A voltage compensation and harmonic elimination stabilizer control circuit for distribution network

Abstract

The present invention discloses a voltage compensation and detuning stabilizer control circuit for a distribution network, which relates to the technical field of distribution network control, and includes a DC module for providing DC power and receiving power; an AC module for providing AC power, receiving power and controlling power transmission; a bidirectional conversion module for inversion and rectification processing; an intelligent control module for signal reception and module control; a conversion mode control module for performing DC regulation, power storage and inversion work and providing compensation power; a DC compensation module for realizing power transmission between the conversion mode control module and the DC module; an AC compensation module for transmitting compensation power; and a detuning protection module for three-phase voltage detection and zero-sequence voltage detection, and performing detuning work and absorbing impact current. The voltage compensation and detuning stabilizer control circuit for a distribution network of the present invention improves the stability of the distribution network in performing DC or AC power distribution, and improves the power supply quality and power supply safety.

Description

Technical Field

[0001] The invention relates to the technical field of power distribution network control, in particular to a voltage compensation and detuning stabilizer control circuit for a power distribution network. Background Art

[0002] A distribution network is a power grid that receives electric energy from a transmission network or a regional power plant and distributes it locally or step by step according to voltage to various types of users through distribution facilities. It can perform DC distribution or AC distribution. In order to stabilize the independent capacitor voltage of the distribution network and accurately compensate for the harmonic voltage in the distribution network, the distribution network in the prior art generally adopts a voltage compensation circuit and a voltage detuning and stabilizing circuit using a voltage transformer method to suppress system resonant overvoltage and compensate for the electric energy in the distribution process of the distribution network. However, the voltage detuning and stabilizing circuit is easily affected by the impact current during the detuning process, which reduces the stability and safety of power supply and causes damage to the voltage detuning and stabilizing circuit. In addition, when performing voltage compensation processing, it is necessary to compensate for the DC and AC separately, which results in a larger circuit volume, complicated control and increased cost, and therefore needs to be improved. Summary of the invention

[0003] The embodiment of the present invention provides a voltage compensation and detuning stabilizer control circuit for a power distribution network to solve the problems raised in the above background technology.

[0004] According to an embodiment of the present invention, a voltage compensation and harmonic elimination stabilizer control circuit for a distribution network is provided, comprising: a DC module, a bidirectional conversion module, an AC module, an intelligent control module, a conversion mode control module, a DC compensation module, an AC compensation module and a harmonic elimination protection module;

[0005] A DC module is connected to the DC compensation module and the bidirectional conversion module, and is used to receive the first DC power, perform voltage compensation processing on the first DC power when receiving the first compensation power output by the DC compensation module, and receive the second DC power output by the bidirectional conversion module to supply power to the DC load;

[0006] an AC module, connected to the AC compensation module, the intelligent control module, and the bidirectional conversion module, for receiving the first AC power, performing voltage compensation processing on the first AC power when receiving the second compensation power output by the AC compensation module, receiving the second AC power output by the bidirectional conversion module, supplying power to the AC load, and stopping transmitting power to the AC load when receiving the first protection signal output by the intelligent control module;

[0007] a bidirectional conversion module, connected to the intelligent control module, for inverting the first DC power or the compensated first DC power and outputting the second AC power when receiving the inverter signal output by the intelligent control module, and rectifying the first AC power or the compensated first AC power and outputting the second DC power when not receiving the inverter signal;

[0008] an intelligent control module connected to the detuning protection module, and configured to output an inverter signal and a first compensation signal when the DC module is connected to the first DC power, stop outputting the inverter signal and outputting the second compensation signal when the DC module is not connected to the first DC power, output the second protection signal and stop outputting the inverter signal when a short circuit fault occurs in the DC module, receive the first voltage signal, the second voltage signal, the third voltage signal and the fourth voltage signal output by the detuning protection module, and output the third protection signal and the first protection signal when a ground fault occurs in the AC module, output the first adjustment signal when resonance occurs in the AC module, output the first pulse signal when outputting the first compensation signal, and output the second pulse signal when outputting the second compensation signal;

[0009] a conversion mode control module, connected to the bidirectional conversion module, the intelligent control module and the DC compensation module, and used to perform DC-DC regulation and electric energy storage on the first DC electric energy or the second DC electric energy transmitted by the DC compensation module, and when receiving the first pulse signal, perform DC-DC regulation on the stored electric energy and output the first compensation electric energy, and when receiving the second pulse signal, perform DC-AC regulation on the stored electric energy and output the second compensation electric energy;

