Modeling And Simulation Of PWR Nuclear Power Plant And Grid-Connection Influence

With the development of nuclear power,the problem of power system peaking is more and more prominent.Due to the high safety requirements of nuclear power plants,it is very important to ensure the smooth operation of both the power system and the nuclear power units when the nuclear power is involved in peaking shaving.The existing nuclear power plant simulation platform is not suitable for direct use in power network simulation research.due to its complex system.According to the characteristics of typical PWR nuclear power units in China and the requirements of grid simulation,the main models of PWR units are modeled.The simulation model includes the core neutron kinetic model,the heat transfer model of the thermal system in the reactor,the model of the cooling pipe and the heat pipe,the model of the steam generator,the reactor power control system model,the main pump model,the turbine and its governor model.Firstly,according to the demand of power grid simulation,the main system and equipment of nuclear power plant are modeled,and the mathematical model of main system and equipment is deduced on the basis of requirement analysis.Combined with the operation principle of the reactor and the characteristics of self-stabilization and self-tuning,the accuracy of each model is qualitatively verified.The semi-physical simulation platform of nuclear power station was completed and the simulation results of the semiphysical simulation platform and simplified model of nuclear power station unit were verified.The verification results show that the trend of transient process is consistent,and the steady-state error is within the allowable error range,which can meet the needs of grid simulation.Finally,the paper analyzes the preliminary adaptability of nuclear power generating units connected to the power grid.The results show that the frequency of the power grid has a great influence on the power level of the power unit.The change of voltage has little effect on the nuclear power unit.Compared with the existing complex nuclear power plant model,the model used in this paper has been greatly simplified.Moreover,the transfer function modeling adopted in this paper can be better integrated into the environment of the simulation of the power grid.