Analysis of the performance of 3 phase system by using D-Q transformation and fuzzy hysteresis controller

The interconnection of the Distributed Generators (DGs) with the utility grid through power electronic converters is growing rapidly, enabling reaching high percentage system stability. The ultimate aim is to provide a reliable control system for integrating small renewable power generating units with main grid. Three phase PWM voltage-source inverters (VSI) are used for interconnecting the utility grid with DG sources where solar and wind were used as DGs. In this paper, fuzzy with constant switching hysteresis controller has been proposed and the performance of the three phase system is analysed by using the proposed controller at the grid-connected VSC. The performance analysis is done in terms of real power and reactive power. Hence in this paper, the real and the reactive powers are controlled thereby achieving unity power factor ensuring the grid stability. The entire study is done in MATLAB/ SIMULINK software and results obtained are then compared with the performance of the system using PI controlled d-q transformation method.