Power distribution website-line-transformer-household layered voltage regulation method and system

Abstract

The invention discloses a power distribution network station-line-transformer-household layered voltage regulation method and system, and the method aims at the voltage out-of-limit problem of a power distribution network, carries out the linkage treatment according to the sequence of station-line-transformer-household from top to bottom, solves the voltage out-of-limit problem of a piece through a transformer substation and a line, and solves the voltage out-of-limit problem of a distribution room and a user. According to the method, an in-station AVC control strategy is optimized at a substation level, voltage regulation is carried out through a medium-voltage line voltage regulator and a reactive power compensation device at a line level, the problem of voltage out-of-limit reasons of individual users is solved through gear shifting and reactive power compensation device switching according to the conditions of distribution transformer low-voltage side outlet voltage and user voltage at a distribution transformer level, and the voltage out-of-limit reasons of the individual users are subjected to on-site model arrangement. And measures of adding a household reactive power compensation device, transforming a user line and the like are adopted in a targeted manner. According to the invention, through multi-level voltage linkage, the problem that the high voltage problem of the current user is prominent but the single-level voltage regulation capability is insufficient is solved, and the safety, reliability and economical efficiency of power grid operation are improved.

Description

Technical Field

[0001] The patent of this invention relates to the field of voltage regulation strategy for distribution networks in power systems. In response to the problem of voltage exceeding the limit in distribution networks, coordinated management is carried out in a top-down order of "station-line-transformer-user". The problem of voltage exceeding the limit in large areas is solved through substations and lines, and the problem of voltage exceeding the limit in dispersed areas and users is solved. Background Art

[0002] The regional distribution network in my country is relatively scattered, and long-distance power supply is a common phenomenon. For example, the length of a 10kV line is more than 15km, and the length of a 400V line is more than 500m. The transmission distance is long, the resistance is large, and the voltage difference between the beginning and the end of the line is large. Faced with a relatively scattered voltage distribution, voltage management is difficult to solve through a single-level voltage regulation method.

[0003] With the massive access of distributed power sources and random loads such as electric vehicles, the operating environment of the distribution network is becoming increasingly complex, and the power amplitude fluctuation and direction change are highly random, which puts higher requirements on voltage stability and rapid regulation. During the operation of the passive distribution network, the voltage drops in the direction of power flow, and the end is the lowest voltage point. However, when distributed photovoltaics are incorporated into the distribution network, the flow will be reversed, and the user voltage distribution will be highly uncertain and volatile. The traditional single voltage regulation strategy is difficult to meet the development needs of the current new power system.

[0004] Prior art document 1 (CN115603368 A) discloses a station-line-transformer multi-level reactive coordination optimization method considering photovoltaic access. The document takes photovoltaic consumption level, power supply reliability, and power grid economic operation level as comprehensive goals, and the output results are the action quantities of resources such as reactive power and taps. However, these resources are available at multiple levels such as substations, lines, and distribution transformers, and the action quantity and action sequence of each level are not specified; at the equipment level, the main control equipment is reactive compensation devices, photovoltaics, energy storage, etc., and line voltage regulators, user-level voltage regulation resources, etc. are not considered. All voltage regulation resources are not fully considered, and optimal voltage regulation cannot be achieved; at the algorithm level, the adjustment strategy is generated by iterative optimization, and the voltage is a systematic and complex mathematical problem, or it faces an unsolvable situation, and the applicable scenarios are limited.

[0005] Prior art document 2 (CN115459283A) discloses an AVC active adaptive collaborative control method for preventing main grid voltage from exceeding the limit. This document only optimizes the AVC control logic within the substation without considering the voltage regulation resources at the line, distribution transformer, and user level. Summary of the invention

[0006] The present invention proposes a top-down voltage over-limit management strategy of "station-line-transformer-user", which solves the problem of voltage over-limit in large areas through substations and lines, and solves the problem of voltage over-limit in distributed areas and users.

