基于部分变系数模型的多谐波责任量化方法

Method for Quantifying Harmonic Responsibilities of Multiple Harmonic Sources Based on Partially Varying-coefficient Model

为了消除背景谐波波动在多谐波源污染责任量化过程中的影响,提出了基于部分变系数模型的多谐波源污染责任量化方法。首先利用基本电路理论得到了公共连接点存在集中式多谐波源的等效电路模型,并推导了多谐波源的谐波污染责任定义及划分方法。其次针对背景谐波波动的特点,在多元线性模型的基础上进行改进,提出了部分变系数模型。最后,通过核函数的对比分析和光滑参数的交叉寻优,提出了基于该模型的谐波责任量化方法。所提方法能够在背景谐波波动情况下较准确地回归出系统侧谐波阻抗。为了验证方法的有效性,在IEEE14节点测试系统上进行仿真分析,结果表明,在背景谐波波动情况下,该方法能够有效提高多谐波源污染责任计算的准确度。

A method for quantifying the responsibilities of polluted multiple harmonic sources based on partially varying-coefficient model is proposed to eliminate the influence of background harmonic fluctuation.Firstly,this paper produces an equal circuit model where centralized multiple harmonic sources exist in PCC by using the basic circuit theory and the definition and deduces the definition and partition method of harmonic pollution responsibilities.Then,in view of the fluctuation of background harmonics,the paper proposes a partially linear varying-coefficient model based on improvement of the traditional multiple linear model.Finally,a method for qualifying harmonic pollution responsibilities based on this model is proposed by analyzing the kernel function and optimizing of smooth parameters.The proposed method could estimate the side harmonic impedance of the system when the background harmonic voltage is fluctuating.A simulation analysis is conducted on IEEE14-node test system to test the validity of the method and the result shows that the presented method is able to enhance the accuracy of quantization of harmonic pollution responsibilities when the background harmonic voltage is fluctuating.