电力系统不同过程仿真中的核电机组数学模型研究

针对“核电机组单机容量普遍比火电机组大、运行特性不同于火电机组且在电力系统中比例不断升高从而给电力系统稳定运行造成影响”的问题,在前人建立的详细核电机组数学模型的基础上,建立了适用于电力系统中长期稳定性分析的核电机组数学模型,并在Simulink平台上,通过对单机无穷大系统的暂态稳定性仿真测试,考察了在暂态稳定性仿真中核电机组机械出力以及其他相关变量的变化.研究结果表明,在电力系统暂态稳定性分析中,核电机组机械出力和其他核电机组内部的相关变量变化很小,因此核电机组的机械功率可以当作恒功率来处理,这样可以极大地简化核电机组在电力系统暂态稳定性研究中的数学模型.

Mathematical model of nuclear power plants for different power system processes

Aiming at the capacity of nuclear power generating units is generally larger than that of thermal power generating units,the operational characteristics of nuclear power generating units are different from those of thermal power generating units,and the proportion of nuclear power rises in the power system which will cause a series of stability problems,a relative simple mathematical model of nuclear power generating unit was established on the basis of previous detailed models,which can be used in medium-term and long-term power system simulation.Through the transient stability simulation of the single machine infinite bus system in Simulink,the mechanical output and other relevant variables of nuclear power generating unit were observed.The results indicate that in transient stability simulation the mechanical output and other relevant variables change little.So the mechanical output can be treated as a constant.This will greatly simplify the mathematical model of nuclear power generating unit in power system transient stability simulation.