核电机组原动机调节系统实测建模与仿真研究

Modeling Test and Simulation of Prime Mover and Governor for Nuclear Power Plant

随着核电在我国能源领域所占比重越来越高,核电机组与系统的交互影响日益引起重视。建立精确的控制系统模型来研究核电机组对电网扰动的动态响应,有利于提高研究电网稳定水平的能力。该文提出一种适用于压水堆核电站机组原动机调节系统的数学模型。通过△w-△δ坐标系,从机理上研究了模型参数对电力系统动态稳定的影响。结果表明:存在一个分界频率将频域分为正阻尼区域和负阻尼区域,该分界频率由原动机调节系统参数确定。通过对核电机组进行现场参数测试和在电力系统分析综合程序上进行仿真试验,验证了原动机及其调节系统模型与参数的准确性,并得出一般性结论。原动机调节系统模型参数对电力系统稳定性有重大影响,对其进行现场实测建模十分必要。提出的原动机调节系统模型及实测建模方法适用于压水堆核电站机组,建立的数学模型可用于电力系统稳定分析计算。

With proportion of nuclear power increasing in energy field of China, more and more attention is paid to the interaction between nuclear power units and system. The establishment of the precise model of the prime mover and control system is necessary for studying the dynamic response of nuclear power units to the disturbance in grid, and it can help to improve the ability of researching the stability level of power system. This paper presented a mathematical model for prime mover and regulation system in pressurized-water reactor（PWR） nuclear power plant. In the △w-△δ coordinate system, the effect of model parameters on power system dynamic stability was researched. The results show that there is a dividing frequency which divides frequency domain into positive and negative damping region. The dividing frequency is determined by the prime mover and its regulation system parameters. This paper verified the accuracy of the model and parameters by field testing in a nuclear power plant and simulation in power system analysis software package（PSASP）. A general conclusion is given that the prime mover and its regulation system have great influence on the stability of power system. The proposed prime mover and the control system model are suitable for PWR nuclear power unit, and the model and parameters got from the field test can be used for power system stability analysis and calculation.