Research On Key Technologies Of Medium-Low Temperature Trough Solar Thermal Power Thermal Storage System

Concentrating Solar Power(CSP)is an effective way to solve the outstanding contradiction between energy development and utilization and environmental protection.The medium-low temperature trough solar thermal power generation technology has its own advantages.The advantages of low cost,high reliability of power generation,and low risk of development and utilization have been favored by scholars and research institutions in various countries in recent years.As we all know,solar energy has the characteristics of low energy density and intermittent and unstable characteristics.In order to make the concentrating solar thermal power generation system have a sustained and stable power output,a thermal storage system is indispensable.This paper takes the thermal storage system of low-temperature solar thermal power generation as the research object,and conducts in-depth research on the thermal storage system to improve the utilization efficiency of the solar thermal power generation system.The main research content is as follows:First of all,comparing and analyzing several different heat storage methods and heat storage materials commonly used in CSP,and their respective advantages and disadvantages,the heat storage methods and heat storage materials suitable for medium and low temperature trough solar thermal power generation are established.Secondly,SAM software was used to study and analyze the two main factors affecting solar thermal power generation:the effect of solar multiple times and thermal storage time on the power supply of solar thermal power generation systems,and establishing the economic model of thermal storage systems with the goal of lowest electricity prices.The optimal capacity configuration of the thermal storage system.Thirdly,numerical simulation analysis is performed on the heat storage tanks of key equipments of the heat storage system.The best ratio of height to diameter is determined with the aim of minimizing heat dissipation,and stress analysis is performed on the heat storage tanks with the best ratio of height to diameter.Part of the structural optimization design.Finally,in order to solve the stability of microgrid system in operation,a comprehensive operation control strategy based on load balance optimization is put forward.Based on MATLAB/Simulink,a micro grid system model based on wind power generation is built,and the simulation of different operation modes of microgrid is carried out.The results confirm the effectiveness and correctness of the control strategy of the system in the different circumstances of the microgrid based on the wind power generation,so as to ensure the stability and reliability of the operation of the wind storage microgrid system,and improve the power quality.Finally,the layout and operation control strategy of the heat storage system are proposed so that the heat storage system can be better matched with the heat collection field and the power generation system,providing a certain degree of experience and reference of design and operation for the medium-low temperature trough solar thermal power generation heat storage system..