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系统持续扰动下的电力系统戴维南等值参数在线识别

DOI: 10.13334/j.0258-8013.pcsee.2015.08.009, PP. 1900-1908

Keywords: 参数识别,持续扰动,戴维南等值,最小二乘辨识法

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Abstract:

提出一种适用于系统侧持续扰动的电力系统戴维南等值参数在线识别方法。该方法将节点电压、电流变化量分解为负荷侧和系统侧的叠加,建立新的考虑系统侧变量的数学模型,并利用系统侧、负荷侧电流变量的相互独立性对模型进行求解。传统最小二乘辨识模型假设戴维南等值电势不变,而该方法没有这一假设,所以更能适用于系统侧持续扰动的情况。仿真及实际工程算例表明:与传统最小二乘辨识模型相比,在系统侧持续扰动较小时该方法能更好地识别出戴维南等值参数,而随着系统侧持续扰动的增大,最小二乘辨识模型逐步失效,所提方法依然能较好地识别出戴维南等值参数。

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