A reactive power compensation system for distribution network

Abstract

The invention discloses a reactive power compensation system for a distribution network, and relates to the field of power compensation. The reactive power compensation system for the distribution network controls a VHO high voltage or a VLO low voltage output through a single chip microcomputer pin in a high-low voltage conversion circuit by controlling a 9013 triode. Meanwhile, a three-bit combination switch SW is connected to the single chip microcomputer pin through a pull-down resistor, and a total of 8 high voltage maintenance times can be provided. When a control terminal COM in an input and output terminal row JP is disconnected, a P32 pin is at a high level, and both QH and QL power tubes are disconnected, and at this time, a stable control circuit has no output. When COM is connected to a ground (Jp6), a P32 pin is at a low level, and QH conducts high voltage output. After a period of time, QH is disconnected, and QL is connected to low voltage output. Until COM is disconnected from the ground, QH and QL are both cut off, and at this time, the stable control circuit has no output. After the reactive power compensation is performed on the distribution network circuit, a lower voltage is used to maintain the reactive power compensation of the distribution network circuit, so as to control energy costs.

Description

Technical Field

[0001] The invention relates to a power compensation technology, and in particular to a reactive power compensation system for a distribution network. Background Art

[0002] With the rapid development of the national economy and the increase in electricity consumption, the economic operation of the power grid has received increasing attention; and the reactive power optimization of the distribution system is an effective means to ensure the safety and economic operation of the system. Reasonable optimization of reactive power can not only improve the voltage level of the system operation, but also reduce the active and reactive network losses of the system, and improve the operating efficiency of the power system.

[0003] Solutions such as particle swarm optimization and genetic algorithm have been proposed for the optimization of power system unit combination and reactive power optimization of distribution network system. Particle swarm optimization is a heuristic algorithm based on swarm intelligence. It has fast convergence speed, simple calculation and strong versatility. It can be easily used to solve nonlinear, discontinuous, multi-constrained and multi-variable complex optimization problems with discrete variables. However, particle swarm optimization has the problem of being easily trapped in local convergence. Genetic algorithm is a computational model of biological evolution process that simulates the natural selection and genetic mechanism of Darwin's theory of biological evolution. It is a method of searching for the optimal solution by simulating the natural evolution process. Its main features are that it directly operates on structural objects, without the limitation of derivative and function continuity; it has inherent implicit parallelism and better global optimization ability; it adopts probabilistic optimization method and can adaptively adjust the search direction. However, since a single genetic algorithm code cannot fully express the constraints of the optimization problem, it is necessary to consider the use of thresholds for infeasible solutions, which increases the workload and solution time, making the efficiency of genetic algorithms usually lower than other traditional optimization methods. Genetic algorithms also have the problem of easy premature convergence.

[0004] At present, there are two main methods to deal with the above problems: distribution network reconstruction and reactive voltage control. Distribution network reconstruction can balance the load and improve the quality and reliability of power supply voltage. Traditional distribution network reconstruction relies on the cooperation of connecting switches and section switches to achieve power flow conversion, but is limited by the number of operating actions of connecting switches and section switches. In actual operation, network reconstruction is often performed once a quarter or even longer, and rapid regulation of power flow distribution cannot be achieved. VVC equipment is mainly composed of on-load voltage regulators, switchable capacitor groups, and static reactive power compensation devices. However, these VVC devices cannot achieve continuous reactive power regulation, nor can they flexibly control the power flow direction, and most VVC devices have a slow response speed and are difficult to face the above challenges.

[0005] However, the current reactive power compensation of distribution networks is mostly carried out by continuously providing stable additional power to the distribution network, which will lead to power loss due to the continuous provision of additional power. Summary of the invention

[0006] The object of the present invention is to provide a reactive power compensation system for a distribution network to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solution: a reactive power compensation system for a distribution network, comprising:

[0008] A distribution network system creation module is used to create a virtual distribution network system and introduce a flexible interconnection device composed of an intelligent soft switch and an energy storage element at the end of the created virtual distribution network system;

[0009] An operation optimization model creation module, used to establish an operation optimization model of a distribution network system having the flexible interconnection device, and the operation optimization model creation module is also used to determine whether the operation optimization model of the current distribution network system has changed;

[0010] A day-ahead optimization model creation module, the day-ahead optimization model creation module is used to receive the operation optimization model of the distribution network system established by the operation optimization model creation module and generate a day-ahead optimization model;

