Amineh  Zeinoddini, Ebrahim  Afjei, 
    Feeding Unbalanced Loads by Controlling Four-Leg Inverters Using Resonant Controllers,
    Journal of Engineering and Applied Sciences,
    Volume 11,Issue 3,
    2016,
    Pages 598-609,
    ISSN 1816-949x,
    jeasci.2016.598.609,
    (https://makhillpublications.co/view-article.php?doi=jeasci.2016.598.609)
    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.
    Keywords: Four-leg inverters;multilevel inverters;resonant controllers;unbalanced loads;validate