[0007] In order to achieve the above-mentioned object, the first aspect of the present invention discloses a distribution network-line-transformer-user hierarchical voltage regulation method; the steps are as follows:

[0008] At the substation level, time-segment AVC control is performed on the substation 10kV busbar;

[0009] At the line level, for lines with a power supply radius longer than the set distance or with daily voltage fluctuations greater than the set range, the voltage is adjusted through medium-voltage line regulators and line reactive power compensation devices;

[0010] At the distribution transformer level, when there are problems of voltage exceeding the upper limit or voltage exceeding the lower limit, if it is a non-excitation distribution transformer, the appropriate gear is calculated based on the voltage qualification rate of the user voltage, and the gear with the maximum user voltage qualification rate is selected as the target gear; if it is an on-load voltage regulation distribution transformer, the VQC strategy should be adopted to improve the user voltage qualification rate in each period through dynamic real-time adjustment;

[0011] At the substation level, when the voltage exceeds the upper limit due to the substation's photovoltaic installed capacity reaching the maximum capacity of the substation, and exceeds the voltage regulation range of the substation level, line level and distribution transformer level, it is solved through energy storage charging and V2G mode. If the problem of exceeding the upper limit still exists, the voltage qualification rate is improved through photovoltaic output control; the problem of the voltage exceeding the lower limit at the distribution transformer outlet is solved through energy storage discharge, V2G and the installation of reactive power compensation devices. After the substation level, line level and distribution transformer level are adjusted, if the problem of bidirectional voltage exceeding the limit of the substation users still exists, the line voltage regulating equipment can be installed to solve it;

[0012] For individual users who still have voltage over-limit problems after taking the above measures, on-site surveys should be conducted, and targeted measures such as adding household reactive power compensation devices and modifying household lines should be adopted based on actual conditions.

[0013] Preferably, performing AVC control in time periods is specifically as follows:

[0014] The daily voltage curve of the 10kV busbar of the substation presents a W-shaped feature. The AVC fine-grained control strategy is implemented in different time periods to lower the voltage threshold from 12:00 to 14:00 in the noon period and increase the voltage threshold from 18:00 to 22:00 in the evening period. The threshold range should be between 10kV and 10.7kV.

[0015] Preferably, the installation point of the 10 kV line voltage regulator is at the upper limit of the line voltage or the lower limit of the line voltage.

[0016] Preferably, when the voltage at the voltage regulator installation point fluctuates between 8kV and 10kV, a unidirectional voltage regulator with a voltage regulation range of 0-20% is selected; when the voltage at the voltage regulator installation point fluctuates between 8.5kV and 10.5kV, a unidirectional voltage regulator with a voltage regulation range of -5% to +15% is selected; when the voltage at the voltage regulator installation point fluctuates between 9kV and 11kV, a unidirectional voltage regulator with a voltage regulation range of -10% to +10% is selected; and if there are lines where new energy is connected, a bidirectional voltage regulator with a voltage regulation range of -20% to +20% is selected.

[0017] Preferably, the set distance is 15 km and the set range is between -7% and +7%.

[0018] Preferably, the VQC strategy is specifically:

[0019] When the power factor is less than 0.9, if the voltage is lower than 0.9U N , the reactive power compensation device is put into use in groups until the power factor reaches the upper limit. If the voltage still does not meet the requirements, the on-load voltage regulator is adjusted to increase the voltage. If the voltage is higher than 1.07U N , adjust the on-load tap changer to reduce the voltage. After the voltage is qualified, the reactive power compensation device is removed in groups until the power factor is between 0.9 and 1, where U N is the qualified voltage.

[0020] Preferably, when the power factor is between 0.9 and 1, if the voltage is lower than 0.9U N , adjust the tap changer of the on-load voltage regulating distribution transformer to boost the voltage. If the tap changer is at the highest gear, capacitors should be put into use in groups. If the voltage is higher than 1.07U N , adjust the on-load voltage regulating distribution tap changer to reduce the voltage. If the tap changer is in the lowest position, remove the capacitors in groups.

[0021] Preferably, for the problem of bidirectional voltage over-limit of users in the substation, if the bidirectional over-limit occurs at the same time, a substation line voltage regulator is installed to solve the problem; if the bidirectional over-limit occurs at different times, an on-load voltage regulating distribution transformer is installed to solve the problem.

[0022] Preferably, on-site investigation and problem solving are as follows:

[0023] In the case where the photovoltaic grid-connected capacity is less than the maximum capacity of the substation, check whether there is a problem of private photovoltaic connection. If there is a problem of private photovoltaic connection, correct the photovoltaic system ledger; check whether there are abnormalities in the monitoring data. If there are abnormal monitoring data, calibrate the monitoring equipment and add data verification steps to the equipment.

