暂态稳定分析中负荷模型主导参数研究

Dominant parameters of load model in transient stability analysis

从负荷参数对系统最大功角的影响、负荷参数对暂态过程中注入系统电流的影响(即对有功和无功功率的影响)、负荷参数初始值对灵敏度的影响3方面,详细比较了各负荷参数在暂态稳定分析计算中的灵敏度,最终确定对负荷特性起主导作用的负荷参数:保守地考虑,主导参数应选择恒定阻抗负荷所占有功比例、惯性时间常数、初始滑差、转子电阻;激进地考虑,主导参数可只选择恒定阻抗负荷所占有功比例和初始滑差。该结论可为负荷模型的降维在线快速辨识提供依据。

The sensitivities of load parameters in power system transient stability analysis are compared from three perspectives ：the impact of load parameters on the maximum angle of system;the impact of load parameters on the injected current during transient process;and the influence of their initial values on the load sensitivity,based on which,the dominant load parameters determining the load characteristics are ascertained. Conservatively speaking,the dominant load parameters should include the real power ratio of constant impedance load, the inertia time constant, the initial slip and the rotor resistance. More adventurously speaking,the dominant parameters may only include the real power ratio of constant impedance load and the initial slip. This conclusion may provide the basis for reducing the number of load model parameters in real-time load modeling.