A low-voltage power distribution network flexible voltage regulation method and system

Abstract

The application discloses a low-voltage power distribution network flexible voltage regulation method and system, wherein the method comprises the following steps: S1: AC / DC converters C_n (n=1, 2,..., N) are connected in parallel on the low-voltage AC power distribution network on the AC side and connected in parallel on the DC line on the DC side, the AC / DC converter C_1 is close to the power supply side and starts to operate in the DC constant voltage control mode, and the AC / DC converters C_n (n=2,..., N) start to operate in the constant power control mode; S2: the AC / DC converters C_n (n=2,..., N) collect the AC side voltage; if the AC side voltage is lower than the lower limit of the set voltage threshold, the AC / DC converter sends active power to the AC line; if the AC side voltage is higher than the upper limit of the set voltage threshold, the AC / DC converter absorbs active power from the AC line; and if the AC side voltage is within the set threshold range, the AC / DC converter is in the standby state. The application solves the problems of low voltage, line overload and overvoltage caused by long-distance low-voltage power distribution network and distributed photovoltaic.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of intelligent power distribution, and particularly relates to a low-voltage power distribution network flexible voltage regulation method and system. BACKGROUND

[0002] The low-voltage power distribution network is at the end of the power grid. Due to long lines, seasonal load fluctuations and other reasons, the problem of low voltage of users has existed for a long time. The widespread access of distributed photovoltaics in the low-voltage power distribution network gradually highlights the problem of overvoltage due to the inability to consume and send the substation on site. Voltage quality is a key factor affecting the user's power experience, and voltage quality improvement is an important work goal of power supply companies. Influenced by factors such as seasonal load fluctuations and distributed photovoltaic access, methods such as voltage regulating transformers and reactive power compensators cannot meet the demand for bidirectional voltage regulation, and voltage bidirectional over-limit control is gradually increasing in difficulty.

[0003] A Chinese patent with publication number CN115912492A discloses a power distribution network grid connection point voltage control method considering large-scale distributed power supply, and particularly relates to the technical field of electric power control. The method comprises: obtaining the voltage value of the public grid connection point, the active power and the reactive power of each distributed power supply flowing into the public grid connection point; when the difference between the voltage value of the public grid connection point and the reference voltage is greater than the first threshold value, calculating the reactive power output limit value connected to each distributed power supply; according to the difference between the voltage value of the public grid connection point and the reference voltage, obtaining the total amount of reactive power control; and adjusting the reactive power control instruction of each power supply branch according to the total amount of reactive power control and the reactive power output limit value of each distributed power supply, so as to control each distributed power supply to respond to the reactive power output according to the adjusted reactive power control instruction. Although the invention can theoretically realize bidirectional voltage regulation of the power distribution network, it mainly focuses on voltage adjustment of the public grid connection point and cannot directly and independently adjust the load sub-point. Moreover, the adjustment of the reactive power of the distributed power supply may have a response delay. Rapidly changing loads and generation conditions may cause the voltage regulation to be not timely enough, thereby affecting the voltage stability. SUMMARY

[0004] The application provides a low-voltage power distribution network flexible voltage regulation method and system, aiming to solve the problems of low voltage caused by long distance, line overload, and overvoltage caused by distributed photovoltaics in the low-voltage power distribution network.

[0005] To solve the above technical problems, the application provides a low-voltage power distribution network flexible voltage regulation method, comprising the following steps:

[0006] S1: AC side of AC / DC converter C_n (n=1, 2, …, N) is connected in parallel to the low-voltage AC power distribution network, and the DC side is connected in parallel to the DC line; the AC / DC converter C_1 is close to the power supply side and starts to operate in the DC constant voltage control mode, and the AC / DC converters C_n (n=2, …, N) start to operate in the constant power control mode.

[0007] S2: AC / DC converter C_n(n=2,…,N) collects AC side voltage U C_n (n=2,…,N); if AC side voltage U C_n (n=2,…,N) is lower than the lower limit of the set voltage threshold U down , AC / DC converter C_n(n=2,…,N) sends active power P C_n (n=2,…,N) to the AC line; if AC side voltage U C_n (n=2,…,N) is higher than the upper limit of the set voltage threshold U up , AC / DC converter C_n(n=2,…,N) absorbs active power P C_n (n=2,…,N) from the AC line; if the AC side voltage is within the set threshold range, i.e. U C_n (n=2,…,N)∈[U up ,U down ], AC / DC converter C_n(n=2,…,N) is in standby state.