[0024] The second aspect of the present invention discloses a power distribution network site-line-transformer-user hierarchical voltage regulation system, based on the above-mentioned power distribution network site-line-transformer-user hierarchical voltage regulation method, comprising:

[0025] Substation voltage regulation module, used to perform time-segment AVC control on the 10kV busbar of the substation;

[0026] The line voltage regulation module is used to regulate the voltage at the line level through the medium voltage line voltage regulator and the line reactive power compensation device;

[0027] The distribution transformer voltage regulation module is used for off-excitation distribution transformer gear adjustment or on-load voltage regulation distribution transformer VQC control to solve the problem of distribution transformer level voltage exceeding the upper limit and voltage exceeding the lower limit;

[0028] The transformer area voltage regulation module is used to solve the problem of transformer area voltage exceeding the upper limit, voltage exceeding the lower limit, and voltage exceeding the limit in both directions;

[0029] The low-voltage user transformation module is used to carry out targeted transformation of individual low-voltage users.

[0030] The present invention has the following advantages:

[0031] 1. The voltage regulation strategy proposed in the present invention fully considers that the voltage quality problem is a systematic and comprehensive problem, and solves the current problem of insufficient voltage regulation resources at a single level through coordinated governance at all levels.

[0032] 2. Fully consider the current situation of large-scale grid-connected distributed photovoltaics under the new power system construction model to meet the current needs of bidirectional voltage management where high and low voltages coexist.

[0033] 3. By optimizing the control logic at all levels and fully tapping the value of voltage regulation resources at all levels, the grid regulation capability is increased, and the safety, reliability and economy of grid operation are improved.

[0034] 4. Clarify the voltage regulation logic of various voltage regulation resources at all levels, point out the direction for grassroots work, achieve optimal control, and realize efficient governance. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the distribution of station-line transformer-user voltage regulation resources;

[0036] Figure 2 It is a flow chart of the hierarchical voltage regulation strategy of "station-line-transformer-user" in the distribution network;

[0037] Figure 3 This is the voltage regulation principle of the distribution network. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only part of the embodiments of the present invention, not all of them. Based on the spirit of the present invention, other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0039] The first embodiment of the present invention provides a distribution network-line-transformer-user hierarchical voltage regulation method, which is further described in detail below in conjunction with the accompanying drawings.

[0040] In order to achieve reactive power balance everywhere and at all times and voltage compliance and stability in the regional power grid, the present invention divides the distribution network into five domains: station domain, line domain, distribution transformer domain, station area, and user. The distribution of station, line, transformer and user voltage regulation resources is shown in the attached manual. Figure 1 As shown, the principle of the voltage regulation strategy of the present invention is as shown in the appendix of the specification. Figure 3 shown.

[0041] As the instruction manual Figure 2 As shown in the figure, the voltage regulation strategy of the distribution network "station-line-transformer-user" is:

[0042] Step 1: Optimize the AVC control strategy of the substation to solve the large-scale voltage over-limit and reactive power flow problems. Affected by the photovoltaic reverse transmission, the voltage rises layer by layer, resulting in the concentrated high voltage of users between 12 and 14 o'clock in the afternoon. The daily voltage curve of the 10kV busbar of the substation presents a W-shaped feature. The busbar has a large downward adjustment space during the noon period. Therefore, the AVC refined control strategy is implemented in different time periods to reduce the voltage threshold during the noon period. Among them, the time period refers to lowering the voltage threshold between 12 and 14 o'clock in the noon period and increasing the voltage threshold between 18 and 22 o'clock in the evening period, so as to achieve the effect of "reducing voltage during peak hours and increasing voltage during valley hours". The threshold should be determined according to the actual needs on site, and the range should be between 10kV-10.7kV.

