三相四开关APF控制策略研究

Study on Control of Three-phase Four-switch Active Power Filter

针对三相四开关APF分析其跟踪误差电流及其变化率在复平面上的夹角关系，提出了一种控制方法。该算法与基于空间电压矢量的滞环控制相比减少了扇区判断的复杂性；同时与切换控制相比也省去了复杂的定理证明。在满足稳定性理论的前提下，使得跟踪误差电流及其变化率这两个矢量的和最小以保证电流误差降到最小；对于直流侧两电容电压的控制采用比例积分控制器以达到设定值，仿真验证了控制算法的有效性。

For the three-phase four-switch APF, based on the analysis of the angle relation between the tracking error current and its changing rate in the complex plane, a control method is proposed. Compared with the hysteresis control method based on space voltage vector, the algorithm reduces the complexity of the sector judgment; at the same time, compared with the switching control the algorithm also eliminates the complex theorem proof. Under the premise of meeting the stability theory ,we made the two vector sum of tracking error current and its changing rate approach minimum in order to reducing the error current to minimum. For the control of capacitor voltage of the DC side, two proportional-integral controllers are adopted to ensure capacitor voltage reach the set value, and the simulation shows the effectiveness of the control algorithm.