Capacitor reactive compensation control system

Abstract

The utility model relates to a capacitor reactive compensation control system, which can work only when the current in a power grid is unstable through a current transformer and a resistor in a current detection module, so that only an abnormal current signal is transmitted to a control chip, the calculated amount of the control chip is reduced, and the service life of the control chip is prolonged; and according to an overvoltage comparison circuit arranged in the voltage detection module, the abnormal state of the voltage signal can be detected and transmitted to the control chip, and finally the reactive compensation of the capacitor is realized. The circuit breaker is arranged between the compensation capacitor and the switching capacitor switch in the reactive power compensation module, and the reactive power compensator controls the circuit breaker and the switching capacitor switch, so that connection and disconnection of the compensation capacitor can be controlled; and the breaker can effectively reduce the influence of electric arc generated when the compensation capacitor is switched on and switched off on itself and the circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of reactive power compensation, in particular to a capacitor reactive power compensation control system. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] With the continuous advancement and development of electronics, network communications, and power grids, capacitor reactive power compensation plays an increasingly irreplaceable role in equipment and power grid operation, becoming a crucial measure for ensuring stable power system operation. Capacitor reactive power compensation improves the power factor of the power grid, increases energy utilization, reduces line losses, and enhances power quality.

[0004] Existing capacitor reactive power compensation systems require real-time transmission of monitored grid current and voltage signals to a controller to determine whether overvoltage, undervoltage, or current differentials are occurring. This increases the workload of the controller itself and shortens the lifespan of components such as the controller. Furthermore, during capacitor reactive power compensation, arcing occurs when the capacitor is connected and disconnected, damaging the capacitor itself and causing circuit failures, rendering reactive power compensation impossible. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a capacitor reactive power compensation control system, which processes the current signal through a set current transformer and realizes that only the abnormal state signal is transmitted to the control chip, thereby reducing the processing load of the control chip and extending the service life of the control chip; and according to the arrangement of a circuit breaker between the compensation capacitor and the switching capacitor switch, and controls it through the reactive power compensator, thereby providing double protection for the compensation capacitor, which can effectively avoid the influence of the arc generated when the compensation capacitor is connected and closed on the compensation capacitor and the circuit.

[0006] The purpose of the utility model is to provide a capacitor reactive power compensation control system, comprising a control chip, a current detection module, a voltage detection module and a reactive power compensation module, wherein the current detection module, the voltage detection module and the reactive power compensation module are all electrically connected to the control chip;

[0007] The current detection module includes a current acquisition circuit, a first filtering circuit, a current transformer and a resistor, wherein the current acquisition circuit, the first filtering circuit, the current transformer and the resistor are electrically connected in sequence, and the resistor is electrically connected to the control chip;

[0008] The voltage detection module includes a voltage acquisition circuit, a second filtering circuit and an overvoltage comparison circuit, wherein the voltage acquisition circuit, the second filtering circuit and the overvoltage comparison circuit are electrically connected in sequence, and the overvoltage comparison circuit is electrically connected to the control chip;

[0009] The reactive compensation module includes a switching capacitor switch, a circuit breaker, a compensation capacitor and a reactive compensation controller. The switching capacitor switch, the circuit breaker and the compensation capacitor are electrically connected in sequence. The switching capacitor switch is electrically connected to the control chip. The reactive compensation controller is connected to the switching capacitor switch and the circuit breaker.

[0010] As a further technical solution, the control chip is an STM32 single-chip microcomputer.

[0011] As a further technical solution, the model of the reactive power compensation controller is VICMT-S13C.

[0012] As a further technical solution, the reactive power compensation module further includes a zero-crossing detection circuit, and the zero-crossing detection circuit is electrically connected to the control chip.

[0013] As a further technical solution, the control system further includes a reset circuit, which is electrically connected to the control chip.

[0014] As a further technical solution, the control system further includes a power supply, which is electrically connected to the control chip.

[0015] As a further technical solution, the control system further includes a temperature and humidity sensing module, which is electrically connected to the control chip.

[0016] As a further technical solution, the control system further includes a communication control module and a monitoring background, the communication control module is electrically connected to the monitoring background, and the communication control module is electrically connected to the control chip.