[0043] Refinement means that the AVC control strategy achieves refined regulation of the voltage in the station through the refinement of multiple grouping capacitor banks in the station. For example, the original 8000kvar capacitor bank in the station is refined to 1000kvar*8, and the purpose of fine voltage control is achieved through multi-group switching. The threshold range should be between 10.1-10.6kV;

[0044] Step 2: At the line level, for lines with long power supply radius or large daily voltage fluctuations, the voltage is adjusted by installing medium voltage line voltage regulators and line reactive power compensation devices. Generally, if the power supply radius is longer than 15km, the power supply radius is considered to be long. If there are lines where the node voltage is lower than the qualified voltage by -7% and higher than the qualified voltage by +7%, the daily voltage fluctuation is considered to be large.

[0045] Regarding the installation point location: The installation point of the 10kV line voltage regulator should be at the upper or lower limit of the line voltage: Generally, the installation point of the unidirectional voltage regulator is 1 / 2 or 2 / 3 away from the load, and the installation point of the bidirectional voltage regulator is 1 / 3 or 1 / 2 of the load.

[0046] Regarding installation capacity: the capacity of a one-way voltage regulator is determined based on the power load behind the device installation point; the capacity of a two-way voltage regulator is determined based on the power load and power supply capacity before and after the device installation point; the capacity of the voltage regulator is selected from 1000kVA, 2000kVA, and 4000kVA.

[0047] Regarding the selection of voltage regulation range: In radial distribution networks, when the voltage at the voltage regulator installation point fluctuates between 8kV and 10kV, a unidirectional voltage regulator with a voltage regulation range of 0-20% is selected; when the voltage at the voltage regulator installation point fluctuates between 8.5kV and 10.5kV, a unidirectional voltage regulator with a voltage regulation range of -5% to +15% is selected; when the voltage at the voltage regulator installation point fluctuates between 9kV and 11kV, a unidirectional voltage regulator with a voltage regulation range of -10% to +10% is selected. For lines with high-power hydropower and distributed photovoltaic, wind power and other new energy access, a bidirectional voltage regulator with a voltage regulation range of -20% to +20% is generally selected.

[0048] Step 3: At the distribution transformer level, if it is a non-excitation distribution transformer, the voltage qualification rate of the user voltage in the last 1-3 months is used to calculate the appropriate gear, and the gear with the maximum user voltage qualification rate is selected as the target gear; if it is a load-controlled distribution transformer, the VQC strategy (voltage-reactive power joint control strategy) should be adopted to realize reactive power compensation switching and load-controlled voltage regulation, and improve the user voltage qualification rate in each period through dynamic real-time adjustment; the switching mechanism of the reactive power compensation device in the substation should not be limited to the power factor, but the voltage should be included in the control logic. The joint control logic of the load-controlled distribution transformer and the reactive power compensation device should be as shown in the following table (U in the table is N The qualified voltage and the qualified power factor range are between 0.9 and 1):

[0049]

[0050]

[0051] Step 4: At the substation level, if the voltage exceeds the upper limit due to the high installed capacity of photovoltaic power in the substation, which exceeds the voltage regulation range of steps 1-3, the high voltage problem in the substation should be solved by energy storage charging and V2G mode first, and then photovoltaic output control, including but not limited to photovoltaic output rigid control and photovoltaic output flexible control, should be used to improve the voltage qualification rate. Among them, photovoltaic output belongs to the user's assets and should be controlled last. For the problem of voltage exceeding the lower limit at the distribution transformer outlet, it can be solved by voltage regulation resources such as energy storage discharge, V2G, and reactive power compensation devices. After the adjustment of steps 1-3, if the problem of bidirectional voltage exceeding the limit still exists for the users in the substation, it can be replaced with an on-load voltage regulation distribution transformer or a line voltage regulator can be installed in the substation.

[0052] Specifically, the voltage regulation at the substation level is that the voltage at the outlet of the substation exceeds the adjustment range. For the problem of voltage exceeding the upper limit due to the large amount of photovoltaic grid-connected, the high voltage problem in the substation is solved by energy storage charging and V2G mode first; secondly, photovoltaic output control methods such as photovoltaic output flexibility and rigid control are selected, or deep voltage regulation distribution transformers are installed; for the problem of low voltage at the outlet of the distribution transformer due to reasons such as medium-voltage line power supply radius longer than 15km and high power, the voltage can be managed by combining line reactive power compensation devices with deep voltage regulation distribution transformers. The second is the scenario of bidirectional voltage over-limit of substation users. For the problem that the voltage difference between the first and the last two ends is greater than 17% due to the long power supply radius of the substation and the high power, if it is a bidirectional over-limit at the same time, a substation line voltage regulator should be installed. If it is a bidirectional over-limit at different times, it should be solved by installing a load-controlled voltage regulation distribution transformer.

