基于负荷时域等值模型非线性度的谐波源定位

谐波源定位是划分电网谐波污染责任的关键理论和技术难题。基于产生谐波污染的非线性负荷的非线性度特性，研究负荷非线性度与负荷谐波发射水平的关系，提出了一种适合于单相和三相负荷的谐波源定位方法。该方法利用负荷时域等值模型确定负荷非线性特征，用删除残差法对负荷线性参数进行识别，计算负荷非线性度，以此确定负荷谐波发射水平，判定PCC点处主要谐波源，该算法能有效减少测量噪声影响。实验仿真及实际工程数据分析验证了该方法的有效性和准确性。

Harmonic Source Location Based on Non-linearity Index of Time-Domain Equivalent Model

It＇s difficult to determine the responsibility of the harmonic pollution which is produced by both the utilities and the customers. Due to the harmonic emission level in proportion to the nonlinear index of the load, an algorithm to calculate the nonlinear index of loads used in harmonic source location is proposed. Through the harmonic load model in time domain, the algorithm firstly calculates the nonlinear parameters of the load, secondly it computes the linear parameters of the same load by the delete residual method, then it estimates the non - linearity index and finally it finds the main harmonic source at the Point of Common Coupling. The proposed method can eliminate the measurement noise effectively in the data. The simulation analysis and the analytic result of the practical data testify that the proposed method is valid and accurate.