[0010] A DC compensation module, connected to the bidirectional conversion module and the intelligent control module, for transmitting the first compensation electric energy to the DC module and transmitting the first DC electric energy or the second DC electric energy to the conversion mode control module when receiving the first compensation signal;

[0011] an AC compensation module, connected to the conversion mode control module and the intelligent control module, and configured to transmit the second compensation electric energy to the AC module when receiving the second compensation signal;

[0012] The detuning protection module is connected to the AC module, and is used to perform three-phase voltage detection and zero-sequence voltage detection on the AC module, perform signal conditioning and filtering on the detected signals, and output a first voltage signal, a second voltage signal, a third voltage signal, and a fourth voltage signal. When the first adjustment signal is received, the detuning work is performed, and when the third protection signal is received, the impact current is absorbed.

[0013] As a further solution of the present invention: the DC module includes a DC grid, a first capacitor, a first resistor and a DC load; the bidirectional conversion module includes a first converter; the intelligent control module includes a first controller;

[0014] Preferably, the first end of the DC grid is connected to the first end of the first resistor and the first DC end of the first converter, and the second end of the DC grid, the second DC end of the first converter, the second end of the first resistor and the DC compensation module are connected through the first capacitor, the first AC end and the second AC end of the first converter are connected to the AC module, and the control end of the first converter is connected to the IO1 end of the first controller.

[0015] As a further solution of the present invention: the AC module includes a first inductor, a second inductor, a third inductor, a second relay, a second relay switch, an AC power grid and an AC load;

[0016] Preferably, the first end of the AC power grid is connected to the first AC end of the first converter and is connected to the first moving end of the second relay switch through the first inductor, the second end of the AC power grid is connected to the second AC end of the first converter and is connected to the second moving end of the second relay switch through the second inductor, the third end of the AC power grid is connected to the third AC end of the first converter and is connected to the third moving end of the second relay switch through the third inductor, the first static end, the second static end and the third static end of the second relay switch are respectively connected to the first end, the second end and the third end of the AC load, the control end of the second relay switch is connected to one end of the second relay, and the other end of the second relay is connected to the IO10 end of the first controller.

[0017] As a further solution of the present invention: the DC compensation module includes a second capacitor, a sixth thyristor, a second thyristor and a third thyristor;

[0018] Preferably, the first end of the second capacitor is connected to the second end of the first resistor, the anode of the sixth thyristor and the first end of the second thyristor, the cathode of the sixth thyristor is connected to the second end of the second capacitor, the first end of the third thyristor and the second end of the DC power grid, the control end of the second thyristor is connected to the control end of the third thyristor and the IO2 end of the first controller, the second end of the second thyristor and the second end of the third thyristor are connected to the conversion mode control module, and the control end of the sixth thyristor is connected to the IO3 end of the first controller.

[0019] As a further solution of the present invention: the AC compensation module includes a first thyristor and a fourth thyristor;

[0020] Preferably, the first end of the first thyristor is connected to the first end of the AC power grid, the first end of the fourth thyristor is connected to the second end of the AC power grid, the second end of the first thyristor and the second end of the fourth thyristor are connected to the conversion mode control module, and the control end of the first thyristor and the control end of the fourth thyristor are both connected to the IO4 end of the first controller.

[0021] As a further solution of the present invention: the conversion mode control module includes a first power tube, a second power tube, a third power tube, a fourth power tube, a fifth power tube, a sixth power tube, a fourth inductor, a fifth inductor, a sixth inductor and a third capacitor;

[0022] Preferably, the collector of the first power tube is connected to the collector of the third power tube and the collector of the fifth power tube, and is connected to the emitter of the sixth power tube, the emitter of the fourth power tube and the emitter of the second power tube through the third capacitor, the emitter of the first power tube is connected to the collector of the second power tube and is connected to the second end of the second controllable through the fourth inductor, the emitter of the third power tube is connected to the collector of the fourth power tube and the second end of the third thyristor and is connected to the second end of the fourth thyristor through the fifth inductor, the emitter of the fifth power tube is connected to the collector of the sixth power tube and is connected to the third AC end of the first inverter through the sixth inductor, and the gate of the first power tube, the gate of the second power tube, the gate of the third power tube, the gate of the fourth power tube, the gate of the fifth power tube and the gate of the sixth power tube are respectively connected to the IO12 end, IO13 end, IO14 end, IO15 end, IO16 end and IO17 end of the first controller.

