基于Matlab-Simulink的详细核电机组数学模型研究

Study for a Detailed Nuclear Power Unit Mathematical Model Based on Matlab-Simulink

高阶数的核电机组数学模型结构复杂,仿真计算量大,计算时间也长;简化的核电机组数学模型,只能用来进行电力系统短期的稳定性分析,建立适用于电力系统中长期稳定性分析的核电机组数学模型显得很有必要。建立压水堆(PWR)核电机组数学模型,并在此基础上仿真分析了核电机组的固有特性,通过单机无穷大系统的仿真,简单研究了电力系统扰动对核电机组的影响,最终发现只要能及时切除故障,就不会对核电机组产生很大的影响。

The high-order mathematical model of nuclear power units is with complex structures, and is not suitable for applications because of massive and time-consuming simulation calculations. But the reduced mathematical model can be only used for the short-term stability analysis. So it is necessary to establish a mathematical model of the nuclear power units suitable for the mediumand long-term stability analysis of power systems. The mathematical model of the pressurized water reactor（PWR） nuclear power unit is hereby established. Based on this model, the inherent characteristics of the nuclear power unit have been analyzed. By the simulation of a single machine infinite bus（SMIB） system, the interaction between the nuclear power unit and the power system is also studied. As long as the fault is removed timely, there will be no great impact on the nuclear power units.