Cross-regional voltage regulation method and system for medium and low voltage distribution network

Abstract

The invention discloses a cross-regional voltage regulation method and system for a medium and low voltage distribution network, and the method comprises the steps: firstly transmitting the output end electric quantity information of any two execution devices to a control device, then generating a voltage regulation request instruction by the control device according to the received output end electric quantity information of any two execution devices, and transmitting the voltage regulation request instruction to a corresponding execution device, and finally, after receiving the voltage regulation request instruction, the execution device transmits electric quantity among different power supply areas according to the voltage regulation request instruction, or regulates the voltage of the power supply area where the execution device is located by adopting a control strategy. According to the invention, the voltage of different power supply areas can be monitored in real time, and flexible power transmission among different power supply areas and dynamic voltage regulation in a single power supply area are realized, so that the voltage balance of each power supply area is realized, the power supply reliability of the medium and low voltage distribution network is improved, the electric energy quality is improved, and the resource configuration is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid voltage control, and in particular to a method and system for cross-regional voltage regulation in a medium- and low-voltage distribution network. Background Art

[0002] The power supply radius of rural power grid lines is large, there are many branch lines, the power load points are numerous and wide, and they are small and scattered, with significant seasonal load characteristics, too concentrated power consumption periods, low annual average load rate, and large peak-to-valley difference. Among them, during the valley load period, the distribution transformer is in a light-load operation state, and the power supply voltage to users is high. The high power supply voltage will accelerate the insulation aging of power supply and power equipment, increase losses, and even endanger the safety of the power grid and equipment; during the peak load period, the distribution transformer is in a heavy-load or overloaded operation state, and the power supply voltage to users is low (referred to as "low voltage" for short). The "low voltage" problem will cause the efficiency of power supply and power equipment to decrease, endangering the safe and economic operation of the power grid, causing some household appliances to be unable to be used normally, and seriously affecting the production and life of residents. In addition, with the in-depth promotion of smart grid construction, the proportion of clean energy utilization has increased year by year, and the problem of voltage fluctuation in the distribution network has become more prominent due to the access of distributed power sources and the batch construction of electric vehicle charging piles.

[0003] At present, flexible AC transmission technology, which integrates power electronics technology, microprocessing and microelectronics technology, communication technology and control technology, is developed rapidly for flexible and rapid control of AC transmission. Equipment such as static VAR compensator, static synchronous series compensator and unified power flow controller can realize voltage control and power flow control. However, most of its application scenarios are main grid construction such as high voltage and ultra-high voltage DC transmission. It is not very suitable for medium and low voltage distribution networks, and cannot guarantee the voltage stability of medium and low voltage distribution networks across regions, thereby failing to improve users' power quality and experience. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a cross-regional voltage regulation method and system for medium and low voltage distribution networks, which can ensure the voltage stability between different power supply areas in the medium and low voltage distribution networks, thereby improving the user's power quality and power consumption experience.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a method for cross-regional voltage regulation of a medium and low voltage distribution network, which is applied to a control device and includes:

[0006] Receiving output power information of any two execution devices; wherein each of the execution devices is arranged in equipment in different power supply areas;

[0007] A voltage regulation request instruction is issued based on the received output power information of the two execution devices; wherein the voltage regulation request instruction is used to instruct the execution device to transfer power between different power supply areas, or to use a control strategy to adjust the voltage of the power supply area where the execution device is located.

[0008] Specifically, the output terminal power information of the execution device includes the output terminal voltage, output terminal current and output terminal power of the execution device.

[0009] As an improvement of the above solution, the step of issuing a voltage regulation request instruction according to the received output terminal power information of the two execution devices includes:

[0010] When the received output terminal power difference ratio of the two execution devices is higher than a preset threshold, a first voltage regulation request instruction is issued to each of the execution devices; wherein the first voltage regulation request instruction is used for the execution device to transfer power between different power supply areas;

[0011] When the voltage in the power supply area where any of the execution devices is located is lower than or higher than the standard power supply voltage, a second voltage regulation request instruction is issued to the execution device set in the target power supply area where the voltage is lower than the standard power supply voltage; wherein the second voltage regulation request instruction is used to instruct the execution device to adopt a control strategy to adjust the voltage in the power supply area where the execution device is located.

