不平衡畸变电网电压下的谐波检测  

Harmonic Detection Under Unbalanced and Distorted Grid Voltage

作　　者：张晓宇[1] 谢运祥[1] 

机构地区：[1]华南理工大学电力学院,广东广州510641

出　　处：《电力电子技术》2016年第8期41-43,共3页Power Electronics

基　　金：广东省教育部产学研结合项目(2011B090400136)~~

摘　　要：此处分析了三相四线制有源电力滤波器(APF)基于佛布迪(FBD)的谐波电流检测算法,针对它在不平衡畸变电网电压下的不足,提出一种改进的谐波电流检测算法。该方法利用三角函数矩阵与电网电压运算,得到基波正序电压,再基于单同步坐标系软件锁相环(PLL)实时跟踪基波正序电压的相位,进而快速求取谐波指令电流。仿真分析和实验结果验证了该方法的检测结果不受电网电压不平衡和畸变影响。The fryze-buchholz.depenbrock（FBD） method in detecting harmonic currents of three-phase four-wire shunt active power filter（APF） is analyzed.Aiming at the deficiency of the traditional method under unbalanced and distort- ed gird voltage, an improved detection method is proposed.The fundamental positive sequence voltage is extracted by the multiplication with trigonometric function matrix and system voltage, and then the frequency and phase of the fun- damental positive sequence voltage is got based on single synchronous reference frame software phase locked loop（PLL）. Then the compensated current is obtained quickly.Simulation and experimental results verify that the correctness of this method is not affected by the asymmetry and distortion of the grid voltage.

关 键 词：有源电力滤波器 谐波检测 锁相环 

分 类 号：TN713.8[电子电信—电路与系统]