[0023] As a further solution of the present invention: the harmonic elimination protection module includes a first detection device, a fifth thyristor, a signal processing device, a first protection resistor, a first relay and a first relay switch;

[0024] Preferably, the first detection end, the second detection end and the third detection end of the first detection device are respectively connected to a moving end, a second moving end and a third moving end of the second relay switch, the first output end, the second output end and the third output end of the first detection device are respectively connected to the first end, the second end and the third end of the signal processing device, the fourth output end of the first detection device is connected to one end of the fifth thyristor and the fourth end of the signal processing device, the first grounding end and the second grounding end of the first detection device are both connected to the other end and the ground end of the fifth thyristor, the control end of the fifth thyristor is connected to the IO9 end of the first controller, the fifth end, the sixth end, the seventh end and the eighth end of the signal processing device are respectively connected to the IO5 end, the IO6 end, the IO7 end and the IO8 end of the first controller, the third grounding end of the first detection device is connected to the moving end of the first relay switch and is connected to the static end and the ground end of the first relay switch through the first protective resistor, the control end of the first relay switch is connected to one end of the first relay, and the other end of the first relay is connected to the IO11 end of the first controller.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the voltage compensation and detuning stabilizer control circuit for the power distribution network of the present invention can realize the power distribution and transmission control between the DC module and the AC module by the bidirectional conversion module, the detuning protection module performs detuning and short-circuit protection processing on the AC power, the intelligent control module controls the conversion mode control module to perform DC-DC regulation or DC-AC regulation according to the power supply status of the DC module and the AC module, and performs DC compensation processing on the DC module by the DC compensation module, and performs AC compensation processing on the AC module by the AC compensation module, thereby improving the stability of the DC or AC power distribution of the distribution network, and improving the power supply quality and power supply safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0027] Figure 1 A schematic block diagram of a voltage compensation and detuning stabilizer control circuit for a distribution network provided in an embodiment of the present invention.

[0028] Figure 2 A circuit diagram of a voltage compensation and detuning stabilizer control circuit for a distribution network provided in an embodiment of the present invention.

[0029] Figure 3 A circuit diagram of a conversion mode control module provided in an embodiment of the present invention.

[0030] Reference numerals:

[0031] 1: DC module; 2: Bidirectional conversion module; 3: AC module; 4: Intelligent control module; 5: Conversion mode control module; 6: DC compensation module; 7: AC compensation module; 8: Detuning protection module. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In one embodiment, see Figure 1, a voltage compensation and harmonic elimination stabilizer control circuit for a distribution network, comprising: a DC module 1, a bidirectional conversion module 2, an AC module 3, an intelligent control module 4, a conversion mode control module 5, a DC compensation module 6, an AC compensation module 7 and a harmonic elimination protection module 8;

[0034] Specifically, the DC module 1 is connected to the DC compensation module 6 and the bidirectional conversion module 2, and is used to access the first DC power, and when receiving the first compensation power output by the DC compensation module 6, performs voltage compensation processing on the first DC power, and receives the second DC power output by the bidirectional conversion module 2 to supply power to the DC load;

[0035] The AC module 3 is connected to the AC compensation module 7, the intelligent control module 4, and the bidirectional conversion module 2, and is used to receive the first AC power, perform voltage compensation processing on the first AC power when receiving the second compensation power output by the AC compensation module 7, receive the second AC power output by the bidirectional conversion module 2, supply power to the AC load, and stop transmitting power to the AC load when receiving the first protection signal output by the intelligent control module 4;

[0036] The bidirectional conversion module 2 is connected to the intelligent control module 4 and is used to invert the first DC power or the compensated first DC power and output the second AC power when receiving the inverter signal output by the intelligent control module 4, and rectify the first AC power or the compensated first AC power and output the second DC power when not receiving the inverter signal;

[0037] The intelligent control module 4 is connected to the detuning protection module 8, and is used for outputting an inverter signal and a first compensation signal when the DC module 1 is connected to the first DC power, stopping outputting the inverter signal and outputting the second compensation signal when the DC module 1 is not connected to the first DC power, outputting the second protection signal and stopping outputting the inverter signal when a short circuit fault occurs in the DC module 1, receiving the first voltage signal, the second voltage signal, the third voltage signal and the fourth voltage signal output by the detuning protection module 8, and outputting the third protection signal and the first protection signal when a ground fault occurs in the AC module 3, outputting the first adjustment signal when resonance occurs in the AC module 3, outputting the first pulse signal when outputting the first compensation signal, and outputting the second pulse signal when outputting the second compensation signal;

