A power distribution network regional voltage distributed coordination control method and system

Abstract

The application belongs to the technical field of voltage regulation, and relates to a power distribution network regional voltage distributed coordination control method and system. The method comprises the following steps: S1, a user side region division step, wherein the user side region is divided, and each user side region unit is connected to a power transmission bus through a transformer; S2, a power supply side region division step, wherein each power supply side region unit is connected to an input bus through an inverter; S3, a data acquisition step, wherein transformer input end voltage information of each user side region unit, position data information of the transformer of each user side region unit, position data information of each power supply side region unit and resistance value data of the input bus are acquired; and S4, a power grid access control step, wherein the inverter of the power supply side region unit is controlled to adjust the output voltage and then access the input bus.

Description

Technical Field

[0001] This invention belongs to the field of voltage regulation technology, specifically relating to a distributed coordinated control method and system for voltage in a power distribution network area. Background Technology

[0002] Traditional power system reactive power optimization is a control method used to ensure the safe and economical operation of the system. It aims to minimize the active power loss of the entire power grid while ensuring that the power system meets various constraints. This is achieved by adjusting the reactive power output of generators, the position of transformer taps, and the switching of reactive power compensation equipment.

[0003] However, with the rapid development of power systems, solar photovoltaic power generation, wind power generation, and hydropower generation, a large number of photovoltaic, wind power, and hydropower sources have been connected to the power grid. The connection of these sources increases the risk of voltage exceeding limits and alters the original power flow characteristics of the grid, affecting the economic efficiency of grid operation. To address this, invention patent CN106549392B provides a technical solution for a distribution network coordinated control method; however, this solution still has the following technical problems:

[0004] The lack of unified and effective coordination and control for power grid users or power source access across a wide geographical area makes it easy for grid disturbances to occur when regional distributed power users connect to the distribution network, thus failing to guarantee the safe and economical operation of the distribution network. This is a shortcoming of existing technology.

[0005] In view of this, it is very necessary to provide a distributed voltage coordinated control method and system for a power distribution network area to solve the above-mentioned defects in the prior art. Summary of the Invention

[0006] The purpose of this invention is to address the deficiencies of the existing technology by providing a method and system for distributed voltage coordination control in a power distribution network area, thereby solving the aforementioned technical problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A method for distributed voltage coordination control in a power distribution network area includes the following steps:

[0009] S1: Steps for dividing the user-side area: Divide the user-side area into user-side units based on the user-side transformer. Each user-side area unit is connected to the transmission bus via a transformer.

[0010] S2: Steps for dividing the power supply side area: Divide the power supply side area into units based on the inverter connected to the transmission bus. Each power supply side area unit is connected to the input bus through an inverter.

[0011] S3: The data acquisition steps are as follows: acquire the transformer input voltage information of each user-side area unit, acquire the transformer location data of each user-side area unit, acquire the location data of each power supply side area unit, and acquire the resistance value data of the input bus.

[0012] S4: The grid access control steps involve controlling the inverter of the power supply side area unit to adjust its output voltage and connect to the input bus based on the transformer input voltage information of the user-side area unit, the transformer location data of the user-side area unit, the location data of the power supply side area unit, and the resistance value data of the input bus.

[0013] Preferably, the power supply side area unit can be any power supply unit among photovoltaic power supply unit, wind power supply unit, or water power supply unit; by connecting multiple different types of energy supply methods to the input bus, the coverage of energy utilization is improved.

[0014] Preferably, in step S3, the corresponding location data information is obtained through a GPS positioning device to improve the accuracy of the location data information.

[0015] Preferably, in step S4, when the input voltage data of the transformer of a certain user-side area unit is lower than a preset threshold, the location data of the inverter of the power supply side area unit closest to the transformer of the user-side area unit is obtained based on the location data of the transformer of the user-side area unit. The distance between the two is then obtained based on their location data. Based on this distance and the resistance value of the input bus, the voltage drop value for that distance is obtained. Based on the voltage drop value and the transformer voltage data of the user-side area unit, the output voltage of the inverter of the aforementioned power supply side area unit is adjusted. The adjusted output voltage is connected to the input bus. After offsetting the voltage drop value, the voltage data at the input of the transformer of the user-side area unit can be improved; and it will not cause large voltage fluctuations; thus achieving stable voltage coordination.