[0017] As a further technical solution, the control system further includes a storage module, and the storage module is electrically connected to the control chip.

[0018] As a further technical solution, the control system further includes a display module, and the display module is electrically connected to the control chip.

[0019] Beneficial effects of one or more of the above technical solutions:

[0020] (1) This embodiment can convert the current signal into a voltage signal through the current transformer provided in the current detection module. At the same time, it can work only when the current in the power grid is unstable, so that only the abnormal signal in the current is transmitted to the control chip, thereby reducing the processing load of the control chip and extending the service life of the control chip; and according to the overvoltage comparison circuit provided in the voltage detection module, it can also detect the abnormal state of the voltage signal and transmit it to the control chip, ultimately realizing capacitor reactive power compensation.

[0021] (2) This embodiment provides a circuit breaker between the compensation capacitor and the capacitor switching switch in the reactive compensation module, and controls the circuit breaker and the capacitor switching switch through the reactive compensator, thereby controlling the connection and disconnection of the compensation capacitor. In addition, the circuit breaker can effectively reduce the impact of the arc generated when the compensation capacitor is connected and disconnected on itself and the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings in the specification that constitute part of this application are used to provide further understanding of this application. In order to facilitate understanding, the proportions between the structures of each part have been adjusted. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute a limitation on this application.

[0023] Figure 1 This is a principle block diagram of a capacitor reactive power compensation control system of the utility model.

[0024] Figure 2 The utility model is a structural diagram of an overvoltage comparison circuit in a capacitor reactive power compensation control system.

[0025] Figure 3 This is a schematic diagram of a current transformer in a capacitor reactive power compensation control system of the utility model.

[0026] Among them, 1. control chip, 2. current acquisition circuit, 3. first filter circuit, 4. current transformer, 5. resistor, 6. voltage acquisition circuit, 7. second filter circuit, 8. overvoltage comparison circuit, 9. capacitor switching, 10. circuit breaker, 11. compensation capacitor, 12. reactive power compensation controller, 13. reset circuit, 14. power supply, 15. temperature and humidity sensor module, 16. display module, 17. storage module, 18. communication control module, 19. monitoring background, 20. zero-crossing detection circuit. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-3 , clearly and completely describe the technical solutions in the embodiments of the present utility model.

[0028] Example 1

[0029] Reference Figure 1 A capacitor reactive power compensation control system includes a control chip 1, a current detection module, a voltage detection module, and a reactive power compensation module; wherein the current detection module, the voltage detection module, and the reactive power compensation module are all electrically connected to the control chip 1. The control chip 1 is an STM32 single-chip microcomputer.

[0030] The current detection module includes a current acquisition circuit 2, a first filtering circuit 3, a current transformer 4, and a resistor 5. Specifically, the current acquisition circuit 2, the first filtering circuit 3, the current transformer 4, and the resistor 5 are electrically connected in sequence, and the resistor 5 is electrically connected to the control chip 1.

[0031] The voltage detection module includes a voltage acquisition circuit 6, a second filter circuit 7 and an overvoltage comparison circuit 8. Specifically, the voltage acquisition circuit 6, the second filter circuit 7 and the overvoltage comparison circuit 8 are electrically connected in sequence, and the overvoltage comparison circuit 8 is electrically connected to the control chip 1.

[0032] In this embodiment, current acquisition circuit 2 is a conventional three-phase current acquisition circuit, and voltage acquisition circuit 6 is a conventional three-phase voltage acquisition circuit. Current acquisition circuit 2 and voltage acquisition circuit 6 are respectively used to acquire current and voltage signals from the power grid. First filter circuit 3 and second filter circuit 7 are conventional filter circuits, which filter the acquired current and voltage signals to ensure their integrity.

[0033] Reference Figure 2 The collected voltage signal is transmitted through V in terminal input, and V ref Then connect the reference voltage for comparison, compare the voltage through transistors Q2 and Q3, and adjust the conduction state of Q1 to achieve V out By regulating, abnormal voltage signals can be effectively identified and all signals are transmitted to the control chip 1 for subsequent reactive power compensation. in Greater than the reference voltage V ref When V out Output high level; when input voltage V in Less than the reference voltage V ref When V out Output low level and V out The output signal is transmitted to the control chip 1. At the same time, other voltage comparison circuits can also be used for comparison.

