A Power Control Strategy for Three Phase Converter using Fuzzy Controller

The Paper aims at review of a three-phase DC-AC power converter for Microgrids applications. Three- phase DC-AC power converters suffer from power oscillation and overcurrent problems in case of the unbalanced AC source voltage that can be caused by grid faults/generator fault. To handle these problems we have to properly select and control the positive and negative-sequence currents. In this paper, a new series of control strategies which utilize Fuzzy logic technique is used to estimate the zero-sequence components are proposed to enhance the power control ability under this adverse condition. It is seen that by introducing proper zero-sequence current controls and corresponding circuit configurations, the power converter can enable more flexible control targets, achieving better performances in the delivered power and the load current when suffering from the unbalanced AC voltage. With an appropriate design control scheme by using of MATLAB the simulation result will be obtained.