[0011] An intraday optimization model creation module, the intraday optimization model creation module is used to receive the operation optimization model of the distribution network system established by the operation optimization model creation module and generate an intraday optimization model;

[0012] The day-ahead optimization module is used to optimize the distribution network system at the hourly level by using the day-ahead optimization model created by the day-ahead optimization model creation module, so as to minimize the day-ahead loss of the distribution network system;

[0013] An intraday optimization module is used to optimize the distribution network system at the minute level within a day using the intraday optimization model created by the intraday optimization model creation module, so as to minimize the intraday loss and intraday voltage deviation of the distribution network system;

[0014] A real-time control strategy creation module is used to establish a time-series voltage amplitude sensitivity real-time control strategy based on the day-ahead hour-level optimization scheme and the intra-day minute-level optimization scheme;

[0015] A real-time optimization module, used for performing real-time reactive power compensation on the distribution network system according to the time sequence voltage amplitude sensitivity real-time control strategy;

[0016] The stability control module is used to control the stable operation of the timing voltage amplitude sensitivity real-time control strategy through a stability control circuit.

[0017] Furthermore, the stabilization control circuit comprises:

[0018] A single-chip microcomputer control unit, the single-chip microcomputer control unit includes a single-chip microcomputer IC, and the single-chip microcomputer model is STC15W201S, the VCC pin and the GND pin of the single-chip microcomputer IC are connected to the power line and the ground line respectively, and the VCC pin and the GND pin are connected through an inductor C2;

[0019] DM02 step-down unit, the DM02 step-down unit is connected to the high-low voltage conversion unit;

[0020] A high-low voltage conversion unit, wherein the high-low voltage conversion unit is connected to the single-chip microcomputer control unit, and the high-low voltage conversion unit is connected to the circuit input and output terminal block;

[0021] A switch unit, the switch unit is used to control the start-up of the stabilization control circuit;

[0022] A control unit, the control unit is connected to the single-chip microcomputer control unit, and the single-chip microcomputer control unit is also connected to the switch unit and the indication unit;

[0023] An indication unit, the indication unit is used to stabilize the control circuit and perform circuit startup indication;

[0024] A circuit input and output terminal block is connected to the control unit.

[0025] Further, the DM02 buck unit includes a DM02 buck module, the Vin+ end of the DM02 buck module is connected to the Vin+ end through a wire, the wire is connected to the VHO end through a diode D1, the Vin- end of the DM02 buck module is connected to the Vin+ and Vout- ends through a diode D3, the VOUT- end of the DM02 buck module is connected to the input end of the diode D3, the input end of the diode D3 is connected to the ground line, the VOUT+ end of the DM02 buck module is connected to the VOL end through a diode D2 and to the power line, the power line is connected to the ground line through a light-emitting diode 1 and a resistor R1, and the power line and the ground line are also connected through a capacitor C1.

[0026] Furthermore, the circuit input and output terminal row includes a Vin+ terminal, a Vin- terminal, a Vout+ terminal, and a Vout- terminal, and the terminal row also includes a Com terminal, and the terminal row is connected to a ground line.

[0027] Furthermore, the control unit includes a resistor R2 having one end connected to the power line, and the other end of the resistor R2 is connected to a resistor R3, the resistor R3 is connected to the ground line through a capacitor C5, and the positive electrode of the capacitor C5 is connected to the resistor R3, the resistor R3 and the capacitor C5 are both connected to the P3.2 pin of the microcontroller IC, the resistor R2 is connected to the resistor R3 through a wire, and the wire is connected to the Com end.

[0028] Further, the high-low voltage conversion unit includes a resistor R4 connected to the pin P5.5 of the single-chip computer and a resistor R5 connected to the pin P5.4 of the single-chip computer, the resistor R4 is connected to the b pin of the transistor Qhh, the resistor R5 is connected to the b pin of the transistor Qll, the c pin of the transistor Qhh and the c pin of the transistor Qll are connected to the power line, the e pin of the transistor Qhh is connected to the b pin of the transistor QH, the Qlle pin of the transistor is connected to the b pin of the transistor QL, the c pin of the transistor QH is connected to the VHO terminal, the c pin of the transistor QL is connected to the VLO terminal, the e pin of the transistor QH and the e pin of the transistor QL are both connected to the output end of the diode D4, and the output end of the diode D4 is connected to the Vout+ pin, and the input end of the diode D4 is connected to Vout-.

