直流配电系统拓扑结构及其在工程示范中的应用

Topological Structure of DC Distribution System and Its Application in Demonstration Projects

随着电动汽车充电桩、数据中心等直流型负荷和光伏等直流分布式电源的大量接入,传统交流配电系统暴露出不足。直流配电系统是实现直流负荷及直流型分布式电源的灵活接入,提高区域内高比例可再生能源并网和消纳的重要手段,因此,直流配电系统研究成为当前国内外研究热点之一。而拓扑结构研究是直流配电系统研究的基础和关键内容,拓扑结构也是直流配电系统应用示范工程需要优先考虑的问题,因而具有重要的研究价值。总结了国内外直流配电系统应用示范工程中采用的拓扑结构类型,归纳为单端辐射状、双端"手拉手"状、环状、多端网状4种基本的直流配电系统拓扑结构,分析了不同结构类型对系统运行具有的实际意义,并讨论了国内外主要直流配电系统示范工程中不同拓扑结构的应用场景、设备配置、保护方案等情况,同时进一步归纳总结了目前直流配电系统应用示范的建设情况,并对未来直流配电系统示范应用进行了研究展望。

With the increase of DC loads such as electric vehicle charging piles and data centers,and distributed generations such as photovoltaic batteries,traditional AC distribution system has exposed its shortcomings.DC distribution system is an important means to solve the flexible integration of DC loads and DC distributed generations,and improve the grid connection and consumption of high proportion of renewable energy locally.DC distribution system has become the research hotspot.DC distribution system topology is the fundamental and key content of the research of DC distribution system,and is also the priority of consideration in demonstration projects,which is an important issue to be solved.Based on the above background,the main topology types of DC distribution systems of demonstration projects are summarized as four types: single terminal radial structure,double terminal "hand in hand" structure,ring structure,multi terminal structure.Then the application scenario,equipment configuration and protection scheme of the main domestic DC distribution system demonstration projects are analyzed.Finally,the characteristics of DC distribution system application demonstration are further summarized and the research prospects for the future research of DC distribution system demonstration applications are put forward.