Island dividing method for power distribution network comprising distributed power supply

Abstract

The invention discloses an island dividing method for a power distribution network comprising distribute generation (DG). The island dividing method relates to the field of power supply technologies. The island dividing method implements the optimal island system formation method under the condition of considering output of the DG and load demand uncertainty, can determining the maximum possible island according to real-time situation, and has higher reliability when compared with an island under the condition of certainty. The island dividing method comprises the steps of: establishing a probability model of the DG and loads while considering output of the DG and load demand uncertainty, adopting a Monte Carlo method to carry out sampling tests, and predicting power supply output and load demand; simplifying a topological structure of the power distribution network into an undirected weighted graph while considering importance of the loads; solving an island dividing model by adopting an improved firefly algorithm to obtain a preliminary island; and adjusting and verifying the preliminary island by adopting a probabilistic power flow and sensitivity verification algorithm.

Description

technical field [0001] The invention relates to the technical field of power supply, in particular to an island division method for a distribution network containing distributed power sources. Background technique [0002] In the fault handling technology of power distribution system, the planned island scheme that makes full use of distributed power is a promising scheme. At present, the island division methods of distribution networks with distributed generation (DG) are studied, and these methods can be divided into two categories. One is to ignore the fluctuation of distributed power output and the uncertainty of load demand. Such methods usually form an initial islanding scheme based on the distribution of distributed power sources in the faulty power outage area, and then perform security checks on each island in the scheme to determine the final islanding scheme. The second category is fault recovery that takes into account the fluctuation of distributed power outpu...

AI Technical Summary

Problems solved by technology

[0003] However, in the actual operation process, the existing schemes all have the problem that the distributed power output and load changes will change the voltage of the nodes of the system and the network loss of the system.

In the recovery process of the faulty system, due to the strong uncertainty of the output of distributed power represented by photovoltaics and wind power, it has brought many uncertainties to the recovery of the faulty system and the safe operation of the island, and the existing scheme These uncertain factors are only dealt with in the form of fixed value or mean value, and there are often large errors in the fault recovery process, which makes the fault processing scheme of the distribution system based on the planned island mode have a large error problem

Images