Simulation Research Of Trough Type Solar Aided 330MW Coal-fired Power Generation System

As a new way to generate electricity, solar aided coal-fired power generation system combines solar enengy with coal-fired unit, can not only use solar energy resource effectively, cutting the cost of solar thermal power generation, but also relieve the tension of fossil energy consumption, reducing environmental pollution, and realize the reasonable use of energy.In this paper, the static performance and dynamic performance of parabolic trough solar field and a 330 MW coal-fired unit are researched. The main achievements and innovations are as follows:(1) Based on the concentrated and energy conversion principle of trough type solar collectors, the dynamic mathematical models of solar collector and oil-water heat exchanger are built. And according to the working principle of thermal power plants, the mathematical models of heat, deaerator and so on are built as well.(2) Based on the mathematical model of the key equipment above in the system, the simulation model of solar collector is built on Star90 software simulation platform. Then through reforming the regenerative system of coal-fired unit, and using the equipments such as oil-water heat exchanger, the entire solar aided coal-fired power generating system model is completed.(3) A 330 MW complementary power generation system is selected as an example in this paper. When the extraction steam is replaced by thermal oil to preheat different flow of feedwater, the changing rule of the system operation parameters are analyzed. And in order to analyze the static performance of the system, the operating conditions of extraction steam which are complete replaced by thermal oil under different loads are simulated.(4) The process of launching system is simulated, and in order to analyze the real-time operation of complementary power generation system in actual weather conditions, the meteorological conditions in Lhasa is selected as an example. At last, the condition of direct solar radiation intensity with a crisis from 900W/m2 to OW/m2 is simulated and analyzed to study the dynamic performance of the system.