[0029] Furthermore, the switch unit includes a three-position combination switch SW, and multiple input terminals of the three-position combination switch SW are connected to the power line, and multiple output terminals of the three-position combination switch SW are connected to the P1.0, P1.1, and P1.2 pins of the microcontroller IC through pull-down resistors.

[0030] Furthermore, the indicating unit includes a light-emitting diode R and a light-emitting diode Y, and the input ends of the light-emitting diode R and the light-emitting diode Y are respectively connected to the P3.7 and P3.6 pins of the microcontroller, the output ends of the light-emitting diode R and the light-emitting diode Y are connected through a wire, and the wire is connected to the ground wire through a resistor R9.

[0031] Furthermore, the stabilization control circuit includes the following steps: controlling the VHO high voltage (VLO low voltage output) by controlling the 9013 transistor through the single-chip microcomputer pin in the high-low voltage conversion circuit, and at the same time, the three-bit combination switch SW is connected to the single-chip microcomputer pin through a pull-down resistor, which can provide a 3-bit encoding of a total of 8 high-voltage maintenance times. When the control terminal COM in the input and output terminal row JP is disconnected, the P3.2 pin is high level, and the QH and QL power tubes are both disconnected; there is no output; when COM is connected to the ground, the P3.2 pin is low level, QH turns on the high-voltage output, QH is disconnected according to the time set by SW, and QL turns on the low-voltage output.

[0032] Compared with the prior art, the present invention provides a distribution network reactive power compensation system, which controls the VHO high voltage or VLO low voltage output by controlling the 9013 triode through the single-chip microcomputer pin in the high-low voltage conversion circuit, and at the same time, the three-bit combination switch SW is connected to the single-chip microcomputer pin through a pull-down resistor, which can provide a 3-bit code with a total of 8 high voltage maintenance times. When the control terminal COM in the input and output terminal row JP is disconnected, the P32 pin is at a high level, and the QH and QL power tubes are both disconnected, and the stable control circuit has no output at this time; when COM is connected to the ground (Jp6), the P32 pin is at a low level, QH turns on the high voltage output, and after a period of time (according to the SW set time), QH is disconnected and QL is connected to the low voltage output; until COM is disconnected from the ground; QH and QL are both cut off, and the stable control circuit has no output at this time; when the distribution network circuit performs reactive compensation, it is switched to a lower voltage to maintain the reactive compensation of the distribution network circuit, thereby controlling energy costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0034] Figure 1 A schematic diagram of the overall structure of a stabilization control circuit provided by an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of a DM02 step-down unit circuit provided in an embodiment of the present invention;

[0036] Figure 3 A schematic diagram of a single chip control unit circuit provided by an embodiment of the present invention;

[0037] Figure 4 A schematic diagram of a switch unit circuit provided by an embodiment of the present invention;

[0038] Figure 5 A schematic diagram of a control unit circuit provided by an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of a high-to-low voltage conversion unit circuit provided by an embodiment of the present invention;

[0040] Figure 7 A schematic diagram of an indication unit circuit provided by an embodiment of the present invention;

[0041] Figure 8 A schematic diagram of a circuit input and output terminal block circuit provided by an embodiment of the present invention;

[0042] Fig. 9 This is a system flow diagram provided for an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0044] See also Figure 1-9 , a reactive power compensation system for a distribution network, comprising:

[0045] A distribution network system creation module is used to create a virtual distribution network system and introduce a flexible interconnection device composed of an intelligent soft switch and an energy storage element at the end of the created virtual distribution network system;

[0046] An operation optimization model creation module, used to establish an operation optimization model of a distribution network system having the flexible interconnection device, and the operation optimization model creation module is also used to determine whether the operation optimization model of the current distribution network system has changed;

[0047] A day-ahead optimization model creation module, the day-ahead optimization model creation module is used to receive the operation optimization model of the distribution network system established by the operation optimization model creation module and generate a day-ahead optimization model;

[0048] An intraday optimization model creation module, the intraday optimization model creation module is used to receive the operation optimization model of the distribution network system established by the operation optimization model creation module and generate an intraday optimization model;

[0049] The day-ahead optimization module is used to optimize the distribution network system at the hourly level by using the day-ahead optimization model created by the day-ahead optimization model creation module, so as to minimize the day-ahead loss of the distribution network system;

[0050] An intraday optimization module is used to optimize the distribution network system at the minute level within a day using the intraday optimization model created by the intraday optimization model creation module, so as to minimize the intraday loss and intraday voltage deviation of the distribution network system;

[0051] A real-time control strategy creation module is used to establish a time-series voltage amplitude sensitivity real-time control strategy based on the day-ahead hour-level optimization scheme and the intra-day minute-level optimization scheme;

[0052] A real-time optimization module, used for performing real-time reactive power compensation on the distribution network system according to the time sequence voltage amplitude sensitivity real-time control strategy;

[0053] The stability control module is used to control the stable operation of the timing voltage amplitude sensitivity real-time control strategy through a stability control circuit.

