基于反馈解耦控制和畸变矫正的单相无功补偿策略

The Single-phase Reactive Power Compensation Strategy Based on Feedback Decoupling Control and Distortion Correction

分析了单相逆变系统并建立了单相逆变器在d-q轴下的有功无功模型。该有功无功模型和三相系统一样,可以借用反馈解耦控制进行有功无功的控制。为了实现单相d-q变换,论文给出了一种滑动窗口滤波的方法。但是滑动窗口使得有功和无功不能完全解耦,从而反馈解耦控制系统的动态效果较差。为了克服这些缺点,文中提出了一种畸变矫正的方法,这种方法不仅改善了控制系统的动态特性,还消除了电流畸变,最后仿真验证了该方法的有效性。

The characteristic of single-phase converter system is analyzed and the active power and reactive power model in d-q axis are established, which is the same as the three-phase system in d-q axis employing decoupling feedback control for reactive compensation and active power control. A new orthogonal decomposition method with sliding window filter （SWF） is presented to realize d-q transformation in single-phase system. Whereas, as a result of SWF, the coupling between active power and reactive power could not be eliminated completely, which leads to poor dynamic process in control system and significant distortion in compensation current. A distortion correction control strategy is presented for overcoming these shortages, which not only could improve the control system dynamic characteristics, but also eliminate compensation current＇s distortion. At last, simulations with different control strategies demonstrate the validity and superiority of proposed control strategy.