[0008] Preferably, the active power of the DC converter should meet:

[0009]

[0010] In the formula, P C_n is the active power flowing into the DC line of AC / DC converter n, N is the number of AC / DC converters, P loss is the loss of the DC line, and t is the time.

[0011] Preferably, the size of the active power P_n sent or absorbed by the AC / DC converter, n=2,…,N, should meet:

[0012]

[0013] In the formula, P C_n is the active power; ΔU is the difference between AC side voltage U C_n (n=2,…,N) of AC / DC converter C_n(n=2,…,N) and the upper limit or lower limit of the set voltage threshold; and r is the AC line resistance between the grid-connected point of AC / DC converter C_n(n=2,…,N) and the first end of the transformer area.

[0014] Preferably, the remote grid connection and power control of the AC / DC converter is specifically:

[0015] The AC / DC converters communicate with each other through DC carrier.

[0016] The AC-DC converter C_1 obtains the operation state and data of the AC-DC converter C_n (n=2,...,N) and sends them to the edge computing terminal through an AC carrier communication mode.

[0017] The AC-DC converter C_1 receives the control instruction sent by the edge computing terminal and realizes remote off-grid and power control of the AC-DC converter C_n (n=2,...,N).

[0018] Preferably, the remote off-grid control of the AC-DC converter is specifically as follows:

[0019] The edge computing terminal issues an off-grid control instruction.

[0020] The AC-DC converter C_1 receives the off-grid control instruction and issues the off-grid control instruction to the AC-DC converter C_n (n=2,...,N).

[0021] The AC-DC converter C_n (n=2,...,N) receives the off-grid control instruction, stops power output, and transmits a shutdown signal to the AC-DC converter C_1.

[0022] The AC-DC converter C_1 receives the shutdown signal and stops when detecting that the DC side power is zero.

[0023] On the other hand, the application provides a low-voltage power distribution network flexible voltage regulation system, which comprises a configuration module and a voltage regulation module.

[0024] The configuration module is used for connecting the AC side of the AC-DC converter C_n (n=1,2,...,N) in parallel to a low-voltage AC power distribution network and connecting the DC side in parallel to a DC line, the AC-DC converter C_1 is close to a power supply side and starts to operate in a DC constant voltage control mode, and the AC-DC converter C_n (n=2,...,N) is started to operate in a constant power control mode.

[0025] The voltage regulation module is used for discriminating and regulating the AC side voltage U C_n (n=2,...,N) collected by the AC-DC converter C_n (n=2,...,N); if the AC side voltage U C_n (n=2,...,N) is lower than a set lower limit U down of a voltage threshold, the AC-DC converter C_n (n=2,...,N) sends active power P C_n (n=2,...,N) to an AC line; if the AC side voltage U C_n (n=2,...,N) is higher than a set upper limit U up of a voltage threshold, the AC-DC converter C_n (n=2,...,N) absorbs active power P C_n (n=2,...,N) from the AC line; and if the AC side voltage is within a set threshold range, i.e., U C_n(n = 2, …, N) ∈ [U up ,U down ], the AC-DC converter C_n (n = 2, …, N) is in standby state.

[0026] Preferably, the active power of the AC-DC converter in the configuration module should meet:

[0027]

[0028] In the formula, P C_n is the active power flowing into the DC line of the AC-DC converter n, N is the number of AC-DC converters, P loss is the loss of the DC line, and t is the time.

[0029] Preferably, the AC-DC converter in the voltage regulation module emits or absorbs active power P_n, n = 2, …, N, which should meet:

[0030]

[0031] In the formula, P C_n is the active power; ΔU is the difference between the AC side voltage U C_n (n = 2, …, N) of the AC-DC converter C_n (n = 2, …, N) and the set upper voltage threshold or lower voltage threshold; and r is the AC line resistance between the grid connection point of the AC-DC converter C_n (n = 2, …, N) and the first end of the transformer area.

