their second inputs a signal from the voltage sensor of the redundant line, and the outputs of the starting voltage element and the starting frequency element are connected to the second inputs of the first and second elements I.

The drawing shows:

in FIG. 1 is an electrical block diagram of a power supply control device for an energy district with distributed generation sources during a short circuit in a section of a redundant line, together with an example of a design scheme for automatically switching on a reserve when power is supplied to an energy district with distributed generation sources.

in FIG. 2 - illustration of the circuit-operational conditions for the operation of the ATS during emergency voltage reduction;

in FIG. 3-8 are examples of transients for all emergency zones shown in FIG. 2. (the figures correspond to the following parameters: Fig. 3 - region Al, d = 60%, p = 30%; Fig. 4 - region A2, d = 60%, p = 50%; Fig. 5 - region C1, d = 0, p = 100%; Fig. 6 - region C2, d = 20%, p = 70%; Fig. 7 - region C3, point C3 ₁ , d = 60%, p = 70%; Fig. 8 - region C3, point C3 ₂ , d = 0%, p = 30%);

In FIG. 1 marked:

1 - block determining the settings of the launching bodies;

2 - voltage sensor of the reserved line;

3 - starting voltage element:

4 - trigger body in frequency;

5 - the first 5 ₁ and the second 5 ₂ elements And;

6 - element OR,

7 - memory block optimal options for automatic reserve input;

8 - block automatic input reserve (ABP);

9 - asynchronous motors (HELL);

10 - generating installations (PG);

11 - resistor (R);

12 - switch B1;

13 - switch B2;

14 - switch B3;

15-16 - tires of "infinite power" (BWM).

The power supply control device for the energy district with distributed generation sources during a short circuit in the section of the reserved line contains a trigger element 3 in voltage, a trigger element 4 in frequency, and also an OR element 6 and the first 5 ₁ and second 5 ₂ And elements, the outputs of which are connected, respectively, with the first and second inputs of the element OR 6.

The control device for power supply of the energy district with distributed generation sources during a short circuit in the section of the reserved line also contains a unit 1 for determining the settings of the starting organs, configured to supply voltage signal nodes and currents in the branches of the energy district to its group of signal signals and position signals sectioning switches of the redundant line, and the memory unit 7 of the optimal options for automatic input of the reserve, the output of which is connected to the input b Lock 1 determine the settings of the starting bodies.

In the device, the first and second outputs of the block 1 for determining the settings of the trigger elements are connected to the first inputs, respectively, of the first 5 ₁ and second 5 ₂ elements And, the third and fourth outputs of the block 1 for determining the settings of the trigger bodies are connected, respectively, with the first input of the trigger 3 voltage and with the first input of the starting body 4 in frequency, made with the possibility of applying to their second inputs a signal from the sensor 2 voltage of the reserved line, and the outputs of the starting body 3 in voltage and the starting body 4 in frequency are connected with second inputs, respectively, of the first 5 ₁ and second 5 ₂ elements I.

In addition, in the device, the outputs of the first 5 ₁ and second 5 ₂ elements AND through the element OR 6 are connected to the control input of the switch, which ensures the operation of the network ABP.

Here are examples of the joint and separate application of the trigger elements for voltage and frequency in various circuit-operating conditions of the industrial energy district (see Fig. 2):

- in the area A1 - the normal operation of the ATS is ensured - only the starting voltage element is used;

- in the area A2 - an increase in the response time of the ATS is recorded - only the starting voltage element is used, but with control of the permissible duration of the voltage reduction (time setting);

- in the area C1 - a slight decrease in voltage and frequency is recorded, which are higher than critical values - trigger elements for voltage and frequency are used together (one group of settings for voltage and frequency);

- in the area C2 - an insignificant decrease in voltage is recorded, which is limited by the permissible duration of forcing the excitation of the PG, and a significant decrease in frequency - the trigger organs for voltage and frequency are used together (another group of settings for voltage and frequency);

- in the area C3 - a deep voltage drop is recorded - a voltage trigger is used to control the position of the sectionalizing switches on the redundant line, ensuring the automatic transfer switch trips without a time delay.