[0016] Preferably, 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 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 nearest power supply side area unit.

[0017] The present invention also provides a distributed voltage coordination control system for a power distribution network area, comprising:

[0018] The user-side area division module divides the user-side area into units based on the user-side transformer. Each user-side area unit is connected to the transmission bus via a transformer.

[0019] The power supply side area division module divides the power supply side area by using the inverter connected to the transmission bus as the base unit to divide the power supply side area into units. Each power supply side area unit is connected to the input bus through an inverter.

[0020] The data acquisition module collects the transformer input voltage information of each user-side area unit, the transformer location data of each user-side area unit, the location data of each power supply-side area unit, and the resistance value data of the input bus.

[0021] The grid access control module controls the inverter of the power supply side area unit to adjust its output voltage and connect to the input bus based on the transformer input voltage information of the user-side area unit, the location data of the transformer of the user-side area unit, the location data of the power supply side area unit, and the resistance value data of the input bus.

[0022] Preferably, the power supply side area unit can be any power supply unit among photovoltaic power supply unit, wind power supply unit, or water power supply unit; by connecting multiple different types of energy supply methods to the input bus, the coverage of energy utilization is improved.

[0023] Preferably, the data acquisition module uses a GPS positioning device to obtain the corresponding location data information, thereby improving the accuracy of the location data information.

[0024] Preferably, in the grid access control module, when the input voltage data of the transformer at a certain user-side regional unit is lower than a preset threshold, the module obtains the location data of the inverter of the nearest power supply-side regional unit based on the location data of the transformer at that user-side regional unit. It then obtains the distance between the two based on their location data, and calculates the voltage drop value for that distance using the distance length and the resistance value of the input bus. Based on the voltage drop value and the transformer voltage data of the user-side regional unit, the module adjusts the output voltage of the inverter in the aforementioned power supply-side regional unit. The adjusted output voltage is connected to the input bus, which, after offsetting the voltage drop, improves the voltage data at the input of the transformer at the user-side regional unit without causing significant voltage fluctuations, thus achieving stable voltage coordination.

[0025] Preferably, when the inverter of the power supply side area unit closest to the transformer of the user-side area unit cannot provide voltage output, the inverter of the power supply side area unit closest to the transformer of the user-side area unit shall be selected from among the inverters other than the inverter of the nearest power supply side area unit.

[0026] The beneficial effects of this invention are that by dividing the user side and the power supply side into separate areas and locating their positions, the voltage can be connected to the input bus in a nearby coordinated manner, so as to avoid the disorder caused by the voltage connection to the input bus; and this technical solution fully considers the voltage loss caused by the transmission distance, and achieves accurate voltage value connection.

[0027] Furthermore, the design principle of this invention is reliable, the structure is simple, and it has a very wide range of application prospects.

[0028] Therefore, it is evident that the present invention has outstanding substantive features and significant progress compared with the prior art, and the beneficial effects of its implementation are also obvious. Attached Figure Description

[0029] Figure 1 This is a flowchart of a distributed voltage coordination control method for a power distribution network area provided by the present invention.

[0030] Figure 2 This is a schematic diagram of a distributed voltage coordination control system for a power distribution network area provided by the present invention.

[0031] Among them, 1-user-side area division module, 2-power supply-side area division module, 3-data acquisition module, and 4-grid access control module. Detailed Implementation

[0032] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following implementation methods.

[0033] like Figure 1 As shown in the figure, this embodiment provides a distributed voltage coordinated control method for a power distribution network area, which includes the following steps:

[0034] S1: Steps for dividing the user-side area: Divide the user-side area into user-side units based on the user-side transformer. Each user-side area unit is connected to the transmission bus via a transformer.

