Authors : Amineh Zeinoddini and Ebrahim Afjei
Abstract: In recent years the number of distributed generators which are connected to a network or directly feed local loads is growing. Most of these generators need power inverters for their power transmission. On the other hand, in a power system most of the times, the loads are dynamic and change over time or even in some cases, they might become unbalanced. In this study, we have chosen a switching method presented for four-leg multilevel inverters. The method is based on the switching of two-level inverters which has a simple structure and generality for applying to any topology with any number of levels. Then, a technique for controlling inverters connected to unbalanced loads is presented based on resonant controllers. The presented method benefits from a very simple structure and can be implemented in a synchronous reference frame. At the end, a number of simulations are performed in MATLAB in order to validate the effectiveness of the proposed method and the results are presented.
Amineh Zeinoddini and Ebrahim Afjei, 2016. Feeding Unbalanced Loads by Controlling Four-Leg Inverters Using Resonant Controllers. Journal of Engineering and Applied Sciences, 11: 598-609.