Coordinated Control Strategy for Operation Mode Switching of DC Distribution Networks  

作　　者：Jianqiang Liu Xiaoguang Huang Ying Hong Zuyi Li 

机构地区：[1]the School of Electrical Engineering,Beijing Jiaotong University,Beijing 100044,China [2]Galvin Center for Electricity Innovation,Illinois Institute of Technology,Chicago 60616,USA

出　　处：《Journal of Modern Power Systems and Clean Energy》2020年第2期334-344,共11页现代电力系统与清洁能源学报（英文）

基　　金：supported by Fundamental Research Funds for the Central Universities(No.2019JBM057)。

摘　　要：Due to the advantages such as low line cost,low transmission loss,and high power supply reliability,DC distribution networks have become the main development trend for future distribution networks.In this paper,a typical DC distribution network with multiple voltage levels is considered as a research object.It is proposed that the interface converters between DC buses with different voltage levels be implemented through the series-parallel combination of full-bridge LLC resonant converters.To realize the decentralized self-discipline control of DC voltage under various working conditions,different slack buses are prepared according to the voltage ranges of the DC buses,and the voltage regulation modes of the DC distribution network are divided into main voltage regulation mode,backup voltage regulation mode,and off-grid voltage droop regulation mode.By introducing a voltage coefficient related to DC voltage deviation as a basis for mode switching,the voltage fluctuations caused by slow switching between control modes in the method of traditional voltage margin control is reduced,facilitating fast and smooth switching between different voltage regulation modes.Finally,a simulation model for DC distribution networks is constructed utilizing MATLAB/Simulink.Simulation results verify the effectiveness and feasibility of the proposed voltage regulation modes and switching methods for DC distribution networks.Finally,an experimental platform is also constructed to verify the feasibility of the mode switching method proposed in this paper.

关 键 词：DC distribution network decentralized self-discipline control voltage regulation mode mode switching 

分 类 号：TM732[电气工程—电力系统及自动化]