[0038] The conversion mode control module 5 is connected to the bidirectional conversion module 2, the intelligent control module 4 and the DC compensation module 6, and is used to perform DC-DC regulation and electric energy storage on the first DC electric energy or the second DC electric energy transmitted by the DC compensation module 6, and when receiving the first pulse signal, perform DC-DC regulation on the stored electric energy and output the first compensation electric energy, and when receiving the second pulse signal, perform DC-AC regulation on the stored electric energy and output the second compensation electric energy;

[0039] A DC compensation module 6, connected to the bidirectional conversion module 2 and the intelligent control module 4, is used to transmit the first compensation power to the DC module 1 and transmit the first DC power or the second DC power to the conversion mode control module 5 when receiving the first compensation signal;

[0040] The AC compensation module 7 is connected to the conversion mode control module 5 and the intelligent control module 4, and is used to transmit the second compensation electric energy to the AC module 3 when receiving the second compensation signal;

[0041] The detuning protection module 8 is connected to the AC module 3, and is used to perform three-phase voltage detection and zero-sequence voltage detection on the AC module 3, perform signal conditioning and filtering on the detected signals, and output a first voltage signal, a second voltage signal, a third voltage signal, and a fourth voltage signal. When the first adjustment signal is received, the detuning work is performed, and when the third protection signal is received, the impact current is absorbed.

[0042] In a specific embodiment, the DC module 1 can adopt a DC circuit composed of a DC grid, a resistor, and a DC load, which can access and provide DC power and supply power to the DC load; the bidirectional conversion module 2 can adopt a bidirectional conversion circuit composed of a bidirectional converter, which can perform inversion and rectification; the AC module 3 can adopt an AC circuit composed of an inductor, a relay, an AC grid, an AC load, etc., which can access and provide AC power, control the transmission of power and supply power to the AC load; the intelligent control module 4 can adopt an intelligent control circuit composed of a single-chip microcomputer, which integrates many components such as an operator, a controller, a memory, and an input and output device to realize signal processing, data storage, module control, timing control and other functions; the conversion The mode control module 5 can adopt a conversion mode control circuit composed of IGBT, inductor and capacitor, and can perform DC-DC regulation and DC-AC regulation and store and discharge energy; the above-mentioned DC compensation module 6 can adopt a DC compensation circuit composed of unidirectional thyristor, bidirectional thyristor and capacitor, and can control the electric energy interaction between the conversion mode control module 5 and the DC module 1; the above-mentioned AC compensation module 7 can adopt an AC compensation module 7 composed of bidirectional thyristor, receive the electric energy provided by the conversion mode control module 5 and provide compensation electric energy for the AC module 3; the above-mentioned detuning protection module 8 can adopt a detuning protection circuit composed of voltage transformer, bidirectional thyristor, absorption resistor, etc., and can perform detuning processing and ground fault protection processing.

[0043] In another embodiment, see Figure 1 , Figure 2 and Figure 3The DC module 1 includes a DC grid, a first capacitor C1, a first resistor R1 and a DC load; the bidirectional conversion module 2 includes a first converter T1; the intelligent control module 4 includes a first controller U1;

[0044] Specifically, the first end of the DC grid is connected to the first end of the first resistor R1 and the first DC end of the first converter T1, and is connected to the second end of the DC grid, the second DC end of the first converter T1, the second end of the first resistor R1 and the DC compensation module 6 through the first capacitor C1. The first AC end and the second AC end of the first converter T1 are connected to the AC module 3, and the control end of the first converter T1 is connected to the IO1 end of the first controller U1.

[0045] In a specific embodiment, the first converter T1 may be composed of four groups of IGBTs and four groups of diodes, wherein the four groups of IGBTs perform inversion work and the four groups of diodes perform rectification work; the first controller U1 may be a STM32 single-chip microcomputer.

[0046] Further, the AC module 3 includes a first inductor L1, a second inductor L2, a third inductor L3, a second relay K2, a second relay switch K2-1, an AC grid and an AC load;

[0047] Specifically, the first end of the AC power grid is connected to the first AC end of the first converter T1 and is connected to the first moving end of the second relay switch K2-1 through the first inductor L1, the second end of the AC power grid is connected to the second AC end of the first converter T1 and is connected to the second moving end of the second relay switch K2-1 through the second inductor L2, the third end of the AC power grid is connected to the third AC end of the first converter T1 and is connected to the third moving end of the second relay switch K2-1 through the third inductor L3, the first static end, the second static end and the third static end of the second relay switch K2-1 are respectively connected to the first end, the second end and the third end of the AC load, the control end of the second relay switch K2-1 is connected to one end of the second relay K2, and the other end of the second relay K2 is connected to the IO10 end of the first controller U1.