[0012] In order to solve the above technical problems, an embodiment of the present invention further provides a method for cross-regional voltage regulation of a medium and low voltage distribution network, which is applied to an execution device and includes:

[0013] Detecting the output power information of the execution device, and sending the output power information to the control device;

[0014] receiving a voltage regulation request instruction issued by the control device;

[0015] According to the voltage regulation request instruction, power is transmitted between different power supply areas, or a control strategy is adopted to regulate the voltage of the power supply area where the execution device is located.

[0016] As an improvement of the above solution, the control strategy is a control strategy based on an active power filter and a static synchronous compensator.

[0017] Furthermore, the adopting of a control strategy to adjust the voltage of the power supply area where the execution device is located includes:

[0018] The control parameters of the active power filter and the static synchronous compensator are adjusted to regulate the voltage of the power supply area where the execution device is located.

[0019] To solve the above technical problems, an embodiment of the present invention further provides a control device and at least two execution devices, wherein the control device is in communication connection with each of the execution devices; each of the execution devices is arranged in a device in a different power supply area;

[0020] Each of the execution devices is used to detect the power information of its own output end and transmit the power information of the output end to the control device;

[0021] The control device is used to receive the output power information of each of the execution devices, and to issue a voltage regulation request instruction based on the output power information; wherein the voltage regulation request instruction is used to instruct the execution device to transfer power between different power supply areas, or to use a control strategy to adjust the voltage of the power supply area where the execution device is located.

[0022] As an improvement of the above solution, each of the execution devices includes an active power filter and a static synchronous compensator.

[0023] As an improvement of the above solution, the equipment in different power supply areas includes inverters, converters, electric voltage regulators and transformers.

[0024] Compared with the prior art, the embodiment of the present invention provides a method and system for cross-regional voltage regulation of a medium and low voltage distribution network. First, the output power information of any two execution devices is sent to the control device. The control device receives the output power information of the two execution devices, and generates a voltage regulation request instruction and sends it to the corresponding execution device. Finally, after the execution device receives the voltage regulation request instruction, it performs power transmission between different power supply areas according to the voltage regulation request instruction, or uses a control strategy to adjust the voltage of the power supply area where it is located. The present invention can monitor the voltage of different power supply areas in real time, and realize flexible power transmission between different power supply areas and dynamic voltage regulation within a single power supply area, so as to achieve voltage balance in each power supply area, thereby improving the power supply reliability of the medium and low voltage distribution network, improving the power quality, and optimizing resource allocation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution of the present invention, the drawings used in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a flow chart of a method for cross-regional voltage regulation of a medium and low voltage distribution network provided by an embodiment of the present invention;

[0027] Figure 2It is another flow chart of a method for cross-regional voltage regulation of a medium and low voltage distribution network provided by an embodiment of the present invention;

[0028] Figure 3 is another flow chart of a method for cross-regional voltage regulation of a medium and low voltage distribution network provided by an embodiment of the present invention;

[0029] Figure 4 It is a structural block diagram of a cross-regional voltage regulation system for a medium and low voltage distribution network provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0030] 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.

[0031] See also Figure 1 , Figure 1 1 is a flow chart of a method for cross-regional voltage regulation of a medium- and low-voltage distribution network provided by an embodiment of the present invention. The method for cross-regional voltage regulation of a medium- and low-voltage distribution network is applied to a control device and includes steps S101 to S102:

[0032] S101, receiving output power information of any two execution devices; wherein each of the execution devices is arranged in equipment in different power supply areas;

[0033] S102. Issue a voltage regulation request instruction based on the received output power information of the two execution devices; wherein the voltage regulation request instruction is used to instruct the execution device to transfer power between different power supply areas, or to use a control strategy to adjust the voltage of the power supply area where the execution device is located.

[0034] Specifically, the output terminal power information of the execution device includes the output terminal voltage, output terminal current and output terminal power of the execution device.