[0032] Preferably, the voltage regulation module can also realize remote off-grid and power control of the AC-DC converter, specifically:

[0033] The AC-DC converters communicate with each other through DC carrier.

[0034] The AC-DC converter C_1 obtains the operating state and data of the AC-DC converter C_n (n = 2, …, N) and uploads them to the edge computing terminal through AC carrier communication mode.

[0035] The AC-DC converter C_1 receives the control instructions sent by the edge computing terminal to realize remote off-grid and power control of the AC-DC converter C_n (n = 2, …, N).

[0036] The AC-DC converter realizes remote off-grid control specifically as follows:

[0037] The edge computing terminal issues off-grid control instructions.

[0038] The AC-DC converter C_1 receives the off-grid control instructions and issues off-grid control instructions to the AC-DC converter C_n (n = 2, …, N).

[0039] The AC-DC converter C_n (n=2,...,N) receives the off-grid control instruction, stops power output, and transmits a shutdown signal to the AC-DC converter C_1.

[0040] The AC-DC converter C_1 receives the shutdown signal and stops when detecting that the DC side power is zero.

[0041] In another aspect, the present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the low-voltage power distribution network flexible voltage regulation method according to any one of the embodiments of the present application when executing the computer program.

[0042] In another aspect, the present application also provides a computer readable storage medium having a computer program stored thereon, wherein the computer program is executable by a processor to implement the low-voltage power distribution network flexible voltage regulation method according to any one of the embodiments of the present application.

[0043] Compared with the prior art, the present application has the following technical effects:

[0044] The low-voltage power distribution network flexible voltage regulation method and system according to the present application ensure the stability of the DC side voltage by operating the DC converter close to the power supply side in a DC constant voltage control mode, thereby providing basic stability for the system; the other AC-DC converters are operated in a constant power control mode, which can be adjusted according to the real-time changes of the AC side voltage, thereby effectively responding to load fluctuations and grid imbalance. The real-time voltage monitoring and regulation mechanism improves the response capability of the system to various power loads and external disturbances, thereby improving the overall reliability and operational flexibility of the power distribution network. The problems of low voltage caused by long-distance low-voltage power distribution network, line overload, and overvoltage caused by distributed photovoltaic power can be effectively solved, thereby improving the power supply capacity and voltage quality of the low-voltage power distribution network. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is the overall flowchart of the low-voltage power distribution network flexible voltage regulation method according to the present application;

[0046] Figure 2 is a schematic diagram of the line connection of the AC-DC converter according to the present application;

[0047] Figure 3 is a control structure diagram of the AC-DC converter C_1 according to the present application;

[0048] Figure 4 is a control structure diagram of the AC-DC converter C_n (n=2,...,N) according to the present application;

[0049] Figure 5 is the overall flowchart of the remote off-grid control of the AC-DC converter according to the present application;

[0050] Figure 6 is the input voltage and current waveform diagram of the AC-DC converter C_1 described in the present application;

[0051] Figure 7 is the output voltage and current waveform diagram of the AC-DC converter C_2 described in the present application. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below in combination with specific embodiments of the present application and with reference to the accompanying drawings.

[0053] Embodiment One

[0054] The present embodiment provides a low-voltage power distribution network flexible voltage regulation method, as shown in Figure 1 , including the following steps:

[0055] S1: as shown in Figure 2 , the AC side of the AC-DC converter C_n (n = 1, 2, …, N) is connected in parallel to the low-voltage AC power distribution network, and the DC side is connected in parallel to the DC line. The AC-DC converter C_1 is close to the power supply side and starts to operate in the DC constant voltage control mode to ensure the stability of the DC side. The AC-DC converters C_n (n = 2, …, N) are started to operate in the constant power control mode.

[0056] S2: the AC-DC converter C_n (n = 2, …, N) collects the AC side voltage U C_n (n = 2, …, N); if the AC side voltage U C_n (n = 2, …, N) is lower than the set lower limit of the voltage threshold U down , the AC-DC converter C_n (n = 2, …, N) sends the active power P C_n (n = 2, …, N) to the AC line; if the AC side voltage U C_n (n = 2, …, N) is higher than the set upper limit of the voltage threshold U up , the AC-DC converter C_n (n = 2, …, N) absorbs the active power P C_n (n = 2, …, N) from the AC line; if the AC side voltage is within the set threshold range, i.e. U C_n (n = 2, …, N) ∈ [U up , U down ], the AC-DC converter C_n (n = 2, …, N) is in standby state. The AC-DC converter calculates the size of the active power P C_n (n = 2, …, N) sent or absorbed on site to realize real-time regulation of the AC side voltage.

