独立光伏系统的储能变换器并联控制研究

Research on Parallel Operation of Power Storage System Based on Standalone PV System

大容量储能系统是解决独立光伏系统输出随机性、间歇性对供电质量和可靠性影响的有效途径。但由于受开关器件电应力和成本限制,单台储能变换器通常难以满足大容量储能需求,模块化并联技术是实现大规模储能的有效方法。这里针对两台用于独立光伏系统的储能变换器,提出并采用一种适用于大容量储能装置的分散逻辑并联策略,分析了其基本原理并设计了相关的重要控制参数。实验结果验证了此策略正确、可行。

Energy storage system is an effective way to eliminate the impact on power quality and reliability due to the output randomness,intermission in standalone photovohaic（PV） system.However,the capacity of single converter can hardly meet the demand of energy storage due to the restriction of the stress and cost of switching device.Modularity parallel technique is an effective method to achieve the goal of large capacity.This paper presents a novel parallel strategy which is well applied in large-capacity system.The basic principle of this strategy is analyzed and important control parameters are designed.Experimental results verify the feasibility of this control strategy.