Research on safe operation domain and control strategy of photovoltaic storage system under network voltage fault
In order to ensure the safe operation of the photovoltaic storage system,novel output control strategies are proposed and corresponding safe operation domains are constructed,as considering the cases that the voltage on the grid side drops asymmetrically.The control principle of positive and negative sequence separation is simply elucidated at first.Safe operation domains under each working condition are constructed,which are constrained by phase current amplitude,phase voltage amplitude and active fluctuation amplitude and meet the reactive current specified in the grid-connected standard.A fixed proportion control strategy for positive and negative sequence active current and a strategy for maximizing output active power control are proposed to satisfy the grid connection requirements and improve system stability.A simulation model of optical output system is created on Matlab/Simulink simulation platform,whose running results verify the effectiveness of the proposed strategy.
asymmetric faultPV-storage systemssafe operation regionreactive power supportoperation range constraint
NETL
NSTL
万方数据
