Design method for access of flexible multi-state switch to distribution network

Abstract

Provided in the invention is a design method for access of a flexible multi-state switch to a distribution network. On the basis of simulation of a multi-scene power flow, distribution network weak positions including distribution network node voltage limiting exceeding and line load heavy loading and the like after access of a distributed power source are calculated and analyzed and a flexible multi-stage switch access location is determined; a system optimization model of access of the flexible multi-stage switch to the distribution network using economic cost minimization as an objective function is established, wherein the objective function includes a yearly conversion cost and a system operation loss cost of initial investment of the flexible multi-stage switch and various constraintconditions are met; with an improved particle swarm optimization method based on a genetic algorithm (GA-PSO), an optimization design model including discrete variables and continuous variables of the flexible multi-state switch is calculated, mixed coding is carried out on the complicated discrete variables and continuous variables, and crossover and mutation operations of the genetic algorithmare introduced into a particle swarm optimization method for improvement; and thus an optimization design plan for access of the flexible multi-state switch to the distribution network is obtained byoptimization calculation.

Description

technical field [0001] The invention relates to a design method for connecting a flexible multi-state switch, in particular to an optimal design method for connecting a flexible multi-state switch to a distribution network. Background technique [0002] The flexible multi-state switch adopts the new technology of power electronics, which not only has two states of on and off, but also adds a continuous controllable state of power. It is the key supporting equipment in the future smart distribution network to solve problems such as power supply interruption and ring closure impact, and at the same time, it can promote the equalization of feeder load distribution and the improvement of power quality. However, at present, the main research work on flexible multi-state switches is focused on the research and development of devices, topology design, operation control, and integration testing. Most of them are manually designed with engineering experience, and the location and ca...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art, and solve the problem that the design of the existing flexible multi-state switch connected to the distribution network does not consider in detail the dual volatility of the distributed power supply and the load in the distribution network, and the flexible multi-state switch and the distribution network Optimizing the matching relationship of the middle tie switch leads to the problem that the design result is difficult to adapt to the future technical economy. An optimal design method for the flexible multi-state switch connected to the distribution network is proposed.

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