Abstrakt

Reduction of THD Level by Selective Harmonics Filter for Microgrid Using Fuzzy Logic Techniques

Dhana Sekaran.V , Preetha Roselyn.J

This paper states that the microgrids supplied by renewable energy sources (RES) are increasingly studied due to their insignificant environmental impact, concerning the classical power plants. The connection of small generation units in low voltage networks tends to be a more reliable solution. A micro grid can be defined as a lowvoltage network with its loads and several small modular generation systems connected , both power and sometimes heat (combined heat and power – CHP) to local loads. In this project the DC-DC converter is controlled by means of a closed loop proportional-integral-derivative (PID) and fuzzy logic controllers. Fuzzy controllers are nonlinear, therefore it is more difficult to set the controller gains compared to PID controllers. The idea is to start with a tuning of, conventional PID controller, replace it with an equivalent linear fuzzy controller, make the fuzzy controller nonlinear.The inverter is totally controlled to perform as multi-function device by incorporating active power filter functionality..