基于谐波阻抗矩阵约束的系统侧谐波阻抗估计方法

Utility harmonic impedance estimation method based on harmonic impedance matrix constrain

谐波阻抗是谐波治理和谐波责任划分的重要参数,针对背景谐波波动的随机性,考虑基于诺顿等效电路方程的固有特点,提出一种基于谐波阻抗矩阵约束的谐波阻抗估计方法。针对复值信号在复数独立分量分析法的求解过程中存在的相角偏移问题,将谐波阻抗矩阵的结构加入复数独立分量分析的迭代过程中对其分离矩阵进行约束。分别基于符号判别法和比例缩放法解决次序不确定和幅值不确定性问题。所提方法对背景谐波波动适应性强,对数据点需求量少。仿真和实测结果说明了所提方法的正确性和有效性。

Harmonic impedance is an important parameter for harmonic contribution quantification and harmonic mitigation.Aiming at the randomness of the background harmonic fluctuations and considering the essential characteristics of the equation based on the Norton equivalent circuit,a utility harmonic impedance estimation method based on harmonic impedance matrix constrain is proposed.To solve the phase offset of the complex-value in the process of CICA(Complex Independent Component Analysis method),the impedance matrix is added to the iteration process of CICA to restrain the separation matrix.The order uncertainty and the scale uncertainty are respectively solved based on symbol discriminant method and proportional coefficient method.The proposed method is adaptable to background harmonic fluctuation and requires less data points.The results of simulation and field test illustrate the correctness and effectiveness of the proposed method.