[0034] Reference Figure 3 During the use of the current transformer 4, the filtered current signal passes through I in Enter from I out output terminal, and through the Iout The electrically connected resistor 5 can convert the current signal into a voltage signal. At the same time, when the power grid is in normal operation or outputting rated load, there is no current in the current transformer 4, that is, the current transformer 4 does not work. At this time, the resistor 5 is approximately 0, so that the input signal received by the control chip 1 is lower than the rated voltage, that is, the control chip 1 cannot receive the signal at this time, which is equivalent to the current acquisition circuit 2 not working. When the current signal in the power grid is abnormal, the current signal will be converted into a voltage signal and transmitted to the control chip 1, and the subsequent reactive power compensation process will be carried out. At the same time Figure 3 The intermediate resistor is used to adjust the internal resistance of the current transformer 4, thereby adjusting the amplification or reduction multiple of the current, thereby ensuring that the current transformer 4 does not work when the power grid is in normal operation or outputting rated load.

[0035] At the same time, after receiving the current signal transmitted by the current detection module and the voltage signal transmitted by the voltage detection module, the control chip 1 itself can judge whether undervoltage, overcurrent and other problems occur in the power grid; when an abnormal state occurs in the power grid, the control chip 1 will give an electrical signal to the reactive compensation module.

[0036] Through the above steps, during operation, the system transmits only abnormal current signals to the control chip 1. Simultaneously, the control chip 1 combines all transmitted voltage signals, thereby facilitating reactive power compensation. By reducing the amount of acquired current signal data, the processing load of the control chip 1 is reduced, thereby extending the service life of the control chip and components in the current detection module.

[0037] Reference Figure 1 The reactive power compensation module includes a capacitor switch 9, a circuit breaker 10, a compensation capacitor 11, and a reactive power compensation controller 12. Specifically, the capacitor switch 9, the circuit breaker 10, and the compensation capacitor 11 are electrically connected in sequence, while the capacitor switch 9 is electrically connected to the control chip 1, and the reactive power compensation controller 12 is connected to the capacitor switch 9 and the circuit breaker 10.

[0038] In this embodiment, the reactive power compensation controller 12 is model VICMT-S13C and is capable of controlling the capacitor switching switches 9 and circuit breakers 10. When disconnecting the compensation capacitor 11, the reactive power compensation controller 12 first controls the circuit breaker 10 to disconnect, followed by the capacitor switching switch 9 to disconnect, thereby fully ensuring that the compensation capacitor 11 is in the disconnected state and simultaneously reducing the impact of the arc generated when the compensation capacitor 11 is disconnected on the circuit. When connecting the compensation capacitor 11, the reactive power compensation controller 12 first controls the circuit breaker 10 to connect, followed by the capacitor switching switch 9 to connect, thereby connecting the compensation capacitor 11. The number of capacitor switching switches 9, circuit breakers 10, and compensation capacitors 11 is one-to-one and different from one another. Each capacitor switching switch 9 and circuit breaker 10 is electrically connected to the reactive power compensation controller 12, thereby achieving final reactive power compensation and dual control and protection of the compensation capacitor 11. The circuit breaker 10 can be an existing one and will not be described in detail here.

[0039] The reactive power compensation module also includes a zero-crossing detection circuit 20, which is electrically connected to the control chip 1. The zero-crossing detection circuit 20 is used to detect whether the compensation capacitor 11 is fully connected or closed based on the acquired signal, thereby ensuring normal circuit operation and providing accurate reactive power compensation. The zero-crossing detection circuit 20 can be adaptively selected based on different needs.

[0040] When the control chip 1 gives the reactive power compensation module a corresponding electrical signal, the reactive power compensation controller 12 controls the connection or disconnection of the capacitor switch 9 and the circuit breaker 10, thereby realizing the connection and disconnection of the compensation capacitor 11, thereby realizing reactive power compensation for the power grid, thereby ensuring that problems such as overcurrent and undervoltage no longer occur in the power grid.

