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电网技术  2013 

基于最小二乘及临界时变运行轨迹选择的与摆动次数有关的暂态稳定裕度分析

, PP. 450-454

Keywords: 动态运行轨迹,摆次稳定裕度,临界机群识别,二次函数拟合,临界轨迹选择

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Abstract:

系统运行轨迹,能够正确且唯一体现动态系统运行状态。在运行轨迹中识别出每摆次临界机群,细化了动态过程的分群方式。由于时变性导致的运行轨迹畸变,系统摆次稳定裕度预估误差较大。而在临界运行轨迹中获取其轨迹特征,且以时变因素考虑为原则选择需拟合的临界轨迹,并以最小二乘法来计算系统摆次稳定裕度,结果较为可信。基于动态运行轨迹,提出了关于摆次稳定裕度计算的临界轨迹选择思想,尝试改进临界机群识别方法,并在以二次函数最小二乘拟合虚拟轨迹曲线求取摆次稳定裕度方面做了一定研究。对某省电网进行了仿真验算,验证了研究方法的有效性。

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