The control device for power supply of the energy district with sources of distributed generation during a short circuit in the section of the redundant line works as follows.

Preliminarily, calculations or simulation are performed to determine the options for the operation of the ATS in various (normal and emergency) modes of operation of the energy district with sources of distributed generation and a reserved line. The results of preliminary calculations or simulation are entered into the memory unit 7 for the subsequent selection of the optimal option for the operation of the ATS in a particular emergency operation of the energy district with sources of distributed generation and a reserved line.

To monitor the current operating mode of the energy district and the reserved line, block 1 provides information on currents in the branches and voltages in the nodes of the energy district. Additionally, it receives data on the positions of the switching devices of the power supply system of the energy district and the redundant line, which determine the status (“off” / “in operation”) of the electrical equipment (distributed generation sources, power lines, transformers, consumer electric receivers, etc.). At each moment in time, based on the input information, block 1 determines the current operating mode of the energy district. Based on the current operating mode of the energy district, block 1 uses the information stored in memory block 7 for a similar (or close to that) circuit-mode situation, and for which the optimal ATS options are calculated or obtained as a result of preliminary calculations or simulation modeling, which makes it possible to determine the best the current settings, which from block 1 are supplied to the first inputs of the starting organs by voltage 3 and by frequency 4. To the second inputs of the starting organs 3, 4 from the voltage measurement circuits of the energy district through a 2 n sensor information receives the information necessary for their functioning. In the starting organ, at a frequency of 4, based on, for example, instantaneous voltage values, the frequency of the energy district required for the operation of the ATS is determined. When current values of the voltage and frequency exceed the set values of the starting elements, control signals are generated at their outputs, which are fed to the second inputs of the elements And 5 ₁ and 5 ₂ .

Similarly, if a section of the redundant line is damaged and disconnected (an emergency occurs), information about the disconnection of the sectioning switch (s) is fed to the telesignal input of unit 1 and, after determining the optimal settings for the corresponding circuit-mode situation, the output control signals of the starting organs 3, 4 of the ATS are activated. In this case, the first inputs of the elements And 5 ₁ and 5 ₂ from block 1 receive signals intended for the implementation of the joint or separate functioning of the starting organs 3, 4 in voltage and frequency, and the element OR 6 transmits control signals from the elements And 5 ₁ and 5 ₂ on the switch providing operation of network automatic transfer switch.

Thus, according to preliminary calculations or simulation, as well as analysis of the current mode of operation of the energy district, the power supply of the industrial energy district with distributed generation sources is controlled, including in emergency situations when a short circuit occurs on the section of the reserved line, which ensures the achievement of the required technical result, which consists in in expanding the functionality and expanding, on this basis, an arsenal of technical means that can They can be used to control the power supply of the industrial energy district with sources of distributed generation in case of possible short circuits on the sections of redundant lines, and increase the reliability of uninterrupted power supply of the industrial energy district.

Claims (1)

A power supply control device for an energy district with distributed generation sources during a short circuit in a section of a reserved line, containing a voltage trigger, a frequency trigger, and also an OR element and first and second AND elements, the outputs of which are connected, respectively, with the first and second inputs of the element OR, characterized in that a block for determining the settings of the starting organs is introduced, configured to supply voltage signals in nodes and currents in the branches of the energy burner to its group of signal inputs it and to its input of the signaling signal of the position of the sectionalizing switches of the redundant line, and the memory block of the optimal options for automatic input of the reserve, the output of which is connected to the input of the block for determining the settings of the starting organs, while the first and second outputs of the block for determining the settings of the starting organs are connected to the first inputs respectively, of the first and second elements And, the third and fourth outputs of the block for determining the settings of the starting bodies are connected, respectively, with the first input of the starting body for voltage eniyu and the first input of the trigger body at a frequency adapted to supply a signal at their second inputs of redundant line voltage sensor, and outputs the trigger body voltage and frequency starting body are connected to second inputs, respectively, first and second elements I.

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