Fuzzy Controller Based 3-phase Inverter for Micro Grid with Induction Motor Drive Application

In this paper author discussed PI and fuzzy controllers with the three phase inverter concept and this converter connected to induction motor drive as load. This presents a unified control strategy that enables both islanded and grid-tied operations of three-phase inverter in distributed generation, with no need for switching between two corresponding controllers or critical islanding detection. Intentional islanding describes the condition in which a microgrid or a portion of the power grid, which consists of a load and a distributed generation (DG) system, is isolated from the remainder of the utility system. When the microgrid is cut off from the main grid, each DG inverter system must detect this islanding situation and must switch to a voltage control mode. The control strategy composes of an inner inductor current loop, and a novel voltage loop in the synchronous reference frame. Induction motor is one of the load in grid. The inverter is regulated as a current source just by the inner inductor current loop in grid-tied operation, and the voltage controller is automatically activated to regulate the load voltage upon the occurrence of islanding. This paper mainly depends on PI and fuzzy controller by using fuzzy controller to improve the power quality compare to PI controller. The proposed converter tested with Matlab/simulink software.