[0053] Step 5: For individual users who still have voltage over-limit problems after taking steps 1-4, an on-site survey should be conducted, and targeted modifications should be carried out based on actual conditions, using measures such as adding household reactive power compensation devices and modifying household lines.

[0054] The specific process of on-site investigation and problem solving is as follows: for the case where the photovoltaic grid-connected capacity is less than the maximum capacity of the substation, check whether there is a problem of private photovoltaic connection. If there is a problem of private photovoltaic connection, correct the photovoltaic system ledger; check whether there are abnormalities in the monitoring data. If there are abnormal monitoring data, calibrate the monitoring equipment and add data verification steps to the equipment; if the voltage is over-limit, the targeted transformation measures are: adding household reactive power compensation devices, down-line transformation and other measures.

[0055] As a prominent substantive feature of the present invention and one of the significant advances it brings to the prior art, the present invention takes voltage regulation as its goal, aims to achieve the most efficient voltage regulation through the aggregation of various voltage regulation resources, and clarifies the action logic of various types of voltage regulation resources at various levels of station-line transformers in a top-down logical order.

[0056] A second embodiment of the present invention provides a distribution network-line-transformer-user hierarchical voltage regulation system, including the following modules:

[0057] Substation voltage regulation module, used to reduce the voltage threshold of the substation between 12:00 and 14:00, and to increase the voltage threshold of the substation between 18:00 and 22:00;

[0058] The line voltage regulation module is used to regulate the voltage at the line level through the medium voltage line voltage regulator and the line reactive power compensation device;

[0059] The distribution transformer voltage regulation module is used to solve the problem of the voltage exceeding the upper limit and the voltage exceeding the lower limit at the distribution transformer level through the off-excitation distribution transformer gear adjustment or the on-load voltage regulation distribution transformer VQC control;

[0060] The transformer area voltage regulation module is used to solve the problem of transformer area voltage exceeding the upper limit, voltage exceeding the lower limit, and voltage exceeding the limit in both directions;

[0061] The low-voltage user transformation module is used to carry out targeted transformation of individual low-voltage users.

[0062] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A distribution network-line-transformer-user hierarchical voltage regulation method, characterized in that: The following steps are involved: At the substation level, time-segment AVC control is performed on the substation 10kV busbar; At the line level, for lines with a power supply radius longer than the set distance or with daily voltage fluctuations greater than the set range, voltage regulation is performed by installing voltage regulators and line reactive power compensation devices on medium-voltage lines; At the distribution transformer level, when there is a voltage over-limit problem, if it is a non-excitation distribution transformer, the appropriate gear is calculated based on the voltage qualification rate of the user voltage, and the gear with the maximum user voltage qualification rate is selected as the target gear; if it is an on-load voltage regulation distribution transformer, the VQC strategy is adopted to improve the user voltage qualification rate in each period through dynamic real-time adjustment; At the substation level, when the voltage exceeds the upper limit due to the substation's photovoltaic installed capacity reaching the maximum capacity of the substation, and exceeds the voltage regulation range of the substation level, line level and distribution transformer level, it is solved through energy storage charging and V2G mode. If the problem of exceeding the upper limit still exists, photovoltaic output control is adopted; the problem of the voltage exceeding the lower limit at the distribution transformer outlet is solved through energy storage discharge, V2G and the installation of reactive power compensation devices; After being regulated at the substation level, line level and distribution transformer level, if there is a problem of bidirectional voltage over-limit for users in the substation area, it can be solved by installing line voltage regulating equipment; For individual users who still have voltage over-limit problems after taking the above measures, targeted measures such as adding household reactive power compensation devices and modifying household lines should be adopted based on actual conditions.

2. A distribution network-line-transformer-user hierarchical voltage regulation method as claimed in claim 1, characterized in that: The specific implementation of AVC control in time periods is as follows: The daily voltage curve of the 10kV busbar of the substation presents a W-shaped feature. The AVC fine-grained control strategy is implemented in different time periods to lower the voltage threshold from 12:00 to 14:00 in the noon period and increase the voltage threshold from 18:00 to 22:00 in the evening period. The threshold range should be between 10kV and 10.7kV.

