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针对压水堆核电厂的运行特性,研究核电厂接入电网后对电网低频振荡的影响,这对于核电厂及电力系统的稳定运行与及时实施有效地控制具有重要的意义。利用特征值分析法搜索2015年湖北电网中与大畈核电相关的振荡模式,并通过矩阵束分析法对扰动后的电网功率振荡曲线进行模态分析与曲线拟合来识别电网发生扰动后的主导振荡模式,最后在与该模式强相关的大畈核电机组上配置电力系统稳定器(power system stabilizer,PSS)来达到提高系统阻尼从而提高系统稳定性的目的。仿真结果表明,扰动后会激发电网中若干弱阻尼振荡模式从而引起大畈核电及其邻近地区发生较大幅度的功率振荡,而PSS的合理配置可以有效地抑制低频振荡从而保证系统的安全稳定运行。
In view of the operation characteristics of PWR nuclear power plant, the research on the impact of nuclear power plant on the low frequency oscillation of power grid after it is connected to the power grid is of great significance to the stable operation of nuclear power plant and power system and the timely and effective control. The eigenvalue analysis method was used to search the oscillation modes related to nuclear power generation in Hubei Power Grid in 2015 and the matrix analysis was used to identify the dominant power disturbance after grid disturbances by modal analysis and curve fitting Oscillation mode. Finally, a power system stabilizer (PSS) is configured on a large nuclear power plant with strong correlation with this mode to improve system damping and improve system stability. The simulation results show that after the disturbance, some weakly damped oscillatory modes in the power grid will be induced, which will cause large amplitude power oscillation in Dalai nuclear power and its adjacent area. However, the reasonable configuration of PSS can effectively suppress the low frequency oscillation and ensure the safe and stable operation of the system .