一种并离网一体型电池储能变流器

A Novel Converter for Battery Energy Storage Integrating Grid-connected and Standalone Operation Modes

研究了一种以T型三电平三相半桥为拓扑、集并离网工作模式为一体的电池储能变流器,阐述了变流器的拓扑结构和工作原理,分析了系统在2种工作模式不同的控制方式。构建了一台100 kVA全数字控制实验样机验证所提控制方式的可行性,实验结果证明了系统既能在并网工作模式下通过P/Q控制实现指定功率输出,又能在离网工作模式下通过V/F控制维持电压幅值和频率的稳定,符合两种模式的运行要求。

A novel converter for battery energy storage based on the three-level T-type three-phase half-bridge topology is studied which integrates grid-connected and standalone operation modes.The structure of the system and the working principle are analyzed,and different control strategies are designed accordingly for the two operation modes.A full digital control 100 kVA prototype is developed to verify the feasibility of the control strategies.Experimental results show that the system gives the designated power output via P/Q control under grid-connected operation mode and maintains the amplitude and frequency of the voltage via V/F control under standalone operation mode,satisfying operation requirements of both modes.