[0057] As a preferred embodiment of the present embodiment, reference is made toFigure 3 、 4 The control structure diagram of the AC / DC converter C_n (n = 1, 2, …, N) is shown in FIG. 2. The AC / DC converter C_n (n = 1, 2, …, N) adopts a double closed-loop control structure, i.e., a voltage outer loop and a current inner loop. The voltage outer loop of the AC / DC converter C_1 adopts PI control to realize DC bus voltage stabilization and voltage equalization control. To improve the output steady-state accuracy of the AC / DC converter C_n (n = 2, …, N) and reduce the grid voltage interference, the voltage outer loop can adopt a quasi-PR control method to realize accurate regulation of the terminal output voltage, harmonic component suppression, etc. To improve the stability of system control and the dynamic response of the load, the current inner loop of the AC / DC converter C_n (n = 1, 2, …, N) can adopt a hysteresis control method.

[0058] As a preferred embodiment of the present embodiment, the active power of the DC converter should satisfy:

[0059]

[0060] In the formula, P C_n is the active power of the AC / DC converter n flowing into the DC line, N is the number of AC / DC converters, P loss is the loss of the DC line, and t is the time.

[0061] As a preferred embodiment of the present embodiment, before the low-voltage distribution network flexible voltage regulation system is connected, the grid-connected point voltage of the AC / DC converter is:

[0062]

[0063] In the formula, U C_n is the grid-connected point voltage of the AC / DC converter; U o is the grid-connected point voltage of the AC / DC converter C_1; r and x are the resistance and reactance of the AC line between the grid-connected point of the AC / DC converter C_n (n = 1, 2, …, N) and the first end of the transformer area; P L and Q L are the active power and reactive power of the user.

[0064] After the low-voltage distribution network flexible voltage regulation system is connected, the grid-connected point voltage of the AC / DC converter is:

[0065]

[0066] In the formula, P and Q are the active power and reactive power of the AC line.

[0067] Therefore, the AC / DC converter emits or absorbs the active power P_n, n = 2, …, N, which should satisfy:

[0068]

[0069] wherein P C_n is the active power; ΔU is the difference between the voltage U C_n at the AC side of the AC / DC converter C_n (n = 2, …, N) and the set upper voltage threshold or lower voltage threshold; r is the AC line resistance between the grid connection point of the AC / DC converter C_n (n = 2, …, N) and the head end of the transformer district.

[0070] As a preferred embodiment of the present embodiment, the AC / DC converter realizes remote off-grid and power control through the edge computing terminal. Combined with the intelligent decision-making ability of the edge computing terminal and the automatic response of the AC / DC converter, more efficient and intelligent power management and control can be realized, which is suitable for complex and variable power demand and environmental conditions. Specifically:

[0071] The AC / DC converters communicate with each other through DC carrier.

[0072] The AC / DC converter C_1 obtains the operating state and data of the AC / DC converter C_n (n = 2, …, N) and uploads them to the edge computing terminal through AC carrier communication.

[0073] The AC / DC converter C_1 receives the control instructions sent by the edge computing terminal to realize remote off-grid and power control of the AC / DC converter C_n (n = 2, …, N).

[0074] Through the control instructions issued by the edge computing terminal, the AC / DC converter C_1 can centrally manage and optimize the off-grid and power output of other converters. This centralized control helps to coordinate the operation of different AC / DC converters and ensures the stability and efficiency of the whole system.

[0075] As a preferred embodiment of the present embodiment, the AC / DC converter realizes remote off-grid control, specifically:

[0076] The edge computing terminal issues off-grid control instructions.

[0077] The AC / DC converter C_1 receives the off-grid control instructions and issues off-grid control instructions to the AC / DC converter C_n (n = 2, …, N).

[0078] The AC / DC converter C_n (n = 2, …, N) receives the off-grid control instructions, stops power output, and transmits a shutdown signal to the AC / DC converter C_1.