[0035] In an optional embodiment, issuing a voltage regulation request instruction according to the received output terminal power information of the two execution devices includes:

[0036] When the received output terminal power difference ratio of the two execution devices is higher than a preset threshold, a first voltage regulation request instruction is issued to each of the execution devices; wherein the first voltage regulation request instruction is used for the execution device to transfer power between different power supply areas;

[0037] When the voltage in the power supply area where any of the execution devices is located is lower than or higher than the standard power supply voltage, a second voltage regulation request instruction is issued to the execution device set in the target power supply area where the voltage is lower than the standard power supply voltage; wherein the second voltage regulation request instruction is used to instruct the execution device to adopt a control strategy to adjust the voltage in the power supply area where the execution device is located.

[0038] It should be noted that the purpose of the first voltage regulation request instruction is to encourage different power supply areas to transfer electricity to each other, so as to achieve power balance between different power supply areas. In practical applications, low-voltage flexible interconnection technology can be used to achieve power transfer between different power supply areas.

[0039] Low-voltage flexible interconnection technology is a smart grid technology based on power electronics technology and communication technology. By introducing advanced power electronics devices and digital signal processing technology, it can realize fast, accurate and stable interconnection of distribution lines in low-voltage power supply areas. The key to this technology is that it can flexibly control the direction and size of the power grid flow, thereby realizing flexible interconnection and mutual assistance between different power supply areas. In addition, low-voltage flexible interconnection technology can also optimize power distribution, reduce line losses, and improve the energy efficiency of the power system. Its intelligent monitoring function allows real-time monitoring and data collection of distribution lines, providing support for the intelligent management of power systems. Preferably, in an embodiment of the present invention, its low-voltage flexible interconnection technology can be used to control the direction and size of the power grid flow, that is, to control the distribution and flow of electric power, to achieve voltage boost or voltage reduction.

[0040] It should be noted that the power difference between the output ends of the two actuators can be a voltage difference, a current difference or a power difference. For example, the corresponding power can be increased by monitoring the voltage difference. If the load end needs to be boosted, current is output to the load end.

[0041] In an optional embodiment, the difference ratio of the output terminal electric quantity of the two execution devices is specifically the difference ratio of the output terminal voltage of the two execution devices, which is calculated by the following formula:

[0042] K=i / [(U 2 -U 1 )-ΔU ref ],i≤I max ;

[0043] Among them, K represents the proportionality coefficient. The larger the K value, the greater the voltage fluctuation between different power supply areas; U 1 Represents the output voltage of actuator 1; U 2 Represents the output voltage of the actuator 2; ΔU ref Represents a preset voltage difference (or a preset voltage threshold of a power supply area); I max Represents the current limit.

[0044] It should be noted that when the execution device sends the power information, in addition to sending the output power information, it will also send the input power information (such as input voltage, current and power) for further judgment.

[0045] It should be noted that the voltage of the power supply area usually refers to the voltage difference between the input and output ends of the area, so the voltage difference between the input and output ends of the actuator 1 represents the voltage of the power supply area 1. Among them, the standard power supply voltage is specifically the voltage specified by the national standard (such as 220V+7%, -10% for a single-phase system of a medium and low voltage distribution network, and 380V±7% for a three-phase system of a medium and low voltage distribution network).

[0046] It is worth noting that the voltage difference thresholds of different actuators (i.e., voltage thresholds of different power supply areas) can be designed based on factors such as different time periods throughout the day, different seasons throughout the year, and different energy equipment connected to the distribution network.

[0047] For example, if only the photovoltaic access scenario is considered, considering the different light intensities at different times of the day, when there are more photovoltaic accesses in a certain area, the voltage threshold of the execution device is divided according to the daytime and nighttime periods. It can be set to 230V during the day and 221V at night to ensure the user's electricity experience. If both wind power generation and photovoltaic access scenarios are considered at the same time, considering that due to wind power generation site selection rules and other reasons, wind power generation equipment may supply energy to the grid through transmission lines throughout the day, so the voltage threshold can be set to 230V regardless of the time period. For ordinary users in some areas, and without photovoltaic access or with a small amount of access, the voltage threshold can be set to 224V.

