In the wind-photovoltaic-storage hybrid power system based on gravity energy storage, a capacity optimization configuration method is proposed. Firstly, the capacity optimization configuration model of wind-photovoltaic-storage hybrid power system is established. Secondly, under the condition of different gravity energy storage capacity, the cat swarm optimization is used to optimize the capacity configuration of wind farm and photovoltaic power station. The optimal configuration meets the following indicators: utilize the complementary features of wind and photovoltaic, reduce the loss rate of power supply, increase the contribution rate of wind and photovoltaic, and ensure the minimum total cost of the system. Thirdly, the simulation analysis is carried out with data from a certain area of Gansu Province, China. The simulation results show that the proposed capacity optimization configuration method is reasonable and effective.
Keywords wind-photovoltaic-storage hybrid power system, gravity energy storage, capacity optimization configuration, evaluation index