Research of Hierarchical Control Strategy for Photovoltaic & Battery Storage System
According to the complementarity of photovoltaic and battery generation, the structure of photovoltaic and hierarchical storage system and its typical control methods are described in this paper, considering the demand of load side and distribution gird, hierarchical control strategy including primary control and secondary control is discussed, the model of converters and the control loop are presented in detail. The overall structure of hierarchical control composed by P-Q control and voltage-phase droop control is brief and cost-less. A simulation of the basic part in hierarchical control strategy under PSCAD/EMTDC environment is also included in this paper. The evaluation of hierarchical control strategy shows that photovoltaic and hierarchical storage system is practical for the application of distributed generators.