[0048] Exemplarily, the execution device 1 and the execution device 2 are respectively arranged in the equipment of the target power supply area 1 and the target power supply area 2. The control device determines the difference between the output terminal voltages of the execution device 1 and the execution device 2 through the output terminal voltages of the execution device 1 and the execution device 2. If the difference exceeds the preset voltage difference, it means that the power supply capacity of the execution device 1 is insufficient compared with the target area where the execution device 2 is located. Then, the surplus power in the power supply area where the execution device 2 is located can be further transmitted to the power supply area where the execution device 1 is located to balance the voltage between different power supply areas. In addition, it is also possible to further determine whether the voltage of the power supply area where the execution device is located (which can be obtained by calculating the difference between the input terminal voltage and the output terminal voltage of the execution device) is lower than the standard power supply voltage, and then send a voltage adjustment request instruction to the execution device (such as the execution device 1) arranged in the power supply area with a voltage lower than the standard voltage. After receiving the voltage adjustment request instruction, the execution device 1 uses a corresponding control strategy according to the instruction to adjust the voltage and other power information in the current target power supply area.

[0049] It is worth noting that the voltage regulation request instruction of the control device is not only based on the comprehensive analysis of the power information of the actuators in different areas, but also on the judgment of the voltage status of the power supply area where the actuator itself is located. Specifically, when the difference between the power of the actuators in different power supply areas is higher than the preset threshold, the control device will identify this phenomenon as a potential risk of voltage instability. If the difference is too large, it indicates voltage fluctuations in different power supply areas. In this case, a voltage regulation request is issued from one power supply area to another power supply area to transfer power, and it is ensured that the power supply area with a voltage lower than the standard power supply voltage can also use the actuator to adjust the voltage of its own power supply area and restore the balance, so that the flexible interconnection of different power supply areas and the voltage regulation and stabilization of a single power supply area can work together, which can flexibly respond to the ever-changing power supply demand and external environment, ensure that the voltage of the distribution network across regions is stable within a reasonable range, and effectively improve the overall operation efficiency of the power system.

[0050] See also Figure 2 , Figure 2 It is another flow chart of a method for cross-regional voltage regulation of a medium and low voltage distribution network provided by an embodiment of the present invention, which is applied to an execution device and includes steps S201 to S203:

[0051] S201, detecting the output power information of the execution device, and sending the output power information to the control device;

[0052] S202, receiving a voltage regulation request instruction issued by the control device;

[0053] S203: According to the voltage regulation request instruction, power is transmitted between different power supply areas, or a control strategy is used to regulate the voltage of the power supply area where the execution device is located.

[0054] Exemplarily, the execution device detects the power information of the execution device's own output end in real time. Specifically, the execution device continuously detects data information such as current, voltage, and power at its own output end, and sends it to the control device. After receiving the output end power information, the control device will analyze the current power status according to a preset logic, and generate a corresponding voltage regulation request instruction. Based on the received voltage regulation request instruction, the execution device will transmit power according to the voltage regulation request instruction, or adjust the voltage of the power supply area where the execution device itself is located, so that the voltage in each power supply area tends to be stable.

[0055] In an optional embodiment, the control strategy is a control strategy based on an active power filter and a static synchronous compensator.

[0056] Furthermore, the adopting of a control strategy to adjust the voltage of the power supply area includes:

[0057] Adjust the control parameters of the active power filter and the static synchronous compensator to regulate the voltage in the power supply area where the actuator is located.

[0058] It should be noted that the active power filter (APF) is a new type of power electronic device used to dynamically suppress harmonics and compensate for reactive power. It can compensate for harmonics with varying sizes and frequencies and varying reactive power. The static synchronous compensator (STATCOM) is one of the core devices and core technologies of the flexible AC transmission system. The static synchronous compensator uses a new generation of power electronic devices, such as gate turn-off thyristors (GTOs), insulated gate bipolar transistors (IGBTs), and integrated gate-commutated thyristors (IGCTs), and uses modern control technology. Its role in the power grid system is to compensate for reactive power, improve the voltage stability of the grid system, and improve system performance.

[0059] It is worth noting that using APF to compensate harmonics and STATCOM to adjust reactive power can simultaneously improve power quality, enhance the voltage stability of the power grid, and ensure stable power supply to the load end. The basic principle of its control strategy is to use the parallel side circuit to obtain active power for voltage compensation from the line, and to achieve load side voltage compensation by using direct voltage control or resonant control on the series side, thereby achieving the improvement of the amplitude of the medium and low voltage distribution network and the elimination of grid voltage harmonics.

