重复控制在链式SVG中的应用

Application of Repetitive Control Technique in Cascaded SVG

作为当前最先进的无功补偿装置,静止无功发生器(Static Var Generator,SVG)在补偿无功的同时,还可以同时实现谐波补偿功能。SVG进行综合补偿时,传统的PI控制很难消除稳态误差,为此,将重复控制技术应用于SVG的指令电流跟踪控制,提出一种包含重复控制器和PI控制器的复合控制器。这种复合控制器兼具PI控制器和重复控制器的优点,具有很好的动态效果及稳态跟踪精度。仿真和实验验证证明了该方法的有效性。

As the most advanced equipment for reactive power compensation, the static vat generator （SVG） can simul- taneously realize the reactive power compensation and the har- monic compensation. It is difficult to eliminate steady-state error by using traditional PI controller when the SVG needs to provide synthetic compensation ability. To solve this problem, the repet- itive control technique is used to realize the tracking control of instruction currents. The repetitive controller and PI controller are used together to form a composite controller. As a result, the high tracking accuracy and the rapid response character are inte- grated in the advanced controller. The results of simulation and practical application prove the validity of the proposed strategy.