[0054] In this way, a virtual distribution network system is created through the distribution network system creation module, and a flexible interconnection device composed of an intelligent soft switch and an energy storage element is introduced at the end of the created virtual distribution network system. The operation optimization model of the distribution network system is established through the operation optimization model creation module according to the flexible interconnection device, and it is determined whether the operation optimization model of the current distribution network system has changed. If the operation optimization model of the current distribution network system has changed, a change request is sent to the stability control module. When the stability control module receives the change request sent by the operation optimization model creation module, the stability control module opens the communication interface to receive the timing voltage amplitude sensitivity real-time control strategy sent by the real-time optimization module. At the same time, the operation optimization model creation module sends the established operation optimization model of the distribution network system to the day-ahead optimization model creation module and the intraday optimization model creation module. When the day-ahead optimization model creation module and the intraday optimization model creation module respectively receive the change request from the operation optimization model creation module When the operation optimization model of the distribution network system of the block is generated, the day-ahead optimization model creation module and the intraday optimization model creation module generate the day-ahead optimization model and the intraday optimization model respectively, and the day-ahead optimization model and the intraday optimization model are transmitted to the day-ahead optimization module and the intraday optimization module respectively. The day-ahead optimization module uses the day-ahead optimization model to optimize the distribution network system at the hourly level the day-ahead to minimize the day-ahead loss of the distribution network system. The intraday optimization module uses the intraday optimization model to optimize the distribution network system at the minute-level within the day to minimize the intraday loss and intraday voltage deviation of the distribution network system. Then, the day-ahead hour-level optimization scheme and the intraday minute-level optimization scheme are transmitted to the real-time control strategy creation module. The real-time control strategy creation module establishes a time-series voltage amplitude sensitivity real-time control strategy based on the day-ahead hour-level optimization scheme and the intraday minute-level optimization scheme, and sends the time-series voltage amplitude sensitivity real-time control strategy to the stability control module to control the stable operation of the reactive power compensation scheme.

[0055] The stabilization control circuit includes a single-chip microcomputer control unit, a DM02 step-down unit, a high-low voltage conversion unit, a switch unit, a control unit, an indication unit and a circuit input-output terminal block. The single-chip microcomputer control unit includes a single-chip microcomputer IC, and the single-chip microcomputer model is STC15W201S. The VCC pin and the GND pin of the single-chip microcomputer IC are connected to the power line and the ground line respectively, and the VCC pin and the GND pin are connected through an inductor C2. The DM02 step-down unit is connected to the high-low voltage conversion unit, and the high-low voltage conversion unit is connected to the single-chip microcomputer control unit, and the high-low voltage conversion unit is connected to the circuit input-output terminal block, the control unit is connected to the single-chip microcomputer control unit, and the circuit input-output terminal block is connected to the control unit. The single-chip microcomputer control unit is also connected to a switch unit and an indication unit. The high-voltage driving low-voltage maintenance scheme can be implemented in different ways for different distribution network circuits. For small or micro distribution network circuits, we generally use single-chip microcomputer programming control. The programming can control the high voltage power-on time, which can be selected from 0.2 seconds to 5 seconds by toggle switch. In addition to the single-chip microcomputer, its main components also include a set of step-down circuits, high and low voltage switching circuits, and protection circuits.

[0056] Reactive compensation is performed by driving low voltage with high voltage, that is, applying a higher voltage when the distribution network circuit is energized so that the distribution network circuit obtains a larger power compensation; after the distribution network circuit performs reactive compensation, it is switched to a lower voltage to maintain the reactive compensation of the distribution network circuit.

