The Modeling Of Pressurized Water Reactor Load-Following And The Optimization And Simulation Of It’s Power Control System

As of December2013, although our country’s nuclear power plants havebeen put into operation of17nuclear power units, with a total installed capacityof15million kilowatts, nuclear power generating capacity is not only less than2%of total electricity generation capacity throughout the year, but also far lessthan the global nuclear power generation on the average of all generatingcapacity of17%. Meanwhile, in2007, the National Development and ReformCommission had formulated and revised 《the long-term nuclear powerdevelopment planning (2005-2020)》to actively support the development ofclean energy of nuclear power. Nuclear capacity in the grid increasingproportion will increasingly urgent requirement to participate in nuclear powerpeaking units, so that nuclear power plants can conduct the load-followingoperation in a timely manner. Load-following operation unit can effectivelycoordinate grid load demand, and promote the stability of the grid frequencyand impact resistance, extending the cycle life of the reactor core,improvingoverall economic performance of nuclear power plant operation. This paper focuses on the theoretical modeling for load-following processof the Pressurized Water Reactor nuclear power plant, and the PWR powercontrol system for the load-following is combined by a kind of modified Smithpredictor-corrector control strategy to optimize.Firstly, the PWR power plant and it’s load-following relevant physicalknowledge are overviewed. Through the appropriate reasonable simplification,PWR equivalent single group of delayed neutrons point reactor kinetics modelsare derived, differential time models what describe the PWR load-following arededuced.In view of these, the state of these equations space model isestablished. Based on state-space model and the specific PWR power plant’soperating parameters’ datas, the PWR load-following transfer functions aresolved. According to the inherent characteristics of PWR, simulation modelsare validated, and the correctness of the models is confirmed;Secondly, the principle of a kind of modified Smith estimated corrector isanalyzed, then a method named modified Smith forecast correction strategythat is suitable for PWR nuclear power plant load following is put forwardbased on the idea to optimize PWR load-following power control system;Then, in the MATLAB/SIMULINK platform, conventional PID controland modified Smith predictor-corrector control system are respectively used totrack PWR power load control. The control characteristics of the controlsystems are analysisd and compared. Farthermore, the optimization of thecontrol system robustness analysis of simulation is done. The contrast simulation results show that the rapidity, accuracy and stability in the processthat the optimized control system regulates are significantly improved, thepower control system has strong robustness and it’s performance iscomprehensively improved. This facilitates reactor’s load-following mode ofoperation and improves the operational safety of nuclear powerplants.