基于功率偏差估计主导区间模式下的参与因子与参与方向

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提出一种基于功率偏差估计主导区间模式下参与因子与参与方向的方法。该方法首先利用参数化时域辨识方法提取受测振荡功率信号中的各模式分量,并由一个新的指标(模式能量级日确定主导区间模式。然后,计算该模式对应的右特征向量的归一化幅值和相对相位,继而估算各大区机群和主力电厂的参与因子。最后,借助△娠型相位引入参与方向信息,形成新的概念——参与度振型。它可以为运行人员提供主导区间模式下区域同调机群和主力电厂的参与程度和参与方向的合成信息,亦可为在线准实时识别或分类强相关区域、电厂甚至机组提供参考。利用一个扩展的IEEE 3机9节点算例对文中方法的适用性进行了验证,并讨论了工况与模型详细程度对结果的影响。案例分析在一个华东电网规划系统中展开,结果表明了该方法的有效性。
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