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电网技术  2014 

谐波责任定量评估的邻域多点测量方法

DOI: 10.13335/j.1000-3673.pst.2014.02.035, PP. 502-508

Keywords: 电能质量,谐波责任评估,邻域多点测量,复数域偏最小二乘方法

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Abstract:

准确计算公共连接点处系统侧等效谐波阻抗是谐波污染责任定量划分的前提。为进一步提高计算等效谐波阻抗的准确性,提出了邻域多点测量方法。该方法通过测量关注母线邻域内的主要谐波源信息,解释了背景谐波电压的大部分组成,降低了回归模型中常数项的波动性,从而构建了更为准确计算等效谐波阻抗的复数域线性回归模型。由于邻域内各主要谐波源的谐波电流产生交互影响,回归模型可能存在较为严重的相关性,因此复数域线性回归模型无法通过常规的最小二乘方法求解。仿照实数域偏最小二乘方法的构造,理论推导了复数域偏最小二乘方法,实现了带严重自相关性的复数域线性回归模型计算。采用IEEE14节点系统进行仿真,结果表明与传统方法相比,所提方法能够得到更加准确的谐波责任估计。

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