[0057] Since the startup time of the distribution network is very short, ranging from a few hundred milliseconds to a few seconds under normal load conditions, the high voltage driving time does not need to be too long, and the distribution network circuit can almost achieve no heat. When the low voltage is maintained, the current is very small and the heat generation is extremely low. It can achieve the purpose of energy saving and improving the performance of the distribution network circuit. The distribution network circuit that originally required a large volume to meet the demand can be designed to be very small to meet the demand. Save materials, save production time, save costs, and reduce prices. Generally speaking

[0058]

[0059]

[0060] For the existing power distribution network circuit, the internal resistance is fixed. If the voltage is reduced by one time, the current will be reduced by one time, and the power can be reduced by four times.

[0061] In the high-low voltage conversion circuit, P54 and P55 are microcontroller pins that control the VHO high voltage or VLO low voltage output by controlling the 9013 transistor. SW is a three-position combination switch, which is connected to the microcontroller pin through a pull-down resistor. It can provide a 3-bit code for a total of 8 high-voltage maintenance times. JP is the input and output terminal block of the circuit, and COM is the control terminal. When disconnected, the P32 pin is high level, and the QH and QL power tubes are both disconnected. At this time, the stable control circuit has no output; when COM is connected to the ground (Jp6), the P32 pin is low level, and QH turns on the high-voltage output. After a period of time (according to the time set by SW), QH is disconnected and QL turns on the low-voltage output; until COM is disconnected from the ground; QH and QL are both cut off, and the stable control circuit has no output.

[0062] The DM02 buck unit includes a DM02 buck module, the Vin+ end of the DM02 buck module is connected to the Vin+ end through a wire, the wire is connected to the VHO end through a diode D1, the Vin- end of the DM02 buck module is connected to the Vin+ and Vout- ends through a diode D3, the VOUT- end of the DM02 buck module is connected to the input end of the diode D3, the input end of the diode D3 is connected to the ground wire, the VOUT+ end of the DM02 buck module is connected to the VOL end through a diode D2 and to the power line, the power line and the ground line are connected through a light-emitting diode 1 and a resistor R1, and the power line and the ground line are also connected through a capacitor C1, and the circuit uses an external power supply DC24V as a high voltage; DC5V is output through the DM02 buck module to power the control parts such as the single-chip microcomputer, and DC5V is also used as a low-voltage maintenance voltage to power the distribution network circuit.

[0063] The circuit input and output terminal block includes Vin+ terminal, Vin- terminal, Vout+ terminal, Vout- terminal, and Com terminal. The terminal block is connected to the ground wire, and the circuit input and output terminal block is connected to the power distribution network circuit.

[0064] The control unit includes a resistor R2 whose one end is connected to the power line, and the other end of the resistor R2 is connected to a resistor R3, the resistor R3 is connected to the ground line through a capacitor C5, and the positive electrode of the capacitor C5 is connected to the resistor R3, the resistor R3 and the capacitor C5 are both connected to the P3.2 pin of the microcontroller IC, the resistor R2 is connected to the resistor R3 through a wire, and the wire is connected to the Com end.

[0065] The high-low voltage conversion unit includes a resistor R4 connected to the P5.5 pin of the single-chip computer and a resistor R5 connected to the P5.4 pin of the single-chip computer. The resistor R4 is connected to the b pin of the transistor Qhh, and the resistor R5 is connected to the b pin of the transistor Qll. The c pin of the transistor Qhh and the c pin of the transistor Qll are connected to the power line, the e pin of the transistor Qhh is connected to the b pin of the transistor QH, the Qlle pin of the transistor is connected to the b pin of the transistor QL, the c pin of the transistor QH is connected to the VHO terminal, the c pin of the transistor QL is connected to the VLO terminal, the e pin of the transistor QH and the e pin of the transistor QL are both connected to the output end of the diode D4, and the output end of the diode D4 is connected to the Vout+ pin, and the input end of the diode D4 is connected to Vout-.

[0066] The switch unit includes a three-position combination switch SW, and multiple input ends of the three-position combination switch SW are connected to the power line, and multiple output ends of the three-position combination switch SW are respectively connected to the P1.0, P1.1, and P1.2 pins of the microcontroller IC through pull-down resistors. The three-position combination switch SW is connected to the microcontroller pin through a pull-down resistor, and a total of 8 high-voltage maintenance times can be provided with 3-bit coding.

[0067] The indicating unit includes a light-emitting diode R and a light-emitting diode Y, and the input ends of the light-emitting diode R and the light-emitting diode Y are respectively connected to the P3.7 and P3.6 pins of the microcontroller, and the output ends of the light-emitting diode R and the light-emitting diode Y are connected through a wire, and the wire is connected to the ground wire through a resistor R9.

