光储联合发电系统不对称故障穿越控制策略OA北大核心CSTPCD

Aimed at the problems of output power from a photovoltaic(PV)power generation system and the two-fold fluctuation of DC-side voltage under grid asymmetrical fault,a low voltage ride-through control strategy for a PV-energy storage combined power generation system is proposed.During the low voltage ride-through period,the capacities of a PV grid-connected inverter and an energy storage converter are fully utilized to deliver active and reactive power to the grid.On this basis,the energy storage converter is made to adopt a negative-sequence voltage compensation control strat-egy based on negative-sequence virtual conductance.At the same time,the principles for one single and multiple energy storage converters participating in negative-sequence voltage compensation are analyzed,and an adaptive optimization design of negative-sequence virtual conductance is carried out.Simulation results show that the proposed control strategy can effectively reduce the output power from the PV power generation system and the two-fold fluctuation of DC-side voltage.