抑制分布式发电并网功率波动的直流电压随动控制策略

he grid-connected power fluctuation of renewable energy power generation has a negative effect on grid power quality, grid loss and grid safety. In this paper, a new method of suppressing grid-connected power fluctuation in situ is proposed. The specific program is installing a certain capacity capacitor on the DC side of grid-connected inverter, such as lithium ion supercapacitors. When the DC voltage follow-up control of the grid-connected inverter is implemented, the charge and discharge power of the capacitor is used to compensate the power fluctuation of the distributed renewable energy. Taking the PV grid-connected power generation system as an example, the simulation results show that the DC voltage follow-up control strategy can effectively suppress the power fluctuation of the distributed power generation system.?