Method and system for restoring power after fault of power distribution network containing DGs (distributed generation)

Abstract

The invention relates to a method and a system for restoring power after fault of a power distribution network containing DGs. According to the method, the DGs integrated in the power distribution network are processed in a classified manner according to the control method of the DGs and are divided into main power supplies and ordinary power supplies, wherein the main power supplies are controllable DGs, and the ordinary power supplies are random and uncontrollable DGs; and meanwhile, a standby contact wire is used as a main power supply, then, a multi-agent system for power restoration after fault of the power distribution network containing the DGs is established, and the optimum power supply scheme of a power-losing area is planned in a master-slave control mode. Compared with the prior art, the standby contact wire and the DGs integrated in the power distribution network are fully utilized in the restoration process, the power outage load is restored to the maximum, and the isolated island operation capacity of the DGs and randomness and volatility of output power are given full consideration, so that a restoration scheme can continuously and stably operate.

Description

technical field [0001] The invention relates to the technical field of quickly restoring power supply after a fault occurs in a distribution network, in particular to a method and system for restoring power supply after a fault in a distribution network including a distributed power source. Background technique [0002] In recent years, distributed generation (DG) such as wind power, photovoltaics, energy storage power stations, and micro gas turbines has attracted widespread attention due to its clean, renewable, and high-efficiency characteristics. As an effective supplement to centralized power generation, distributed generation connected to distribution Power grid has become an inevitable trend. After the distributed power generation is integrated into the distribution network, it brings new resources to the restoration of power supply after the distribution network fails, which can effectively improve the reliability of the power supply of the distribution network. How...

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Problems solved by technology

[0005] In the decision-making process of the power supply restoration scheme based on distributed power sources for power failure loads, the existing technologies have made a lot of simplifications to distributed power sources, and there are the following problems: 1. The control methods of different types of distributed power sources are not considered, but It is assumed that distributed power sources have the ability to operate in islands, but this is inconsistent with the actual situation. For example, distributed power sources such as wind turbines and photovoltaic panels are difficult to operate in islands; 2. Simplify distributed power sources as conventional controllable power sources processing, ignoring the randomness and volatility of distributed power output power, making it difficult for the restored island to operate sustainably and stably

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