Control Strategy of Photovoltaic/Battery System Common DC Bus
The battery energy storage can stabilize the fluctuation of the photovoltaic (PV) power generation due to the environmental change.Based on the mathematical model of PV array and battery,this paper researches the control strategy of the PV/battery common DC bus.The hysteresis control strategy is adopted for DC bus voltage,and the battery charging and discharging are used to maintain the DC bus voltage stability.To prevent the battery from switching back and forth among working state and stopping state,the nonlinear function is taken for battery voltage outerloop control.With PSCAD/EMTDC software,the correctness and validity of the models and control strategies are simulated and verified.The simulation results show that PV system can connect the power grid with constant power under battery regulation,which will be the future trend of the PV systems.
PV systembatterycommon DC busvoltage outer-loop control
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维普
