状态反馈与延迟补偿相结合的电流型有源滤波器控制方法  

A NOVEL CONTROL SCHEME FOR THREE-PHASE CURRENT-SOURCE ACTIVE POWER FILTER BASED ON STATE FEEDBACK COMBINED WITH DELAY COMPENSATION

作　　者：侯勇[1] 江红胜[2] 朱晓光[2] 

机构地区：[1]东北电力学院电力工程系,吉林省吉林市132012 [2]清华大学电机工程与应用电子技术系,北京市海淀区100084

出　　处：《电网技术》2005年第8期40-44,共5页Power System Technology

基　　金：国家自然科学基金资助项目(50137020)~~

摘　　要：电流型有源滤波器比电压型有源滤波器有更强的电流控制能力和更高的可靠性。电流型有源滤波器主要由电流源脉宽调制(PWM)逆变器和LC型无源滤波器组成。LC型无源滤波器能滤除逆变器开关频率附近的谐波分量,但会引起系统振荡;由于采样和计算的延迟,逆变器发出的补偿电流总滞后于负载电流,使得有源滤波器的补偿性能较差。为解决这些问题,文中提出了状态反馈和延迟补偿相结合的控制方法,用状态反馈提高系统阻尼,用延迟补偿减小逆变器补偿电流的滞后时间。在基于TMS320C32型数字信号处理器(DSP)构建的有源滤波器实验装置上进行的实验表明该方法有较好的稳态滤波效果和暂态过渡性能。Current-source active power filter, consisting of current-source pulse width modulation (PWM) inverter and LC passive filter, possesses better current controlling ability and higher reliability. LC passive filter can filtrate the harmonic components whose frequencies near the switching frequency of the inverter, but power system oscillation may be caused. Because of the delay from the sampling and calculation, the output compensation currents of the inverter always lag behind the load current, and it makes the compensation performance of active power filter inferior. To solve these problems, a control method, in which the state feedback control is combined with delay compensation control, is proposed, the state feedback control enhances the system damping and the delay compensation control reduces the time delay of inverter's compensation current. The results of the tests, performed by the experimental active filtration device constructed on the basis of digital signal processor TMS320C32, show that the proposed control method possesses good transient performance and can provide better filtration effect.

关 键 词：电力系统 无功功率补偿 状态反馈 延迟补偿 电流型有源滤波器 控制方法 逆变器 

分 类 号：TM714.3[电气工程—电力系统及自动化] TN713.8[电子电信—电路与系统]