一种等效奇次谐波谐振器的单相DVR控制方法

An Equivalent Odd Harmonics Resonant Controller for Single-phase DVRs

提出了一种应用于单相动态电压恢复器(DVR)的数字控制方法。采用单相构造三相的方法可以得到需要的旋转坐标量。使用旋转坐标系下的重复控制模块,该模块可以等效为静止坐标下的一组奇次谐波谐振器,从而可以补偿单相系统中的奇数次谐波。加入前馈和PR控制器可以增加基波频率处的增益,加快动态响应。文中控制系统无电流环,结构被简化。仿真和实验结果表明,系统能有效抑制谐波,对电压跌落和负载扰动响应迅速。

Digital controllers apphed in the Dynamic Voltage Restorer （DVR.） are very important and always determines the DVR＇ s performance. A kind of digital controller was proposed for single-phase DVRs. The synchronous-flame parameters can be obtained by transfomaing the single-phase structure into a three-phase one. Then the synchronous-frame repetitive controller, which can also be regarded as a series of odd harmonics resonant controller operating in stationary frame, was used to compensate odd harmonics in single-phase systems. Moreover, the feedforward and the proportional-resonant parts would provide the system with higher gain at the fundamental frequency and faster dynamic response. Apart from that, the controller was simpler than others without the current loop. The simulation and experiment results prove that the controller proposed has a good performance in suppressing the grid harmonics and fast dynamic response towards grid sags and load disturbances.