[0079] The AC / DC converter C_1 receives the shutdown signal and detects that the DC side power is zero, and then shuts down.

[0080] Through the orderly off-grid control process, each AC-DC converter stops power output and sends a shutdown signal after receiving the off-grid instruction, and the AC-DC converter C_1 stops only after confirming that all AC-DC converters stop working, so as to improve safety and stability.

[0081] In order to verify the effectiveness and superiority of the method provided in the embodiment, the following provides some specific cases:

[0082] The experimental environment is configured as two AC-DC converters (each with a rated power of 50kW), the AC side voltage is 380V, and the user load is switched by 10kW. The test verifies that the method provided in the embodiment can realize grid side voltage control under load change and maintain grid voltage stability. Referring to FIGS. 1-2, the input voltage and current waveforms of the AC-DC converter C_1 and the output voltage and current waveforms of the AC-DC converter C_2 of the low-voltage distribution network flexible voltage regulation system in the test when the user load is increased by 10kW are shown. Figure 6 Figure 7 The input voltage and current waveforms of the AC-DC converter C_1 and the output voltage and current waveforms of the AC-DC converter C_2 of the low-voltage distribution network flexible voltage regulation system in the test when the user load is increased by 10kW are shown.

[0083] Embodiment Two

[0084] Correspondingly, the embodiment provides a low-voltage distribution network flexible voltage regulation system, which comprises a configuration module and a voltage regulation module.

[0085] The configuration module is configured to connect the AC side of the AC-DC converter C_n (n=1, 2, …, N) in parallel to the low-voltage AC distribution network and the DC side in parallel to the DC line, the AC-DC converter C_1 is close to the power supply side and starts to operate in the DC constant voltage control mode, and the AC-DC converter C_n (n=2, …, N) starts to operate in the constant power control mode. This module is used to realize the function of step S1 in embodiment one, and will not be described here.

[0086] The voltage regulation module is configured to distinguish and regulate the AC side voltage U C_n (n=2, …, N) collected by the AC-DC converter C_n (n=2, …, N); if the AC side voltage U C_n (n=2, …, N) is lower than the lower limit U down of the set voltage threshold, the AC-DC converter C_n (n=2, …, N) sends active power P C_n (n=2, …, N) to the AC line; if the AC side voltage U C_n (n=2, …, N) is higher than the upper limit U up of the set voltage threshold, the AC-DC converter C_n (n=2, …, N) absorbs active power P C_n (n=2, …, N) from the AC line; if the AC side voltage is within the set threshold range, i.e. U C_n (n=2, …, N) ∈ [U up , U down ​The AC-DC converter C_n (n=2, …, N) is in standby state, and the module is used to realize the function of step S2 in embodiment one, and details are not described herein.

[0087] Embodiment three

[0088] The embodiment provides an electronic device, which comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor realizes the low-voltage power distribution network flexible voltage regulation method according to any embodiment of the application when executing the computer program.

[0089] Embodiment four

[0090] The embodiment provides a computer readable storage medium, which stores a computer program, and the computer program realizes the low-voltage power distribution network flexible voltage regulation method according to any embodiment of the application when executed by a processor.

[0091] In the embodiments of the present application, "at least one" means one or more, and "multiple" means two or more. The "and / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent the cases of A alone, A and B together, and B alone. Wherein A and B can be singular or plural. The character " / " generally represents an "or" relationship between the front and rear associated objects. "At least one of the following" and the like means any combination of these items, including any combination of single or multiple items. For example, at least one of a, b and c can represent: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b, and c can be single or multiple.

[0092] Those of ordinary skill in the art can realize that the units and algorithm steps described in the embodiments disclosed herein can be realized by electronic hardware, computer software and a combination of electronic hardware and computer software. Whether the functions are realized in hardware or software mode depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0093] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the above-mentioned system, device and unit can refer to the corresponding process in the foregoing method embodiments, and details are not described herein.

[0094] In several embodiments provided in the present application, any function, if realized in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application or the parts of the technical solutions that essentially contribute to the prior art or the parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present application. The aforementioned storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0095] The above description is only some embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, based on the content of the specification and drawings of the present application, are also included in the patent protection scope of the present application.