[0041] In addition, the control system also includes a reset circuit 13, a power supply 14, a temperature and humidity sensor module 15, a storage module 17 and a display module 16; and the reset circuit 13, the power supply 14, the temperature and humidity sensor module 15, the storage module 17 and the display module 16 are all electrically connected to the control chip 1.

[0042] The reset circuit 13 is used to return the entire circuit to its initial state, facilitating inspection and maintenance when a circuit malfunction occurs. The power supply 14 serves as a driving power source to ensure the normal operation of the entire circuit. The temperature and humidity sensor module 15 is used to detect the temperature and humidity of the compensation capacitor 11, determining whether the compensation capacitor 11 is functioning properly and assisting the control chip 1 in selecting which compensation capacitor 11 to connect or disconnect. The display module 16 is an LCD screen that displays data such as the connection status, temperature and humidity information of the compensation capacitor 11. The storage module 17 is used to store the operating status information of the entire system.

[0043] In addition, the control system also includes a communication control module 18 and a monitoring backend 19. Specifically, the communication control module 18 is electrically connected to the monitoring backend 19, and the communication control module 18 is also electrically connected to the control chip 1. The communication control module 18 uses an RS485 communication interface, and the monitoring backend 19 is used to monitor the operating status of the entire system in real time.

[0044] Although the above description of the specific implementation methods of the present invention is combined with the accompanying drawings, it does not limit the scope of protection of the present invention. Technical personnel in the relevant field should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the present invention.

Claims

1. A capacitor reactive power compensation control system, characterized in that: It includes a control chip, a current detection module, a voltage detection module and a reactive power compensation module, wherein the current detection module, the voltage detection module and the reactive power compensation module are all electrically connected to the control chip; The current detection module includes a current acquisition circuit, a first filtering circuit, a current transformer and a resistor, wherein the current acquisition circuit, the first filtering circuit, the current transformer and the resistor are electrically connected in sequence, and the resistor is electrically connected to the control chip; The voltage detection module includes a voltage acquisition circuit, a second filtering circuit and an overvoltage comparison circuit, wherein the voltage acquisition circuit, the second filtering circuit and the overvoltage comparison circuit are electrically connected in sequence, and the overvoltage comparison circuit is electrically connected to the control chip; The reactive compensation module includes a switching capacitor switch, a circuit breaker, a compensation capacitor and a reactive compensation controller. The switching capacitor switch, the circuit breaker and the compensation capacitor are electrically connected in sequence. The switching capacitor switch is electrically connected to the control chip. The reactive compensation controller is connected to the switching capacitor switch and the circuit breaker.

2. A capacitor reactive power compensation control system according to claim 1, characterized in that: The control chip is an STM32 single-chip microcomputer.

3. A capacitor reactive power compensation control system according to claim 1, characterized in that: The model of the reactive power compensation controller is VICMT-S13C.

4. A capacitor reactive power compensation control system according to claim 1, characterized in that: The reactive power compensation module further includes a zero-crossing detection circuit, which is electrically connected to the control chip.

5. The capacitor reactive power compensation control system according to claim 1, characterized in that: The control system further includes a reset circuit, which is electrically connected to the control chip.

6. A capacitor reactive power compensation control system according to claim 1, characterized in that: The control system further includes a power supply, which is electrically connected to the control chip.

7. The capacitor reactive power compensation control system according to claim 1, characterized in that: The control system further includes a temperature and humidity sensing module, which is electrically connected to the control chip.

8. The capacitor reactive power compensation control system according to claim 1, characterized in that: The control system further includes a communication control module and a monitoring background, wherein the communication control module is electrically connected to the monitoring background, and the communication control module is electrically connected to the control chip.

9. The capacitor reactive power compensation control system according to claim 1, characterized in that: The control system further includes a storage module, which is electrically connected to the control chip.

10. The capacitor reactive power compensation control system according to claim 1, characterized in that: The control system further includes a display module, and the display module is electrically connected to the control chip.

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