低碳“光储直柔”系统拓扑选型研究

Research on topology selection of low carbon"photovoltaics,energy storage,direct current and flexibility"system

低碳“光储直柔”系统不同应用场景的用能需求和负荷特性存在较大差异,且不同拓扑结构的“光储直柔”系统的经济性、供电可靠性等表现各异。为了形成适用于不同应用场景的“光储直柔”系统拓扑选型方案,首先基于“光储直柔”系统基本概念,分析了其基本结构以及系统运行原理和优势;然后针对不同场景用能需求差异,提出了“光储直柔”系统拓扑选型的经济性、可靠性和社会性指标;再次基于所提指标,比较分析了单端辐射状拓扑、三级辐射状拓扑和双端双母线拓扑间的差异,即“光储直柔”系统经济性和社会性效益与系统分布式光伏容量密切相关,双端双母线拓扑结构的供电可靠性和用电可靠性要均明显高于另外两种拓扑结构;最后提出了适用于不同应用场景的“光储直柔”系统拓扑结构选型方案。

The energy demand and load characteristics of low-carbon"photovoltaics,energy storage,direct current and flexibility"(PEDF)systems in different application scenarios differ greatly,and the performance of economy and power supply reliability of PEDF systems of different topologies is different.In order to form the topology selection scheme of PEDF system suitable to different application scenarios,this paper firstly analyzes the basic structure as well as the operation principle and advantages of the system based on the basic concept of PEDF system.Then,the economic,reliability and social indexes of the topology selection of PEDF system are proposed for different scenarios of energy demand.Based on the proposed indexes,the differences between single-ended radial topology,three-stage radial topology and double-terminal double-bus topology are compared and analyzed,i.e.,the economic and social benefits of the PEDF system are closely related to the distributed PV capacity of the system,and the reliability of power supply and power consumption of double-terminal double-bus topology are significantly higher than the other two topologies.Finally,the topology selection scheme of PEDF system for different application scenarios is proposed.