CN-114530857-B - Distributed coordination control method and system for regional voltage of power distribution network

Abstract

The invention belongs to the technical field of voltage regulation and control, and relates to a distributed coordination control method and a distributed coordination control system for power distribution network regional voltage, wherein the method comprises the following steps of S1, dividing a user side region, and connecting each user side region unit into a power transmission bus through a transformer; the method comprises the steps of S2, dividing a power supply side area, wherein each power supply side area unit is connected with an input bus through an inverter, S3, collecting voltage information of a transformer input end of each user side area unit, position data information of a transformer of each user side area unit and position data information of each power supply side area unit, inputting resistance value data of the bus, and S4, controlling the inverter of the power supply side area unit to adjust output voltage and then connecting the power supply side area unit with the input bus.

Inventors

• HUANG JIANHUI
• YONG RENZHAN
• YU WEIWEI
• HAO HAIGUANG
• GU GAOFENG
• YU FEIHU
• ZHAO YAN

Assignees

• 国网山东省电力公司乳山市供电公司

Dates

Publication Date

20260508

Application Date

20220110

Claims (6)

1. 1. The distributed coordination control method for the power distribution network regional voltage is characterized by comprising the following steps of: S1, dividing a user side area, namely dividing the user side area, and dividing user side area units by taking a user side transformer as a reference unit, wherein each user side area unit is connected with a power transmission bus through the transformer; s2, dividing a power supply side area, namely dividing the power supply side area, and taking an inverter connected with a power transmission bus as a reference unit to divide power supply side area units, wherein each power supply side area unit is connected with an input bus through the inverter; s3, data acquisition, namely acquiring voltage information of the input end of the transformer of each user side area unit, acquiring position data information of each power supply side area unit and acquiring resistance value data of an input bus; S4, the power grid access control step, namely controlling an inverter of the power supply side area unit to adjust output voltage and then access the input bus according to voltage information of a transformer input end of the user side area unit, position data information of a transformer of the user side area unit, position data information of the power supply side area unit and resistance value data of the input bus; In step S4, when the voltage data of the transformer input end of a certain user side area unit is lower than a preset threshold, according to the position data information of the transformer of the user side area unit, acquiring the position data information of the inverter of the power supply side area unit nearest to the transformer of the user side area unit, and according to the position data information between the two, acquiring the distance length between the two, according to the distance length and the resistance value of the input bus, acquiring the voltage loss value of the distance length, and according to the voltage loss value and the voltage data of the transformer of the user side area unit, regulating and controlling the output voltage of the inverter of the power supply side area unit; in step S4, when the inverter of the power supply side area unit closest to the transformer of the user side area unit cannot provide the voltage output, the inverter of the power supply side area unit closest to the transformer of the user side area unit is selected from the inverters other than the inverter of the closest power supply side area unit.
2. 2. The distributed coordination control method for the power distribution network regional voltage according to claim 1, wherein the power supply side regional unit is any power supply unit of a photovoltaic power supply unit, a wind power supply unit or a water conservancy power supply unit.
3. 3. The method according to claim 2, wherein in step S3, the corresponding position data information is obtained by a GPS positioning device.
4. 4. A power distribution network regional voltage distributed coordination control system, comprising: The user side area dividing module is used for dividing the user side area, dividing user side area units by taking a user side transformer as a reference unit, and connecting each user side area unit into a power transmission bus through the transformer; The power supply side area dividing module is used for dividing the power supply side area, dividing power supply side area units by taking an inverter connected with the power transmission bus as a reference unit, and connecting each power supply side area unit with the input bus through the inverter; The data acquisition module is used for acquiring voltage information of the input end of the transformer of each user side area unit, acquiring position data information of each power supply side area unit and acquiring resistance value data of an input bus; The power grid access control module is used for controlling an inverter of the power supply side area unit to adjust output voltage and then access the input bus according to voltage information of the transformer input end of the user side area unit, position data information of the transformer of the user side area unit, position data information of the power supply side area unit and resistance value data of the input bus; In the power grid access control module, when voltage data of a transformer input end of a certain user side area unit is lower than a preset threshold value, position data information of an inverter of a power supply side area unit nearest to the transformer of the user side area unit is obtained according to position data information of the transformer of the user side area unit, distance length between the user side area unit and the power supply side area unit is obtained according to the position data information between the user side area unit and the power supply side area unit, voltage loss value of the distance length is obtained according to the distance length and resistance value of an input bus, and output voltage of the inverter of the power supply side area unit is regulated and controlled according to the voltage loss value and the voltage data of the transformer of the user side area unit; when the inverter of the power supply side area unit closest to the transformer of the user side area unit cannot provide the voltage output, the inverter of the power supply side area unit closest to the transformer of the user side area unit is selected from the inverters other than the inverter of the closest power supply side area unit.
5. 5. The distributed coordination control system for power distribution network regional voltages as recited in claim 4, wherein said power supply side regional unit is any one of a photovoltaic power supply unit, a wind power supply unit, and a water conservancy power supply unit.
6. 6. The distributed coordination control system for power distribution network area voltage according to claim 5, wherein the data acquisition module acquires corresponding position data information through a GPS positioning device.

