Problems in power quality such as temporary drops in grid voltage and flickers have been caught attention with the increasing capacity of the new energy grid-connected systems, such as photovoltaic(PV) and photovoltaic storage. To solve these problems, a dynamic voltage restorer(DVR) for fault ride-through of photovoltaic energy storage systems is presented. We select the appropriate DVR topology and compensation strategy for PV energy storage systems which are used as energy supply equipment for DVR. It proves to be energy-saving and solves the instability of photovoltaic output effectively. The intelligent algorithm that optimized the controller parameter of dynamic voltage restorer is used and the effectiveness of the controller strategy proposed has been assessed by time-domain simulations in the MATLAB/Simulink platform.
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