Claims

1. A flexible voltage regulation method for a low-voltage distribution network, characterized in that: The following steps are involved: S1: AC / DC converter The AC side is connected in parallel to the low voltage AC distribution network, and the DC side is connected in parallel to the DC line. Close to the power supply side and start it to run in DC constant voltage control mode, start the AC-DC converter Run in constant power control mode; S2: AC / DC converter Collect AC side voltage If the AC side voltage Below the set voltage threshold , AC-DC converter Sending active power to the AC line If the AC side voltage Higher than the set voltage threshold , AC-DC converter Absorb active power from the AC line If the AC side voltage is within the set threshold range, , AC-DC converter In standby mode; The active power of the AC / DC converter should meet the following requirements: Where, AC-DC converter The active power flowing into the DC link, is the number of AC / DC converters, is the loss of the DC line, For the moment; The AC / DC converter realizes remote off-grid connection and power control specifically as follows: The AC / DC converters communicate with each other via a DC carrier; The AC-DC converter Get AC / DC converter The operating status and data are sent to the edge computing terminal via AC carrier communication; The AC-DC converter Receive control instructions sent by the edge computing terminal to realize the AC / DC converter Remote off-grid and power control; The AC / DC converter realizes remote off-grid control specifically as follows: The edge computing terminal issues off-grid control instructions; AC / DC converter Receives off-grid control instructions and sends the AC / DC converter Issue off-grid control instructions; AC / DC converter Upon receiving the off-grid control command, the power output is stopped and the shutdown signal is transmitted to the AC / DC converter. ; AC / DC converter When receiving the shutdown signal and detecting that the DC side power is zero, the machine shuts down.

2. The low-voltage distribution network flexible voltage regulation method according to claim 1, characterized in that: The AC / DC converter emits or absorbs active power , Size should meet the following requirements: Where, is the active power; AC-DC converter AC side voltage The difference from the set upper voltage threshold or lower voltage threshold; AC-DC converter The AC line resistance between the grid connection point and the head end of the substation.

3. A flexible voltage regulation system for a low-voltage distribution network, characterized in that: Including configuration module and voltage regulation module; Configuration module for converting AC / DC converter The AC side is connected in parallel to the low voltage AC distribution network, and the DC side is connected in parallel to the DC line. Close to the power supply side and start it to run in DC constant voltage control mode, start the AC-DC converter Runs in constant power control mode; Voltage regulation module for AC / DC converter Collected AC side voltage Make judgment and adjustment; if the AC side voltage Below the set voltage threshold , AC-DC converter Sending active power to the AC line If the AC side voltage Higher than the set voltage threshold , AC-DC converter Absorb active power from the AC line If the AC side voltage is within the set threshold range, , AC-DC converter In standby mode; The active power of the AC / DC converter in the configuration module should meet the following requirements: Where, AC-DC converter The active power flowing into the DC link, is the number of AC / DC converters, is the loss of the DC line, For the moment; The voltage regulation module can also realize remote off-grid and power control of the AC / DC converter, specifically: The AC / DC converters communicate with each other via a DC carrier; The AC-DC converter Get AC / DC converter The operating status and data are sent to the edge computing terminal via AC carrier communication; The AC-DC converter Receive control instructions sent by the edge computing terminal to realize the AC / DC converter Remote off-grid and power control; The AC / DC converter realizes remote off-grid control specifically as follows: The edge computing terminal issues off-grid control instructions; AC / DC converter Receives off-grid control instructions and sends the AC / DC converter Issue off-grid control instructions; AC / DC converter Upon receiving the off-grid control command, the power output is stopped and the shutdown signal is transmitted to the AC / DC converter. ; AC / DC converter When receiving the shutdown signal and detecting that the DC side power is zero, the machine shuts down.

4. The low-voltage distribution network flexible voltage regulation system according to claim 3, characterized in that: The AC / DC converter in the voltage regulation module emits or absorbs active power , Size should meet the following requirements: Where, is the active power; AC-DC converter AC side voltage The difference from the set upper voltage threshold or lower voltage threshold; AC-DC converter The AC line resistance between the grid connection point and the head end of the substation.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the low-voltage distribution network flexible voltage regulation method according to any one of claims 1 to 2 is implemented.

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