A Dispatching Method for Multi-point Distributed Power Distribution System Based on Power Electronic Transformer

Abstract

The invention relates to a multi-point decentralized distribution system operation strategy based on a power electronic transformer, belonging to the technical field of grid-connected cooperative operation of a micro-grid. At steady state operation of that entire distribution system, Firstly, the controllable unit scheduling method of distribution system is obtained by optimizing calculation in dispatching center. Secondly, the distributed units in DC micro-grid are controlled by the individually adjustable voltage of low-voltage side of power electronic transformer to adjust the output power,so as to realize the optimal operation of wind-solar-storage complementarity and the peak-clipping and valley-filling of distribution network. At the same time, by using the adjustable power factor of AC side of power electronic transformer, the power flow of AC distribution network can be controlled in real time, and the power flow optimization of distribution network can be realized. The methodof the invention has the advantages of simple structure, clear hierarchy and easy realization, can save the hardware communication cost and simplify the system control, and fully exerts the functionof the power electronic transformer in the operation of the distribution system with multiple DC micro-grids connected to the grid. The method has wide adaptability and expansibility.

Description

technical field [0001] The invention relates to a dispatching method for a multi-point distributed power distribution system based on a power electronic transformer, and belongs to the technical field of grid-connected coordinated operation of a power grid. Background technique [0002] In order to solve many problems in the utilization of distributed energy resources, microgrids have received more and more attention from researchers. According to the difference between distributed power sources and loads connected to the bus, the microgrid is divided into AC microgrid and DC microgrid. Phase problems, and easier voltage control, have certain advantages over AC microgrids; if DC microgrids are supported by large power grids, it is easier to maintain power balance inside the microgrid and improve operational stability. For the distribution network, the microgrid integrates and then centralizes various distributed resources, which can not only reduce the impact of renewable e...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a multi-point distributed power distribution system dispatching method based on power electronic transformers, through which power electronic transformers can perform energy management and optimal dispatch on multi-point distributed systems connected to multiple DC microgrids through distribution networks , aiming at the problem that the master-slave control of each unit in the microgrid faces excessive communication pressure and is difficult to realize when the DC microgrid is connected to the grid, according to the AC distribution network and its connected DC microgrid in the multipoint distributed power distribution Structural characteristics and operation mode, the entire multi-point distributed power distribution system is divided into power distribution system scheduling layer and voltage collaborative control layer for energy management

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