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Reactive power control method and system for power distribution network

A distribution network and power control technology, which is applied in the direction of single-network parallel feed arrangement, etc., can solve the problems that affect the effect of reactive power control and cannot guarantee the ability of reactive power adjustment

Pending Publication Date: 2021-09-07
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When distributed photovoltaics are connected on a large scale, it is often impossible to ensure that each area has sufficient reactive power regulation capabilities, which affects the effect of reactive power control

Method used

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  • Reactive power control method and system for power distribution network
  • Reactive power control method and system for power distribution network
  • Reactive power control method and system for power distribution network

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] A schematic flow chart of a reactive power control method for a distribution network provided by the present invention is as follows figure 1 shown, including:

[0077] Step 1: Obtain the raw data of the distribution network; specifically include:

[0078] Input the original data of the power distribution network that needs to be partitioned, including network parameters such as transformer and line impedance, capacity of parallel reactive power compensation device, active and reactive load data of each node, number of required partitions, and solution algorithm parameters. The source of the original data can be obtained through effective measurement means, and the power flow calculation can be performed on the distribution network that needs to be partitioned.

[0079] Step 2: According to the original data, calculate the electrical distance between each node in the distribution network, the nodes include load nodes and reactive power sources; specifically include:

...

Embodiment 2

[0124] The simulation calculation is carried out in the IEEE 33-node power distribution system, the system reference voltage is 12.66kV, and the reference capacity is 10MVA. The network structure of high-penetration photovoltaic access to 33-node distribution network Figure 4 , distributed power sources are respectively connected to nodes 7, 10, 13, 15, 17, 19, 23, 26, 28, and 31 as reactive power sources, and other nodes are load nodes; the capacity of distributed power sources is 0.1p.u.; The photovoltaic penetration rate of the power grid is 50%; the number of partitions k=3; the weight coefficient of the regional reactive power balance redundancy index of the distribution network partition index is 0.5, and the weight coefficient of the coupling degree index inside and outside the region is 0.25, that is, α 1 = 0.5, α 2 = α 3 = 0.25; the weight coefficients of controllability index and observability index of distribution network dominant node selection index are both 0....

Embodiment 3

[0131] Based on the same inventive concept, the present invention also provides a distribution network reactive power control system. Since the principle of these devices to solve technical problems is similar to that of the distribution network reactive power control method, repeated descriptions will not be repeated here.

[0132] The basic structure of the system is as Figure 6 As shown, including: data acquisition module, electrical distance module, grid partition module, leading node module and reactive power compensation module;

[0133] Among them, the data acquisition module is used to obtain the original data of the distribution network;

[0134] The electrical distance module is used to calculate the electrical distance between nodes in the distribution network according to the original data, and the nodes include load nodes and reactive power sources;

[0135] The power grid partition module is used to input the electrical distance into the pre-established partiti...

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Abstract

The invention provides a reactive power control method and system for a power distribution network. The method comprises the steps of acquiring original data of the power distribution network; according to the original data, calculating the electrical distance between nodes in the power distribution network, wherein the nodes comprise load nodes and reactive power sources; inputting the electrical distance into a pre-established partitioning model to obtain an optimal partitioning scheme of the power distribution network; based on the optimal partition scheme, inputting the electrical distance into a pre-established dominant node selection model to obtain dominant nodes in each partition; and monitoring the voltage of the dominant nodes in each partition, judging whether the voltage is out of limit or not, and performing reactive compensation in the partition on the dominant nodes with the voltage out of limit. According to the invention, each region has enough reactive power condition capability through partitioning, and reactive power compensation is carried out through the dominant nodes to improve the reactive power voltage control effect of the active power distribution network; and long-distance transmission of reactive power in the power distribution network is avoided, and reactive power on-site balance is achieved.

Description

technical field [0001] The invention belongs to the technical field of distributed power grid connection, and in particular relates to a reactive power control method and system for a distribution network. Background technique [0002] The penetration rate of distributed photovoltaic in the distribution network is getting higher and higher, and the randomness of photovoltaic power generation increases the uncertainty of the distribution system, which brings severe challenges to the reactive power and voltage control of the distribution network. Improper reactive voltage control may increase the flow of reactive power in the line, leading to increased network losses. [0003] Distributed photovoltaics are connected to the grid through inverters and have reactive power adjustment capabilities. They can coordinate with traditional reactive power adjustment equipment such as shunt capacitors in the distribution network to control node voltages, thereby increasing the reactive po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/50H02J3/38
CPCH02J3/50
Inventor 赫卫国徐晓春叶荣波华光辉周昶刘海璇吴晓飞黄晓剑刘皓明梅飞
Owner CHINA ELECTRIC POWER RES INST
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