[0048] In a specific embodiment, the second relay switch K2 - 1 may be a three-pole, three-throw normally closed switch, and the second relay K2 is controlled to open by magnetic attraction.

[0049] Further, the DC compensation module 6 includes a second capacitor C2, a sixth thyristor S6, a second thyristor S2 and a third thyristor S3;

[0050] Specifically, the first end of the second capacitor C2 is connected to the second end of the first resistor R1, the anode of the sixth thyristor S6 and the first end of the second thyristor S2, the cathode of the sixth thyristor S6 is connected to the second end of the second capacitor C2, the first end of the third thyristor S3 and the second end of the DC power grid, the control end of the second thyristor S2 is connected to the control end of the third thyristor S3 and the IO2 end of the first controller U1, the second end of the second thyristor S2 and the second end of the third thyristor S3 are connected to the conversion mode control module 5, and the control end of the sixth thyristor S6 is connected to the IO3 end of the first controller U1.

[0051] In a specific embodiment, the sixth thyristor S6 can be a unidirectional thyristor, which is controlled by the second protection signal output from the IO3 terminal of the first controller U1; the second thyristor S2 and the third thyristor S3 can both be bidirectional thyristors, which are controlled by the first compensation signal output from the IO2 terminal of the first controller U1.

[0052] Further, the AC compensation module 7 includes a first thyristor S1 and a fourth thyristor S4;

[0053] Specifically, a first end of the first thyristor S1 is connected to a first end of the AC power grid, a first end of the fourth thyristor S4 is connected to a second end of the AC power grid, a second end of the first thyristor S1 and a second end of the fourth thyristor S4 are connected to a conversion mode control module 5, and a control end of the first thyristor S1 and a control end of the fourth thyristor S4 are both connected to an IO4 end of the first controller U1.

[0054] In a specific embodiment, both the first thyristor S1 and the fourth thyristor S4 can be bidirectional thyristors, and are controlled by the second compensation signal outputted by the IO4 terminal of the first controller U1.

[0055] Further, the conversion mode control module 5 includes a first power tube Q1, a second power tube Q2, a third power tube Q3, a fourth power tube Q4, a fifth power tube Q5, a sixth power tube Q6, a fourth inductor L4, a fifth inductor L5, a sixth inductor L6 and a third capacitor C3;

[0056] Specifically, the collector of the first power tube Q1 is connected to the collector of the third power tube Q3 and the collector of the fifth power tube Q5, and is connected to the emitter of the sixth power tube Q6, the emitter of the fourth power tube Q4 and the emitter of the second power tube Q2 through the third capacitor C3; the emitter of the first power tube Q1 is connected to the collector of the second power tube Q2 and is connected to the second controllable end through the fourth inductor L4; the emitter of the third power tube Q3 is connected to the collector of the fourth power tube Q4 and the second end of the third thyristor S3 and is connected to the emitter of the fifth inductor L4 through the fifth inductor L 5 is connected to the second end of the fourth thyristor S4, the emitter of the fifth power tube Q5 is connected to the collector of the sixth power tube Q6 and is connected to the third AC end of the first inverter through the sixth inductor L6, and the gate of the first power tube Q1, the gate of the second power tube Q2, the gate of the third power tube Q3, the gate of the fourth power tube Q4, the gate of the fifth power tube Q5 and the gate of the sixth power tube Q6 are respectively connected to the IO12 end, the IO13 end, the IO14 end, the IO15 end, the IO16 end and the IO17 end of the first controller U1.

[0057] In a specific embodiment, the first power tube Q1, the second power tube Q2, the third power tube Q3, the fourth power tube Q4, the fifth power tube Q5 and the sixth power tube Q6 can all be IGBTs. When the first power tube Q1, the second power tube Q2, the third power tube Q3 and the fourth power tube Q4 receive a first pulse signal provided by the first controller U1, they cooperate with the fourth inductor L4 to perform DC-DC bidirectional regulation. When the first power tube Q1, the second power tube Q2, the third power tube Q3, the fourth power tube Q4, the fifth power tube Q5 and the sixth power tube Q6 receive a second pulse signal provided by the first controller U1, they cooperate with the fourth inductor L4, the fifth inductor L5 and the sixth inductor L6 to perform DC-AC regulation.

