An optimal operation method for cascade hydro-photovoltaic-pumped storage hybrid generation system

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Abstract
Since photovoltaic power stations and cascade hydropower stations have complementary characteristics, while pumped storage power stations have energy storage and rapid regulation characteristics, it is of great significant to combine cascade hydropower, photovoltaic, pumped storage to increase the absorption of photovoltaic. To improve the stability of the system operation and the economic benefits, this paper proposes a cascade hydro-photovoltaic-pumped storage hybrid generation system. Considering the actual conditions such as uncertainty of photovoltaic output, the reservoir capacity of pumped storage power station and real time electricity price, an objective function and related constraint conditions are established. In addition, a particle swarm optimization algorithm with linear decreasing of inertia weight is used to find the optimum results of the model. Finally, actual power station parameters are selected for simulation test and the results show that the hybrid generation system has good economic benefits and water-light complementary ability, which guarantee the system to operate more safely and economically.