Research of DC Micro-grid Photovoltaic Energy Storage System Control Strategy

This document focuses on the DC micro-grid photovoltaic energy storage device, the design of energy storage systems are optical storage hybrid power system which composes the photovoltaic array, battery pack, management systems, photovoltaic inverter, load and power grid. According to the characteristics of the battery and the development of the switching device control technology, the charging and discharging control strategy of battery is studied. In this paper, three-phase inverter is based on the space vector control mode that is called SVPWM, after introducing the basic principle and synthesis method of SVPWM, the on-grid and off-grid system working mode control strategy is studied. Finally the control theory develops the inverter used in the optical storage complementary power generation system, and the article builds test platform to test system, verifying the validity of the control strategy.