[0058] Further, the detuning protection module 8 includes a first detection device PV1, a fifth thyristor S5, a signal processing device, a first protection resistor RL1, a first relay K1 and a first relay switch K1-1;

[0059] Specifically, the first detection end, the second detection end and the third detection end of the first detection device PV1 are respectively connected to the first moving end, the second moving end and the third moving end of the second relay switch K2-1, the first output end, the second output end and the third output end of the first detection device PV1 are respectively connected to the first end, the second end and the third end of the signal processing device, the fourth output end of the first detection device PV1 is connected to one end of the fifth thyristor S5 and the fourth end of the signal processing device, the first grounding end and the second grounding end of the first detection device PV1 are both connected to the other end of the fifth thyristor S5 and the ground end, and the fifth thyristor S5 is connected to the ground end. The control end of the silicon control rectifier S5 is connected to the IO9 end of the first controller U1, the fifth end, the sixth end, the seventh end and the eighth end of the signal processing device are respectively connected to the IO5 end, the IO6 end, the IO7 end and the IO8 end of the first controller U1, the third grounding end of the first detection device PV1 is connected to the moving end of the first relay switch K1-1 and the static end and the ground end of the first relay switch K1-1 through the first protection resistor RL1, the control end of the first relay switch K1-1 is connected to one end of the first relay K1, and the other end of the first relay K1 is connected to the IO11 end of the first controller U1.

[0060] In a specific embodiment, the above-mentioned first detection device PV1 can be composed of three groups of voltage transformers, wherein the fourth output terminal and the second grounding terminal of the first detection device PV1 are the open delta sides of the voltage transformer, detecting the zero-sequence voltage; the above-mentioned first protection resistor RL1 can choose a nonlinear resistor; the above-mentioned fifth thyristor S5 can choose a bidirectional thyristor; the above-mentioned signal processing device can be composed of a voltage transformer, a resistor and a capacitor, and further perform signal conditioning and signal filtering processing; the above-mentioned first relay switch K1-1 can choose a normally closed switch, and the first relay K1 controls the first relay switch K1-1 to be disconnected by magnetic attraction.

[0061] In a voltage compensation and detuning stabilizer control circuit for a power distribution network in this embodiment, a first DC power is provided by a DC power grid. At the same time, to ensure the stability of the provided first DC power, the IO12 terminal, IO13 terminal, IO14 terminal and IO15 terminal of the first controller U1 respectively control the operation of the first power tube Q1, the second power tube Q2, the third power tube Q3 and the fourth power tube Q4. At the same time, the IO2 terminal of the first controller U1 controls the conduction of the second thyristor S2 and the third thyristor S3, so that when the first DC power rises, the first DC power is DC-DC regulated by the fourth inductor L4, the first power tube Q1, the second power tube Q2, the third power tube Q3 and the fourth power tube Q4, and is stored by the third capacitor C3. , so that when the first DC power decreases, the power released by the third capacitor C3 is DC-DC regulated by the fourth inductor L4, the first power tube Q1, the second power tube Q2, the third power tube Q3 and the fourth power tube Q4, and the first DC power is compensated to supply power to the DC load, and the IO1 end of the first controller U1 controls the first converter T1 to perform inversion work, when a short circuit fault occurs in the DC module 1, the first controller U1 stops outputting the inversion signal, and at the same time, the IO3 end of the first controller U1 outputs a second protection signal to control the sixth thyristor S6 to turn on, stop DC power supply, perform three-phase inversion on the first DC power or the compensated first DC power and output the second AC power, the second AC power and The first AC power provided by the AC power grid can be transmitted to the AC load through the first inductor L1, the second inductor L2, the third inductor L3 and the second relay switch K2-1. When the DC power grid is not powered and the AC power grid is powered, the IO4 terminal of the first controller U1 will control the first thyristor S1 and the fourth thyristor S4 to be turned on. At the same time, the first controller U1 controls the first power tube Q1, the second power tube Q2, the third power tube Q3, the fourth power tube Q4, the fifth power tube Q5 and the sixth power tube Q6 to perform inversion work, and inverts the electric energy released by the third capacitor C3 to compensate for the first AC power provided by the AC power grid. The first converter T1 can rectify the first AC power and then supply power to the DC load. The first detection device PV1 can perform three-phase voltage detection processing and zero-sequence voltage detection processing on the transmitted first AC power, the compensated first AC power or the second AC power. The detected signal is processed by the signal processing device and received by the IO5, IO6, IO7 and IO8 terminals of the first controller U1, so that the first controller U1 can judge whether a resonant voltage is generated according to the detected signal, and trigger the fifth thyristor S5 to turn on when ferromagnetic resonance occurs, thereby generating a zero-sequence current for demagnetization. When a ground fault occurs in the AC module 3, the IO11 terminal of the first controller U1 outputs a third protection signal to control the first relay K1 to be energized, the first relay switch K1-1 is disconnected, and the first absorption circuit absorbs the impact current.At the same time, the IO10 terminal of the first controller U1 outputs the first protection signal to control the second relay K2 to be energized, and the second relay switch K2-1 is disconnected to stop the AC power supply.

