应用于户用储能系统的电池功率自适应下垂控制

以户用储能系统为研究对象,采用下垂控制调节电池功率,即由逆变器控制直流母线,电池的双向DC/DC控制器根据母线电压调节电池功率,该控制方法的优势在于方便实现多直流源并联。双向DC/DC变换器的电路拓扑采用交错式双向Boost变换器,并给出了下垂控制器的具体设计方法。针对系统中普遍存在的因电压采样偏差(逆变器与DC/DC变换器的电压采样是独立的,存在偏差)导致的功率控制偏差问题,提出了两种电池功率自适应控制策略:电压补偿和功率补偿,并给出了具体的实施方法。最后设计了一台5 kW样机,分别实现了两种策略,并进行了对比分析,实验结果验证了所提出策略的有效性。

Self-Adaptive Droop Control of Battery Power Applied in Residential Storage System

Residential storage system was studied,and droop control was adopted to regulate battery power. In this system,the bus voltage was controlled by the inverter,and the battery power was regulated by the bi-directional DC/DC controller of battery according to the sampled bus voltage. Inter-leaving bi-directional Boost converter was selected as circuit topology,while droop control was selected as control strategy. Two adaptive control strategy of battery power were proposed in detail in order to solve the common issue of power control error because of voltage sampling deviation(the voltage sampling of inverter and DC/DC converter are independent,resulting in sampling deviation),which were voltage compensation and power compensation. Finally,a 5 kW prototype was built and the two adaptive control strategies were both realized,and the effectiveness were verified by the experimental results.