基于选择性谐波补偿的APF最优安装点确定

Determination of Optimal Installation Point of Active Power Filter Based on Selective Harmonics Compensation

配电网存在大量的不确定谐波源和背景谐波,由于系统节点导纳矩阵的作用,滤波器的安装位置对谐波治理效果有明显的影响。以降低配电网电流畸变率为目标进行研究,优化有源滤波器的最优安装位置。基于谐波有功/无功划分原理,并得到各个母线注入补偿电流与畸变率的关系曲线,电流畸变率的取值符合国标要求时,得到各个母线滤波器对各次谐波的补偿状态以及对应的补偿电流。注入补偿电流最小的母线即为有源滤波器的最优安装位置。通过Matlab/Simulink搭建的配电网仿真模型进行仿真,仿真结果验证了该方法的可行性。结果显示,在畸变率达到并网要求的前提下,降低了滤波器的容量,并具有更好的经济性。

There are a large number of uncertain harmonic sources and background harmonics in distribution network.Due to the role of the system node admittance matrix,the installation position of a filter has a significant impact on the harmonic control effect.In this paper,the current distortion rate of distribution network is adopted as the objective func⁃tion to optimize the installation point of an active power filter(APF).Based on the principle of harmonic active/reactive power division,the curve of relationship between the compensation current injected by each bus and the harmonic dis⁃tortion rate is obtained.When the current distortion rate satisfies the international standard,the compensation states of the APF on each bus with respect to the harmonics of each order are obtained,together with the corresponding compen⁃sation current.It is found that the bus with the minimum compensation current is the optimal installation point of the APF.A simulation model of distribution network is constructed using Matlab/Simulink to conduct simulations,and re⁃sults verify the feasibility of the proposed method,indicating that under the premise that the distortion rate meets the grid-connected requirement,the capacity of the APF is reduced while a better economic efficiency is realized.