[0062] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0063] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A voltage compensation and detuning stabilizer control circuit for a distribution network, characterized in that: The voltage compensation and harmonic elimination stabilizer control circuit for the power distribution network comprises: a DC module, a bidirectional conversion module, an AC module, an intelligent control module, a conversion mode control module, a DC compensation module, an AC compensation module and a harmonic elimination protection module; The DC module is connected to the DC compensation module and the bidirectional conversion module, and is used to receive the first DC power, perform voltage compensation processing on the first DC power when receiving the first compensation power output by the DC compensation module, and receive the second DC power output by the bidirectional conversion module to supply power to the DC load; The AC module is connected to the AC compensation module, the intelligent control module, and the bidirectional conversion module, and is used to receive the first AC power, perform voltage compensation processing on the first AC power when receiving the second compensation power output by the AC compensation module, receive the second AC power output by the bidirectional conversion module, supply power to the AC load, and stop transmitting power to the AC load when receiving the first protection signal output by the intelligent control module; The bidirectional conversion module is connected to the intelligent control module and is used to invert the first DC power or the compensated first DC power and output the second AC power when receiving the inverter signal output by the intelligent control module, and rectify the first AC power or the compensated first AC power and output the second DC power when not receiving the inverter signal; The intelligent control module is connected to the detuning protection module, and is used to output an inverter signal and a first compensation signal when the DC module is connected to the first DC power, stop outputting the inverter signal and outputting the second compensation signal when the DC module is not connected to the first DC power, output the second protection signal and stop outputting the inverter signal when a short circuit fault occurs in the DC module, receive the first voltage signal, the second voltage signal, the third voltage signal and the fourth voltage signal output by the detuning protection module, and output the third protection signal and the first protection signal when a ground fault occurs in the AC module, output the first adjustment signal when resonance occurs in the AC module, output the first pulse signal when outputting the first compensation signal, and output the second pulse signal when outputting the second compensation signal; The conversion mode control module is connected to the bidirectional conversion module, the intelligent control module and the DC compensation module, and is used to perform DC-DC regulation and electric energy storage on the first DC electric energy or the second DC electric energy transmitted by the DC compensation module, and when receiving the first pulse signal, perform DC-DC regulation on the stored electric energy and output the first compensation electric energy, and when receiving the second pulse signal, perform DC-AC regulation on the stored electric energy and output the second compensation electric energy; The DC compensation module is connected to the bidirectional conversion module and the intelligent control module, and is used to transmit the first compensation electric energy to the DC module and transmit the first DC electric energy or the second DC electric energy to the conversion mode control module when receiving the first compensation signal; The AC compensation module is connected to the conversion mode control module and the intelligent control module, and is used to transmit the second compensation electric energy to the AC module when receiving the second compensation signal; The detuning protection module is connected to the AC module, and is used to perform three-phase voltage detection and zero-sequence voltage detection on the AC module, perform signal conditioning and filtering processing on the detected signals, and output a first voltage signal, a second voltage signal, a third voltage signal, and a fourth voltage signal. When receiving the first adjustment signal, the detuning work is performed, and when receiving the third protection signal, the impact current is absorbed; the detuning protection module includes a first detection device, a fifth thyristor, a signal processing device, a first protection resistor, a first relay, and a first relay switch.

2. A voltage compensation and detuning stabilizer control circuit for a distribution network according to claim 1, characterized in that: The DC module includes a DC grid, a first capacitor, a first resistor and a DC load; the bidirectional conversion module includes a first converter; and the intelligent control module includes a first controller; The first end of the DC grid is connected to the first end of the first resistor and the first DC end of the first converter, and is connected to the second end of the DC grid, the second DC end of the first converter, the second end of the first resistor and the DC compensation module through the first capacitor. The first AC end and the second AC end of the first converter are connected to the AC module, and the control end of the first converter is connected to the IO1 end of the first controller.