[0035] S2: The steps for dividing the power supply side area are as follows: the power supply side area is divided into units based on the inverter connected to the transmission bus. Each power supply side area unit is connected to the input bus through an inverter. The power supply side area unit can be any power supply unit among photovoltaic power supply units, wind power supply units, or hydropower supply units. By connecting multiple different types of energy supply methods to the input bus, the coverage of energy utilization is improved.

[0036] S3: The data acquisition steps include: collecting the transformer input voltage information of each user-side area unit, collecting the transformer location data of each user-side area unit, collecting the location data of each power supply-side area unit, and collecting the resistance value data of the input bus; obtaining the corresponding location data information through a GPS positioning device; and improving the accuracy of the location data information.

[0037] S4: The grid access control steps involve controlling the inverter of the power supply side area unit to adjust its output voltage and connect to the input bus based on the transformer input voltage information of the user-side area unit, the transformer location data of the user-side area unit, the location data of the power supply side area unit, and the resistance value data of the input bus.

[0038] When the input voltage of the transformer in a user-side area unit falls below a preset threshold, the location data of the inverter in the nearest power supply-side area unit is obtained based on the transformer's location data. The distance between the two inverters is then calculated, and the voltage drop across this distance is determined using this distance and the resistance of the input bus. Based on this voltage drop and the transformer voltage data of the user-side area unit, the output voltage of the inverter in the aforementioned power supply-side area unit is adjusted. The adjusted output voltage is then connected to the input bus. After offsetting the voltage drop, this improves the input voltage of the user-side area unit's transformer without causing significant voltage fluctuations, achieving stable voltage control.

[0039] When the inverter of the power supply side area unit that is closest to the transformer of the user-side area unit cannot provide voltage output, the inverter of the power supply side area unit that is closest to the transformer of the user-side area unit shall be selected from the inverters other than the inverter of the nearest power supply side area unit.

[0040] like Figure 2 As shown in the figure, this embodiment provides a distributed voltage coordination control system for a power distribution network area, comprising:

[0041] User-side area division module 1 divides the user-side area by dividing the user-side area into units based on the user-side transformer. Each user-side area unit is connected to the transmission bus via a transformer.

[0042] The power supply side area division module 2 divides the power supply side area by using the inverter connected to the transmission bus as the base unit to divide the power supply side area into units. Each power supply side area unit is connected to the input bus through an inverter. The power supply side area unit can be any power supply unit among photovoltaic power supply units, wind power supply units, or hydropower supply units. By connecting multiple different types of energy supply methods to the input bus, the coverage of energy utilization is improved.

[0043] Data acquisition module 3 collects the transformer input voltage information of each user-side area unit, the location data of the transformer of each user-side area unit, the location data of each power supply-side area unit, and the resistance value data of the input bus. In the data acquisition module 3, the corresponding location data information is obtained through a GPS positioning device to improve the accuracy of the location data information.

[0044] The grid access control module 4 controls the inverter of the power supply side area unit to adjust its output voltage and connect to the input bus based on the transformer input voltage information of the user side area unit, the location data information of the transformer of the user side area unit, the location data information of the power supply side area unit, and the resistance value data of the input bus.

[0045] In the grid access control module 4, when the input voltage data of the transformer of a certain user-side area unit is lower than a preset threshold, the module obtains the location data of the inverter of the nearest power supply-side area unit based on the location data of the transformer of the user-side area unit. It then obtains the distance between the two based on their location data, and calculates the voltage drop value for that distance using the distance length and the resistance value of the input bus. Based on the voltage drop value and the transformer voltage data of the user-side area unit, the module adjusts the output voltage of the inverter in the aforementioned power supply-side area unit. The adjusted output voltage is connected to the input bus, which, after offsetting the voltage drop, improves the voltage data at the input of the transformer of the user-side area unit without causing significant voltage fluctuations, thus achieving stable voltage coordination.

[0046] When the inverter of the power supply side area unit that is closest to the transformer of the user-side area unit cannot provide voltage output, the inverter of the power supply side area unit that is closest to the transformer of the user-side area unit shall be selected from the inverters other than the inverter of the nearest power supply side area unit.

