【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。更多还原

【Abstract】 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.更多还原