3. A voltage compensation and detuning stabilizer control circuit for a distribution network according to claim 2, characterized in that: The AC module includes a first inductor, a second inductor, a third inductor, a second relay, a second relay switch, an AC power grid and an AC load; The first end of the AC power grid is connected to the first AC end of the first converter and is connected to the first moving end of the second relay switch through the first inductor, the second end of the AC power grid is connected to the second AC end of the first converter and is connected to the second moving end of the second relay switch through the second inductor, the third end of the AC power grid is connected to the third AC end of the first converter and is connected to the third moving end of the second relay switch through the third inductor, the first static end, the second static end and the third static end of the second relay switch are respectively connected to the first end, the second end and the third end of the AC load, the control end of the second relay switch is connected to one end of the second relay, and the other end of the second relay is connected to the IO10 end of the first controller.

4. A voltage compensation and detuning stabilizer control circuit for a distribution network according to claim 3, characterized in that: The DC compensation module includes a second capacitor, a sixth thyristor, a second thyristor and a third thyristor; The first end of the second capacitor is connected to the second end of the first resistor, the anode of the sixth thyristor and the first end of the second thyristor, the cathode of the sixth thyristor is connected to the second end of the second capacitor, the first end of the third thyristor and the second end of the DC power grid, the control end of the second thyristor is connected to the control end of the third thyristor and the IO2 end of the first controller, the second end of the second thyristor and the second end of the third thyristor are connected to the conversion mode control module, and the control end of the sixth thyristor is connected to the IO3 end of the first controller.

5. A voltage compensation and detuning stabilizer control circuit for a distribution network according to claim 4, characterized in that: The AC compensation module includes a first thyristor and a fourth thyristor; The first end of the first thyristor is connected to the first end of the AC power grid, the first end of the fourth thyristor is connected to the second end of the AC power grid, the second end of the first thyristor and the second end of the fourth thyristor are connected to the conversion mode control module, and the control end of the first thyristor and the control end of the fourth thyristor are both connected to the IO4 end of the first controller.

6. A voltage compensation and harmonic elimination stabilizer control circuit for a distribution network according to claim 5, characterized in that: The conversion mode control module includes a first power tube, a second power tube, a third power tube, a fourth power tube, a fifth power tube, a sixth power tube, a fourth inductor, a fifth inductor, a sixth inductor and a third capacitor; The collector of the first power tube is connected to the collector of the third power tube and the collector of the fifth power tube, and is connected to the emitter of the sixth power tube, the emitter of the fourth power tube and the emitter of the second power tube through the third capacitor; the emitter of the first power tube is connected to the collector of the second power tube and is connected to the second end of the second controllable through the fourth inductor; the emitter of the third power tube is connected to the collector of the fourth power tube and the second end of the third thyristor and is connected to the second end of the fourth thyristor through the fifth inductor; the emitter of the fifth power tube is connected to the collector of the sixth power tube and is connected to the third AC end of the first inverter through the sixth inductor; the gate of the first power tube, the gate of the second power tube, the gate of the third power tube, the gate of the fourth power tube, the gate of the fifth power tube and the gate of the sixth power tube are respectively connected to the IO12 end, IO13 end, IO14 end, IO15 end, IO16 end and IO17 end of the first controller.

7. A voltage compensation and harmonic elimination stabilizer control circuit for a distribution network according to claim 6, characterized in that: The detuning protection module includes a first detection device, a fifth thyristor, a signal processing device, a first protection resistor, a first relay and a first relay switch; The first detection end, the second detection end and the third detection end of the first detection device are respectively connected to a moving end, a second moving end and a third moving end of the second relay switch, the first output end, the second output end and the third output end of the first detection device are respectively connected to the first end, the second end and the third end of the signal processing device, the fourth output end of the first detection device is connected to one end of the fifth thyristor and the fourth end of the signal processing device, the first grounding end and the second grounding end of the first detection device are both connected to the other end and the ground end of the fifth thyristor, the control end of the fifth thyristor is connected to the IO9 end of the first controller, the fifth end, the sixth end, the seventh end and the eighth end of the signal processing device are respectively connected to the IO5 end, the IO6 end, the IO7 end and the IO8 end of the first controller, the third grounding end of the first detection device is connected to the moving end of the first relay switch and is connected to the static end and the ground end of the first relay switch through the first protection resistor, the control end of the first relay switch is connected to one end of the first relay, and the other end of the first relay is connected to the IO11 end of the first controller.

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