Description

Distributed coordination control method and system for regional voltage of power distribution network Technical Field The invention belongs to the technical field of voltage regulation and control, and particularly relates to a distributed coordination control method and system for power distribution network regional voltage. Background The reactive power optimization of the traditional power system is a control method for ensuring safe and economical operation of the system, and the reactive power output of a generator, the position of a transformer tap, switching of reactive power compensation equipment and the like are regulated so as to achieve the optimization targets of minimum active power loss and the like of the whole power system under the condition that the power system is ensured to meet the operation of constraint conditions. However, with the rapid development of power systems, solar photovoltaic power generation, wind power generation and water conservancy power generation, a large number of photovoltaic power sources, wind power sources and water conservancy power sources are connected into a power grid, and on one hand, the voltage out-of-limit risk is increased due to the connection of the power sources, and on the other hand, the original tide characteristics of the power grid can be changed, so that the running economy of the power grid is affected. For this reason, the invention patent with publication number CN106549392B provides a technical scheme of a coordination control method of a power distribution network, but the technical scheme still has the following technical problems: The power grid users or the power supply access with wide regional distribution range are not subjected to unified and effective coordination control, so that the regional distributed power grid users are easy to generate power grid disorder when the power supply is accessed to the power distribution network, and the safe and economic operation of the power distribution network cannot be ensured. This is a disadvantage of the prior art. In view of the foregoing, it is desirable to provide a distributed coordination control method and system for voltage distribution network area to solve the above-mentioned drawbacks in the prior art. Disclosure of Invention The invention aims to provide a distributed coordination control method and system for power distribution network area voltage, aiming at the defects in the prior art, so as to solve the technical problems. In order to achieve the above purpose, the present invention provides the following technical solutions: a distributed coordination control method for power distribution network regional voltage comprises the following steps: S1, dividing a user side area, namely dividing the user side area, and dividing user side area units by taking a user side transformer as a reference unit, wherein each user side area unit is connected with a power transmission bus through the transformer; s2, dividing a power supply side area, namely dividing the power supply side area, and taking an inverter connected with a power transmission bus as a reference unit to divide power supply side area units, wherein each power supply side area unit is connected with an input bus through the inverter; s3, data acquisition, namely acquiring voltage information of the input end of the transformer of each user side area unit, acquiring position data information of each power supply side area unit and acquiring resistance value data of an input bus; and S4, controlling the power grid access, namely controlling the inverter of the power supply side area unit to adjust the output voltage and then accessing the inverter into the input bus according to the voltage information of the transformer input end of the user side area unit, the position data information of the transformer of the user side area unit, the position data information of the power supply side area unit and the resistance value data of the input bus. Preferably, the power supply side area unit can be any power supply unit of a photovoltaic power supply unit, a wind power supply unit or a water conservancy power supply unit, and various different energy supply modes are connected into the input bus to improve the coverage range of energy utilization. Preferably, in the step S3, the corresponding position data information is acquired through the GPS positioning device, so as to improve the accuracy of the position data information. Preferably, in the step S4, when the voltage data of the transformer input end of a certain user side area unit is lower than a preset threshold, the position data information of the inverter of the power supply side area unit closest to the transformer of the user side area unit is obtained according to the position data information of the transformer of the user side area unit, the distance length between the two is obtained according to the position data information between the two, the voltage