Voltage Control of Single Phase Islanded Microgrid by Fuzzy Logic Controller for Different Loads

For mitigating heavy pressure on existing power system, distributed generation based microgrid system could be both technically and economically alternative. Voltage fluctuations is one of the main problems in islanded microgrid system. So, THD level should be minimized and be within the range specified by the IEEE standard. For achieving more smooth voltage, a fuzzy logic controller has been used and then compared with other established conventional controllers such as PID, P+Resonant. But with the improvement in THD level of voltages; rise time, peak time, overshoot and settling time have been degraded but in this case it is not harmful for the system. Also by using four different loads an analysis has been done both for the proposed and established controllers. The fuzzy logic controller shows the improved THD level 4.76%, 1.397%, 2.13% and 0.09% for harmonic, nonlinear, asynchronous and unknown load.