[0068] The method comprises the following steps: controlling the VHO high voltage (VLO low voltage output) by controlling the 9013 triode through the single chip microcomputer pin in the high-low voltage conversion circuit, and at the same time, the three-bit combination switch SW is connected to the single chip microcomputer pin through a pull-down resistor, which can provide a 3-bit encoding of a total of 8 high voltage maintenance times. When the control terminal COM in the input and output terminal row JP is disconnected, the P3.2 pin is at a high level, and both the QH and QL power tubes are disconnected; there is no output; when COM is connected to the ground, the P3.2 pin is at a low level, QH turns on the high voltage output, QH is disconnected according to the time set by SW, and QL turns on the low voltage output.

[0069] In this way, by setting the high and low voltage conversion circuit, P54 and P55 are the microcontroller pins, which control the VHO high voltage or VLO low voltage output by controlling the 9013 transistor. SW is a three-position combination switch, which is connected to the microcontroller pin through a pull-down resistor. It can provide 3-bit coding and a total of 8 high voltage maintenance times. JP is the input and output terminal row of the circuit, COM is the control terminal, and when disconnected, the P32 pin is high level, and the QH and QL power tubes are both disconnected. At this time, the stable control circuit has no output; when COM is connected to the ground (Jp6), the P32 pin is low level, and QH turns on the high voltage output. After a period of time (according to the time set by SW), QH is disconnected and QL is connected to the low voltage output; until COM is disconnected from the ground; QH and QL are both cut off, and the stable control circuit has no output.

[0070] Working principle: When in use, P54 and P55 in the high-low voltage conversion circuit are microcontroller pins that control the VHO high voltage or VLO low voltage output by controlling the 9013 transistor. SW is a three-position combination switch, which is connected to the microcontroller pin through a pull-down resistor. It can provide 3-bit coding for a total of 8 high-voltage maintenance times. JP is the input and output terminal block of the circuit, and COM is the control terminal. When disconnected, the P32 pin is high level, and the QH and QL power tubes are both disconnected. At this time, the stable control circuit has no output; when COM is connected to the ground (Jp6), the P32 pin is low level, and QH turns on the high-voltage output. After a period of time (according to the time set by SW), QH is disconnected and QL turns on the low-voltage output; until COM is disconnected from the ground; QH and QL are both cut off, and the stable control circuit has no output.