3. A distribution network-line-transformer-user hierarchical voltage regulation method as claimed in claim 1, characterized in that: The installation point of the 10kV line voltage regulator is where the line voltage is at the upper limit or the lower limit.

4. A distribution network-line-transformer-user hierarchical voltage regulation method as claimed in claim 3, characterized in that: When the voltage at the voltage regulator installation point fluctuates between 8kV and 10kV, select a unidirectional voltage regulator with a voltage regulation range of 0-20%. When the voltage at the voltage regulator installation point fluctuates between 8.5kV and 10.5kV, select a unidirectional voltage regulator with a voltage regulation range of -5% to +15%. When the voltage at the voltage regulator installation point fluctuates between 9kV and 11kV, select a unidirectional voltage regulator with a voltage regulation range of -10% to +10%. For lines with new energy access, select a bidirectional voltage regulator with a voltage regulation range of -20% to +20%.

5. A distribution network-line-transformer-user hierarchical voltage regulation method as claimed in claim 1, characterized in that: The setting distance is 15km and the setting range is between -7% and +7%.

6. A distribution network-line-transformer-user hierarchical voltage regulation method as claimed in claim 1, characterized in that: The specific VQC strategy is: When the power factor is less than 0.9, if the voltage is lower than 0.9U N , the reactive power compensation device is put into use in groups until the power factor reaches the upper limit. If the voltage still does not meet the requirements, the on-load voltage regulator is adjusted to increase the voltage. If the voltage is higher than 1.07U N , adjust the on-load tap changer to reduce the voltage. After the voltage is qualified, the reactive power compensation device is removed in groups until the power factor is between 0.9 and 1, where U N is the qualified voltage.

7. A distribution network-line-transformer-user hierarchical voltage regulation method as claimed in claim 6, characterized in that: When the power factor is between 0.9 and 1, if the voltage is lower than 0.9U N , adjust the tap changer of the on-load voltage regulating distribution transformer to boost the voltage. If the tap changer is at the highest gear, capacitors should be put into use in groups. If the voltage is higher than 1.07U N , adjust the on-load voltage regulating distribution tap changer to reduce the voltage. If the tap changer is in the lowest position, remove the capacitors in groups.

8. A distribution network-line-transformer-user hierarchical voltage regulation method as claimed in claim 1, characterized in that: For the problem of bidirectional voltage over-limit of users in the substation, if the users have bidirectional over-limit at the same time, a substation line voltage regulator will be installed to solve the problem. If the users have bidirectional over-limit problem at different times, an on-load voltage regulating distribution transformer will be installed to solve the problem.

9. A distribution network-line-transformer-user hierarchical voltage regulation method as claimed in claim 1, characterized in that: On-site investigation and problem solving are as follows: In the case where the photovoltaic grid-connected capacity is less than the maximum capacity of the substation, check whether there is a problem of private photovoltaic connection. If there is a problem of private photovoltaic connection, correct the photovoltaic system ledger; check whether there are abnormalities in the monitoring data. If there are abnormal monitoring data, calibrate the monitoring equipment and add data verification steps to the equipment.

10. A power distribution station-line-transformer-user hierarchical voltage regulation system, which runs the power distribution station-line-transformer-user hierarchical voltage regulation method according to any one of claims 1 to 9, characterized in that: include: Substation voltage regulation module, used to perform time-segment AVC control on the 10kV busbar of the substation; The line voltage regulation module is used to regulate the voltage at the line level through the medium voltage line voltage regulator and the line reactive power compensation device; The distribution transformer voltage regulation module is used to solve the problem of the voltage exceeding the upper limit and the voltage exceeding the lower limit at the distribution transformer level through the off-excitation distribution transformer gear adjustment or the on-load voltage regulation distribution transformer VQC control; The transformer area voltage regulation module is used to solve the problem of transformer area voltage exceeding the upper limit, voltage exceeding the lower limit, and voltage exceeding the limit in both directions; The low-voltage user transformation module is used to carry out targeted transformation of individual low-voltage users.

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