Study on stability control of dispatchable grid-connected PV system

In the context of environmental pollution and energy resources in the growing tension, solar energy as a new type of green and renewable energy has been paid for more and more attention. The most attention focuses on photovoltaic. But the stability of PV (photovoltaic) system output is poor, the grid will seriously affect the power quality. To ensure the normal operation of photovoltaic power generation system, energy storage is indispensable. This paper studies the dispatchable grid-connected PV systems with energy storage system. Bi-directional DC / DC converter as the main control circuit, a practical control charging and discharging strategy is presented, and by simulation to verify. The results show that the proposed control method can effectively stabilize the PV system output power fluctuations and the DC bus voltage, meet the requirements of charging and discharging, and increased charge speed and prolong the service life of battery.