[0071] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A reactive power compensation system for a distribution network, characterized in that: include: A distribution network system creation module is used to create a virtual distribution network system and introduce a flexible interconnection device composed of an intelligent soft switch and an energy storage element at the end of the created virtual distribution network system; An operation optimization model creation module, used to establish an operation optimization model of a distribution network system having the flexible interconnection device, and the operation optimization model creation module is also used to determine whether the operation optimization model of the current distribution network system has changed; A day-ahead optimization model creation module, the day-ahead optimization model creation module is used to receive the operation optimization model of the distribution network system established by the operation optimization model creation module and generate a day-ahead optimization model; An intraday optimization model creation module, the intraday optimization model creation module is used to receive the operation optimization model of the distribution network system established by the operation optimization model creation module and generate an intraday optimization model; The day-ahead optimization module is used to optimize the distribution network system at the hourly level by using the day-ahead optimization model created by the day-ahead optimization model creation module, so as to minimize the day-ahead loss of the distribution network system; An intraday optimization module is used to optimize the distribution network system at the minute level within a day using the intraday optimization model created by the intraday optimization model creation module, so as to minimize the intraday loss and intraday voltage deviation of the distribution network system; A real-time control strategy creation module is used to establish a time-series voltage amplitude sensitivity real-time control strategy based on the day-ahead hour-level optimization scheme and the intra-day minute-level optimization scheme; A real-time optimization module, used for performing real-time reactive power compensation on the distribution network system according to the time sequence voltage amplitude sensitivity real-time control strategy; A stability control module, used to control the stable operation of the timing voltage amplitude sensitivity real-time control strategy through a stability control circuit; The stabilization control circuit comprises: A single-chip microcomputer control unit, the single-chip microcomputer control unit includes a single-chip microcomputer IC, and the single-chip microcomputer model is STC15W201S, the VCC pin and the GND pin of the single-chip microcomputer IC are connected to the power line and the ground line respectively, and the VCC pin and the GND pin are connected through an inductor C2; DM02 step-down unit, the DM02 step-down unit is connected to the high-low voltage conversion unit; A high-low voltage conversion unit, wherein the high-low voltage conversion unit is connected to the single-chip microcomputer control unit, and the high-low voltage conversion unit is connected to the circuit input and output terminal block; A switch unit, the switch unit is used to control the start-up of the stabilization control circuit; A control unit, the control unit is connected to the single-chip microcomputer control unit, and the single-chip microcomputer control unit is also connected to the switch unit and the indication unit; An indication unit, the indication unit is used to stabilize the control circuit and perform circuit startup indication; A circuit input and output terminal block, the circuit input and output terminal block is connected to the control unit; The DM02 buck unit includes a DM02 buck module, the Vin+ end of the DM02 buck module is connected to the Vin+ end through a wire, the wire is connected to the VHO end through a diode D1, the Vin- end of the DM02 buck module is connected to the Vin+ and Vout- ends through a diode D3, the VOUT- end of the DM02 buck module is connected to the input end of the diode D3, the input end of the diode D3 is connected to the ground line, the VOUT+ end of the DM02 buck module is connected to the VOL end through a diode D2 and to the power line, the power line is connected to the ground line through a light emitting diode 1 and a resistor R1, and the power line and the ground line are also connected through a capacitor C1; The control unit includes a resistor R2 whose one end is connected to the power line, and the other end of the resistor R2 is connected to a resistor R3, the resistor R3 is connected to the ground line through a capacitor C5, and the positive electrode of the capacitor C5 is connected to the resistor R3, the resistor R3 and the capacitor C5 are both connected to the P3.2 pin of the single-chip IC, the resistor R2 is connected to the resistor R3 through a wire, and the wire is connected to the Com terminal; The high-low voltage conversion unit includes a resistor R4 connected to the pin P5.5 of the single-chip computer and a resistor R5 connected to the pin P5.4 of the single-chip computer. The resistor R4 is connected to the b pin of the transistor Qhh, and the resistor R5 is connected to the b pin of the transistor Qll. The c pin of the transistor Qhh and the c pin of the transistor Qll are connected to the power line, the e pin of the transistor Qhh is connected to the b pin of the transistor QH, the Qlle pin of the transistor is connected to the b pin of the transistor QL, the c pin of the transistor QH is connected to the VHO end, the c pin of the transistor QL is connected to the VLO end, the e pin of the transistor QH and the e pin of the transistor QL are both connected to the output end of the diode D4, and the output end of the diode D4 is connected to the Vout+ pin, and the input end of the diode D4 is connected to Vout-.

2. A reactive power compensation system for distribution network according to claim 1, characterized in that: The circuit input and output terminal row includes a Vin+ terminal, a Vin- terminal, a Vout+ terminal, and a Vout- terminal. The terminal row also includes a Com terminal. The terminal row is connected to a ground line.

3. A reactive power compensation system for distribution network according to claim 2, characterized in that: The switch unit includes a three-position combination switch SW, and multiple input terminals of the three-position combination switch SW are connected to the power line, and multiple output terminals of the three-position combination switch SW are connected to the P1.0, P1.1, and P1.2 pins of the single-chip microcomputer IC through pull-down resistors.

4. A reactive power compensation system for distribution network according to claim 3, characterized in that: The indicating unit includes a light-emitting diode R and a light-emitting diode Y, and the input ends of the light-emitting diode R and the light-emitting diode Y are respectively connected to the P3.7 and P3.6 pins of the single-chip computer, and the output ends of the light-emitting diode R and the light-emitting diode Y are connected through a wire, and the wire is connected to the ground wire through a resistor R9.

5. A reactive power compensation system for distribution network according to claim 4, characterized in that: The stability control circuit includes the following steps: controlling the VHO high voltage and VLO low voltage output by controlling the 9013 transistor through the single-chip microcomputer pin in the high-low voltage conversion circuit, and at the same time, the three-bit combination switch SW is connected to the single-chip microcomputer pin through a pull-down resistor, which can provide a 3-bit encoding and a total of 8 high voltage maintenance times. When the control terminal COM in the input and output terminal row JP is disconnected, the P3.2 pin is high level, and the QH and QL power tubes are both disconnected, and there is no output at this time; when COM is connected to the ground, the P3.2 pin is low level, QH turns on the high voltage output, QH is disconnected according to the time set by SW, and QL is connected to the low voltage output.

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