差拍控制在有源电力滤波器中的应用

有源滤波器因可以实现谐波、无功、不平衡分量补偿等多种功能 ,所以已成为谐波抑制的主要技术。而且随着脉宽调制技术和微机技术的不断发展 ,使得基于微机的数字脉宽调制方法在有源滤波器中的应用成为可能。无差拍控制就是其中一种在预测控制基础上发展起来的全数字化脉宽调制方法。该方法的优点是能够预测谐波电流的变化趋势并跟踪补偿 ,缺点是控制算法复杂 ,对预测模型依赖性较大 ,使其在具体实现过程中存在困难。针对这一不足 ,提出了一种改进的、易于实现的差拍控制方法 ,并结合定脉宽调制技术 ,以单相并联型有源滤波器为对象进行

Application of beat control in shunt active power filter

The active power filter (APF) is considered as an effective approach to solve the problem of harmonic compensation as well as the reactive power and unbalanced compensation. Due to the development of pulse width modulation (PWM) and microcomputer technology, digital PWM in APF becomes possible. Among various PWM control methods, deadbeat control is a fully digital PWM control based on the prediction control theory. Though it has the advantage of precise harmonic prediction, its complex control algorithm and strongly relying on prediction model limit its actual application. Therefore an improved method--beat control which is easier to realize is proposed. The simulation result on a shunt single phase APF shows that it has the compensation effects similar to that of deadbeat control.