基于输出电压校正的混合有源滤波器控制策略  

Hybrid active filter control based on output voltage correction

作　　者：徐永海[1] 温从溪[1] 

机构地区：[1]华北电力大学电气与电子工程学院,北京102206

出　　处：《电力自动化设备》2015年第5期36-43,共8页Electric Power Automation Equipment

摘　　要：提出了一种基于输出电压校正的混合有源滤波器(APF)控制策略。将APF控制成电压源,在比例控制的基础上,以系统剩余谐波电流作为反馈量,计算得到一个正弦信号作为APF输出电压的校正信号,以比例控制信号和校正信号之和作为APF输出电压的参考信号,实现APF输出电压校正,达到减小剩余系统谐波电流的目的。利用滑窗离散傅里叶变换方法检测系统剩余谐波电流的幅值和初相位,并给出了控制策略的参数确定方法和校正信号的计算方法。分别仿真分析了不同控制参数下、有无背景谐波情况下和负载不同变化剧烈程度下的滤波效果,并通过并联5次无源滤波器改善了负载变化剧烈时的动态滤波效果。仿真结果表明,所提出的方法参数选择简单有效,对负载谐波变化的响应速度快,谐波滤除率高,在系统含有背景谐波的情况下能够达到较好的滤波效果。A hybrid APF（Active Power Filter） control strategy based on output voltage correction is proposed, which controls APF as a voltage source. Based on the proportional control and with the residual system harmonic current as the feedback variable,a sinusoidal signal is calculated and taken as the APF output voltage correction signal. The sum of the proportional control signal and the correction signal is used as the reference signal of APF output voltage to realize the APF output voltage correction and reduce the system residual harmonic currents. The sliding window discrete Fourier transform is applied to detect the amplitude and initial phase of the system residual harmonic currents. The method for determining the control parameters and the method for calculating the correction signal are given. The filtering performance is simulated and analyzed for different control parameters,different background harmonics and different load change conditions. A parallel 5th passive filter is applied to improve the dynamic filtering effect when load changes significantly. The simulative results show that,with the proposed methods and control strategy,the parameter selection is simple and effective,the response to load harmonic variation is quick,the harmonic filtration rate is high and the filtering effect is good when system contains background harmonic.

关 键 词：有源滤波器 比例控制 输出电压校正 谐波分析 背景谐波 

分 类 号：TM461[电气工程—电器]