[0060] For example, in the medium and low voltage distribution network system, a static synchronous compensator is connected in parallel to obtain active power from the main power line to compensate the load; an active power filter is installed in front of the load to compensate the grid voltage in series. In specific implementation, the voltage can be monitored and adjusted in real time to keep the voltage within the set range.

[0061] For example, taking a medium and low voltage distribution network system as a four-arm three-phase four-wire system (TP-FW) as an example, the control strategy based on active power filter and static synchronous compensator (APF-STATCOM) is described:

[0062] The four-arm three-phase four-wire system uses four wires to provide the corresponding three-phase AC power supply. The APF continuously monitors the current waveform in the system and uses the harmonic current detection method to detect the harmonic components. Then, based on the signal processing results, a reference current signal is generated through a control algorithm (such as PI control, i.e. proportional-integral control), which compensates for the harmonic current in real time and injects a current opposite to the harmonic current to achieve current waveform correction, so that the system current is as close to a pure sinusoidal waveform as possible.

[0063] It is worth noting that the traditional harmonic current detection method relies on the instantaneous reactive power theory, ignores the zero-sequence component during three-phase distortion, and is very susceptible to voltage distortion and asymmetry. This can lead to significant inaccuracies in the detection results, making the output difficult to trust. In an embodiment of the present invention, the sine and cosine signal generation phase-locked loop (PLL) is integrated into the harmonic detection algorithm based on the instantaneous reactive power theory, that is, the harmonic current detection method, so that accurate detection using PLL can be ensured.

[0064] At the same time, STATCOM is used to monitor the power supply voltage of the distribution network. According to the voltage changes, STATCOM adopts voltage source control technology to achieve independent reactive power output. According to the voltage source control strategy, the output of STATCOM is adjusted by setting the correct reference voltage to stabilize the system voltage.

[0065] See also Figure 3 , Figure 3 is another flow chart of a method for cross-regional voltage regulation of a medium and low voltage distribution network provided by an embodiment of the present invention, such as Figure 3 As shown, first, the output power information of any two executing devices is sent to the control device, and then the output power information of the two executing devices is received by the control device, and a voltage regulation request instruction is generated and sent to the corresponding executing device. Finally, after the executing device receives the voltage regulation request instruction, it transfers power between different power supply areas according to the voltage regulation request instruction, or adopts a control strategy to adjust the voltage of the power supply area where the executing device is located.

[0066] It is worth noting that a cross-regional voltage regulation method for medium and low voltage distribution networks provided in an embodiment of the present invention can collect and monitor the power information of different power supply areas, and identify the gap between the current power supply and demand, thereby generating a voltage regulation request instruction, thereby realizing flexible power transmission between different power supply areas, so as to achieve voltage balance in each power supply area, thereby improving the power supply reliability of the medium and low voltage distribution networks, improving the power quality, and optimizing resource allocation.

[0067] See also Figure 4 , Figure 4 1 is a structural block diagram of a cross-regional voltage regulation system for a medium and low voltage distribution network provided by an embodiment of the present invention. Figure 4 As shown, the medium and low voltage distribution network cross-regional voltage regulation system 3 includes a control device 301 and at least two execution devices (3021, 3022, ..., 302n), the control device 301 is communicatively connected with each of the execution devices; each of the execution devices is arranged in equipment in different power supply areas;

[0068] Each of the execution devices is used to detect the power information of its own output end, and transmit the power information of the output end to the control device 301;

[0069] The control device 301 is used to receive the output power information of each of the execution devices, and issue a voltage regulation request instruction based on the output power information; wherein the voltage regulation request instruction is used to instruct the execution device to transfer power between different power supply areas, or to use a control strategy to adjust the voltage of the power supply area where the execution device is located.

[0070] In an optional embodiment, the equipment in different power supply areas includes an inverter, a converter, an electric voltage regulator and a transformer.

[0071] As an improvement of the above solution, each of the execution devices includes an active power filter and a static synchronous compensator.

