基于FFT的单相串联型有源电力滤波器设计  

Design of single phase series active power filter based on FFT

作　　者：孟彦京[1] 周鹏[1] 王素娥[1] 

机构地区：[1]陕西科技大学电气与信息工程学院,陕西西安710021

出　　处：《电子技术应用》2015年第7期136-139,143,共5页Application of Electronic Technique

基　　金：陕西省教育厅专项资助项目(2013JK1065)

摘　　要：设计了基于FFT的单相串联型有源电力滤波器(APF),它具有动态响应快、不受电网、负载运行条件的约束、能很好补偿低次电压谐波等特点。采用FFT算法得到电网电压谐波的频率、幅值、相位信息,控制逆变器产生一个与电网谐波幅值相等、频率相同、相位相反的谐波电压补偿原来电网电压谐波;并优化了过零检测电路,使其拥有较强抗干扰性的同时不会产生相位差。通过实验表明基于FFT的单相串联型APF可以很好地补偿低频电压谐波,使电网电压THD<3%。This paper designs a kind of single phase series active power filter （APF） based on FFI＇, which has fast dynamic response, without constraints on conditions of load operating and can compensate the low-order harmonics. The frequency, amplitude and phase of harmonics are obtained by FFT analysis, and a harmonic signal is produced by means of inverter, of which the amplitude and frequency are equal to the grid voltage harmonics, but phase is opposite. Furthermore the zero crossing detection circuit is optimized to make it has better anti interference performance and no phase difference. The results of the experiment show that the active power filter can filter majority of the harmonic, and the THD of grid voltage is less than 3%.

关 键 词：APF FFT 谐波补偿 滤波 

分 类 号：TN713.8[电子电信—电路与系统]