用于电池储能系统并网的PCS控制策略研究

Study of PCS's control strategy for battery energy storage grid-connected system

介绍了两级式能量转换系统(Power Conversion System,PCS)的主电路拓扑和数学模型,并对其控制策略进行了研究。为确保储能电池组的安全以及延长其使用寿命,采用先恒流充电至额定电压后再转恒压充电的二阶段模式。针对充放电分离控制复杂的控制架构,提出了基于电池侧和网侧变流器主从功率控制的统一控制策略。仿真及实验结果均与理论分析一致,变流器动静态性能良好,达到了控制要求。

This paper analyzes the main topologies and mathematical model of Power Conversion System, called PCS, and also studies its control strategy. The two-stage charging model, first constant current charging to the rated voltage and then transferred to constant voltage charging, is used to ensure the safety of storage battery and prolong the service life. In order to avoid the shortages of the traditional charge and discharge control method, the unified control strategy of charging and discharging is proposed, based on that, grid-side and battery-side converters are respectively designed to work in passive and active power control. The simulation and experimental results are consistent with the theoretical analysis, the converter achieves good dynamic and static performance, control requirements.