Design of Grid-connected Power Control System Based on Combined Power Generation of Wind Turbine, PV and Second-used Battery

The installed capacity of new energy power generation in China has broken new records for many times in recent years. However, as the installed capacity of new energy takes up a larger proportion in the power grid, it also brings great challenges to the safe and stable operation of the power grid. The defects of endowment of the new energy, represented by wind turbine and photovoltaic, are randomness volatility and intermittent. In order to improve the control ability of new energy generation when natural resources change, it brings a new operation mode to combine wind turbine PV and second-used battery to improve the stability of the new energy generation to reach the same level with thermal power. At the same time, the paper studied the grid-connected control strategy based on PQ control, building the microgrid grid-connected MATLAB/Simulink simulation model based on PQ control, providing the construction method of each sub-module and the calculation and design method of related control parameters. Finally, the effectiveness of the control system design was verified by Simulink simulation.