Feasibility Study On Joint Operation Of Pumped Storage-Solar System

With the development of national economy and society in China, not only power supply of power system should be continued to increase, but the quality of power supply is required to be higher. In order to make up the deficiency of the solar power, and also to adjust peak-valley difference of the power system, guarantee the operation with safety, stability and economy, building pumped storage power plant has been broad consensus by absorbing foreign experience. And we all know that pumped storage power plant has functions such like to reduce fuel consumption of electric power system, to change the energy structure, to response water contradiction between electric generation and irrigation, to adjust electricity transmission with long distance, etc. Therefore, the pumped storage-solar system combined operating is proposed, this system can not only make full of the solar energy resources, but improve the power quality and guarantee the operation of power grid stably, safely combined with pumped storage to generate power together.At first, this paper introduces the design method of the stand-alone PV system. Because, the solar energy has no regular changes, the load power is uncertain, and the characteristics of solar cells are instable, etc, all of above factors make the design of PV system be complex. It is generally to determine the solar cells capacity by consumption of the load while designing the PV system. At the same time, the standard of environmental value is introduced into the PV industry; evaluate the emissions pollutants environmental value in PV station compared with the coal electricity.Secondly, by the method of neural network, the model that the power prediction of PV power generation system is set up. In the model it only considers light intensity and temperature, predicts PV power by using of historical data of light intensity and temperature. And the results shows, the forecast precision meets the error demands. In addition, increasing influence factors can make predicted results be more accurate.Finally, the optimal operation model of pumped storage-solar system is set up. With the grid connected requirement of power system and local24hours load conditions, the paper establishes optimal profits model of the combined system. This model, from the point of the joint system, by use of pumped storage load FM role, not only realizes the full use of solar energy resources, but also can reduce the effect that PV system acts on the power grid because of the uncertainty of solar energy. Full considered the constraint conditions of the joint system, used the improved multi-objective optimization method NSGA-Ⅱ, the model verifies the pumped storage-solar system in access to power grid operating more safely and reliably, and it also verifies that the joint system can obtain higher benefits in contrast to pure PV power station.The research above proves that the joint operation of pumped storage-solar system can alleviate the effect on the power grid when photovoltaic power station has been in access to, and the combined system can provide users with more ideal, reliable electricity, and realize the maximization value of the solar energy and water resources.