LC滤波电压源型逆变器闭环控制策略综合对比与设计

Generalized Analysis and Design of Closed-loop Control Strategies for LC-filtered Voltage Source Inverters

从控制器所在坐标系、控制器结构、控制器设计3个方面详细分析和比较了LC滤波电压源型逆变器(VSI)不同闭环控制策略之间的区别与联系,指出了单独采用谐振控制器在无输出电压解耦的情况下能得到较好的控制效果,但在有解耦时会引起系统发散。同时,讨论了单电压环控制与双闭环控制的区别。最后,针对不间断电源带电机负载的应用场合进行了VSI控制器设计。实验结果表明,使用文中的设计方法与结论,能够加快控制器的设计过程,并且得到较满意的控制效果。

In-depth analysis and comparison are made of the difference and relation between different closed-loop control strategies for LC-filtered voltage source inverters （VSI） from the perspective of the controller coordinate system, control loop structure and controller design. And it is pointed out that adoption of a separate resonant controller without output voltage decoupling achieves better control effects, but instability of the system will occur when there is one. Meanwhile, the difference between single-voltageqoop control and dual-closed-loop control is discussed. Finally, a VSI controller for use in uninterrupted power supply with motor load is designed. Experimental results show that, by using the design methods and conclusions under discussion, the process of designing the controller for VSI can be greatly shortened while achieving satisfactory performance.