[0047] The above-disclosed embodiments are merely preferred embodiments of the present invention, but the present invention is not limited thereto. Any non-creative variations that can be conceived by those skilled in the art, as well as any improvements and modifications made without departing from the principles of the present invention, should fall within the protection scope of the present invention.

Claims

1. A method for distributed voltage coordinated control in a power distribution network area, characterized in that, Includes the following steps: S1: Steps for dividing the user-side area: Divide the user-side area into user-side units based on the user-side transformer. Each user-side area unit is connected to the transmission bus via a transformer. S2: Steps for dividing the power supply side area: Divide the power supply side area into units based on the inverter connected to the transmission bus. Each power supply side area unit is connected to the input bus through an inverter. S3: The data acquisition steps are as follows: acquire the transformer input voltage information of each user-side area unit, acquire the transformer location data of each user-side area unit, acquire the location data of each power supply side area unit, and acquire the resistance value data of the input bus. S4: The grid access control steps are as follows: based on the transformer input voltage information of the user-side area unit, the location data information of the transformer of the user-side area unit, the location data information of the power supply side area unit, and the resistance value data of the input bus, the inverter of the power supply side area unit is controlled to adjust the output voltage and then connect to the input bus. In step S4, when the input voltage data of the transformer of a certain user-side area unit is lower than a preset threshold, the location data of the inverter of the power supply side area unit closest to the transformer of the user-side area unit is obtained based on the location data of the transformer of the user-side area unit, and the distance between the two is obtained based on the location data of the two. The voltage loss value of the distance is obtained based on the distance length and the resistance value of the input bus. The output voltage of the inverter of the power supply side area unit is adjusted based on the voltage loss value and the transformer voltage data of the user-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 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 nearest power supply side area unit.

2. The distributed voltage coordinated control method for a distribution network area according to claim 1, characterized in that, The power supply side area unit can be any power supply unit among photovoltaic power supply units, wind power supply units, or water conservancy power supply units.

3. The distributed voltage coordinated control method for a distribution network area according to claim 2, characterized in that, In step S3, the corresponding location data information is obtained through a GPS positioning device.

4. A distributed voltage coordination control system for a power distribution network area, characterized in that, include: The user-side area division module divides the user-side area into units based on the user-side transformer. Each user-side area unit is connected to the transmission bus via a transformer. The power supply side area division module divides the power supply side area by using the inverter connected to the transmission bus as the base unit to divide the power supply side area into units. Each power supply side area unit is connected to the input bus through an inverter. The data acquisition module collects the transformer input voltage information of each user-side area unit, the transformer location data of each user-side area unit, the location data of each power supply-side area unit, and the resistance value data of the input bus. The grid access control module controls the inverter of the power supply side area unit to adjust its output voltage and connect to the input bus based on the transformer input voltage information of the user side area unit, the location data of the transformer of the user side area unit, the location data of the power supply side area unit, and the resistance value data of the input bus. In the aforementioned grid access control module, when the input voltage data of the transformer of a certain user-side area unit is lower than a preset threshold, the position data of the inverter of the power supply side area unit closest to the transformer of the user-side area unit is obtained based on the position data of the transformer of the user-side area unit, and the distance between the two is obtained based on the position data of the two. Based on the distance and the resistance value of the input bus, the voltage loss value of the distance is obtained. Based on the voltage loss value and the transformer voltage data of the user-side area unit, the output voltage of the inverter of the aforementioned power supply side area unit is adjusted. When the inverter of the power supply side area unit closest to the transformer of the user-side area unit cannot provide voltage output, the inverter of the power supply side area unit closest to the transformer of the user-side area unit shall be selected from the inverters other than the inverter of the nearest power supply side area unit.

5. A distributed voltage coordination control system for a power distribution network area according to claim 4, characterized in that, The power supply side area unit can be any power supply unit among photovoltaic power supply units, wind power supply units, or water conservancy power supply units.

6. A distributed voltage coordination control system for a power distribution network area according to claim 5, characterized in that, In the data acquisition module, the corresponding location data information is obtained through a GPS positioning device.

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