Optimal Design Of A Wind-Solar-Pumped Storage Power Supply System

At present,the continuous environmental degradation and energy shortage make the research focus on clearer energy such clean energy as wind energy and solar energy.However,the randomness and volatility of wind and photovoltaic resources will have a negative impact on the power system.In order to eliminate the unstable impact of the wind output,the power supply system needs to cooperate with the storage equipment such as pumped storage power station to ensure the stable output of the system.In this paper,wind turbine and photovoltaic array are used as power supply and pumped storage power station as energy storage equipment to study the feasibility of solar-wind-pumped storage power supply system.Firstly,the regional wind and photovoltaic resources are evaluated and forecasted.In this part,historical data of typical months are collected and the output models of wind turbines and photovoltaic arrays are studied.To evaluation of wind and photovoltaic resources,average wind speed,wind power density,available hours of wind energy and total solar radiation,sunshine hours and sunshine rates of solar energy are selected.Based on historical data,the Elman neural network predicts the regular pattern of future landscape resources,where the prediction results and historical data have very high fitting degree in magnitude and trend.It also expounds the complementarity of the two energy sources in time and the feasibility of using them as the basic data of the combined operation model of solar-wind-pumped storage power supply system.Then,this paper introduces the current research situation of solar-wind-pumped storage power supply system by taking pumped storage power station as energy storage module Through the existing research and the investigation of the actual regional data,it puts forward that the key problems of the combined operation system are the optimization of the system capacity ratio and the energy utilization ratio.Combining the future wind and solar data and output model and arranging the regional load curves,the necessity of the solar-wind-pumped storage power supply system is illustrated.In order to meet the requirements of energy utilization and economy of solar-wind-pumped storage power supply system at the same time,the target of energy utilization rate is defined as load power shortage rate and energy waste rate,and the target of economy is defined as purchase cost and operation and maintenance cost.Thus,a multi-objective optimization model of wind-solar storage combined operation suitable for the study area is constructed and this model is solved by genetic algorithm toolbox.With satisfying the load requirement of all typical months,the installed capacity of generating unit and the dispatching curve of pumped storage power station are finally determined.The operation model and solution results of the solar-wind-pumped storage power supply system show that the system can adjust the power supply instability caused by the randomness of wind and solar energy and prove that the combined operation mode is an effective way to utilize renewable energy.The conclusion shows that the system can achieve smooth output and improve the efficiency of wind farms and photovoltaic arrays under the condition of ensuring the highest energy utilization and the optimal system cost.In this study,practical problems are modeled and solved,whose better results provides theoretical support for practical engineering applications.