Research On Control Method Of Dish-Type Solar Thermal Power Generation System

As the world’s fossil energy is decreasing day by day and the environmental pollution caused by the burning of fossil fuels seriously damages the ecological environment,countries around the world gradually attach importance to the development and utilization of various renewable energy sources such as solar energy.Solar thermal power generation technology is one of the effective ways to develop and utilize solar energy,and its development prospects are relatively broad.Dish-Stirling(DS)is a kind of thermal power generation.Compared with the more mature trough and tower solar thermal power generation,the Dish solar power generation system has a series of advantages,such as simple structure,high power generation efficiency,low investment cost and wide application prospects.Therefore,the development of effective and reasonable dish thermal power generation system has become a hot spot at home and abroad.Solar thermal power generation is an important means of solar energy utilization,and the thermal storage system is an important part of the solar thermal power plant to ensure the reliability and economy of the power plant,its working conditions directly affect the normal operation of the solar thermal power plant.On the basis of reviewing relevant domestic and foreign literatures,this article deeply researches the working principle and working cycle method of Stirling engine.Then,in order to solve the influence of light changes on the output of the system,it was further proposed to couple the Stirling engine with the Doubly Fed Induction Generator(DFIG),and to cooperate with the Maximum Power Point Tracking(Maximum Power Point Tracking,MPPT),realizes the design from normal speed operation to variable speed operation,so that the entire system is less affected by light,and the output power is more stable than normal speed operation.The heat storage system is an important part of the solar thermal power station to ensure the reliability and economy of the power station.Its working status directly affects the normal operation of the solar thermal power station.This article uses a high-temperature molten salt heat storage unit to provide energy supply for the system At the same time,in order to improve the transient response of the system,the battery energy storage and heat storage are combined,and the hybrid energy storage is introduced into the system,so as to realize the long-term operation of the system without light and the lack of power when the light fluctuates.Supplement in time.In this paper,a Simulink simulation model with a hybrid energy storage system is built,and the control strategy of the entire system is proposed to realize the coordination of various parts.Through the coordinated control strategy proposed in this paper,the reasonable allocation between energy storage and heat storage can be made,and through the analysis of the energy storage capacity ratio,the long-term operation of the system can be realized at the minimum operating cost,and the output power and light can be significantly improved.Thermal conversion efficiency,improve the stability of the output voltage power,and then improve the voltage quality.