[0072] Exemplarily, different power supply areas, user needs and power quality standards of medium and low voltage distribution and voltage regulation systems are determined, a communication interface is configured between the control device and each execution device, and the execution devices are arranged at the front end of the load in different target power supply areas, such as inverters, converters and transformer equipment. Then, each execution device performs real-time detection of the output power information and transmits it to the control device. The control device monitors and analyzes the power data and voltage conditions of various power supply areas to generate a voltage regulation request instruction. After receiving the voltage regulation request instruction, the execution device determines whether it is necessary to transmit power to other power supply areas, or adjust the voltage of the power supply area where it is located, so that the voltage of each power supply area tends to a stable value and maintains stability, thereby improving the voltage stability and power quality of different power supply areas.

[0073] It should be noted that the working principles and beneficial effects of the cross-regional voltage regulation system for medium and low voltage distribution networks provided in an embodiment of the present invention correspond one to one with the cross-regional voltage regulation method for medium and low voltage distribution networks in the above-mentioned embodiment, and therefore will not be described in detail.

[0074] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for cross-regional voltage regulation of medium and low voltage distribution networks, characterized in that: Applicable to control devices, including: Receiving output power information of any two execution devices; wherein each of the execution devices is arranged in equipment in different power supply areas; A voltage regulation request instruction is issued based on the received output power information of the two execution devices; wherein the voltage regulation request instruction is used to instruct the execution device to transfer power between different power supply areas, or to use a control strategy to adjust the voltage of the power supply area where the execution device is located.

2. The method for cross-regional voltage regulation of medium and low voltage distribution networks according to claim 1, characterized in that: The output terminal electrical quantity information of the execution device includes the output terminal voltage, output terminal current and output terminal power of the execution device.

3. The method for cross-regional voltage regulation of medium and low voltage distribution networks according to claim 1, characterized in that: The step of issuing a voltage regulation request instruction according to the received output terminal power information of the two execution devices includes: When the received output power difference ratio of the two execution devices is higher than a preset threshold, a first voltage regulation request instruction is issued to each of the execution devices; wherein the first voltage regulation request instruction is used for the execution device to transfer power between different power supply areas; When the voltage in the power supply area where any of the execution devices is located is lower than or higher than the standard power supply voltage, a second voltage regulation request instruction is issued to the execution device set in the target power supply area where the voltage is lower than the standard power supply voltage; wherein the second voltage regulation request instruction is used to instruct the execution device to adopt a control strategy to adjust the voltage in the power supply area where the execution device is located.

4. A method for cross-regional voltage regulation of medium and low voltage distribution networks, characterized in that: Applicable to actuators, including: Detecting the output power information of the execution device, and sending the output power information to the control device; receiving a voltage regulation request instruction issued by the control device; According to the voltage regulation request instruction, power is transmitted between different power supply areas, or a control strategy is adopted to regulate the voltage of the power supply area where the execution device is located.

5. The method for cross-regional voltage regulation of medium and low voltage distribution networks according to claim 4, characterized in that: The control strategy is a control strategy based on an active power filter and a static synchronous compensator.

6. The method for cross-regional voltage regulation of medium and low voltage distribution networks according to claim 5, characterized in that: The adopting of a control strategy to adjust the voltage of the power supply area where the execution device is located includes: The control parameters of the active power filter and the static synchronous compensator are adjusted to regulate the voltage of the power supply area where the execution device is located.

7. A cross-regional voltage regulation system for medium and low voltage distribution networks, characterized in that: It includes a control device and at least two execution devices, wherein the control device is in communication connection with each of the execution devices; each of the execution devices is arranged in equipment in different power supply areas; Each of the execution devices is used to detect the power information of its own output end and transmit the power information of the output end to the control device; The control device is used to receive the output power information of each of the execution devices, and to issue a voltage regulation request instruction based on the output power information; wherein the voltage regulation request instruction is used to instruct the execution device to transfer power between different power supply areas, or to use a control strategy to adjust the voltage of the power supply area where the execution device is located.

8. The cross-regional voltage regulation system for medium and low voltage distribution networks according to claim 7, characterized in that: Each of the execution devices includes an active power filter and a static synchronous compensator.

9. The cross-regional voltage regulation system for medium and low voltage distribution networks according to claim 7, characterized in that: The equipment in different power supply areas includes inverters, converters, electric voltage regulators and transformers.

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