The Controller Improves Voltage Quality In Microgrids

The inverters in the microgrid are connected in parallel to improve efficiency. When the Microgrid is operating in standalone mode, the inverters must be controlled to share their power to stabilize the frequency and voltage. The droop control method is one of the most popular power-sharing methods today, some studies have presented traditional and improved droop control methods. However, the purpose of the studies is power-sharing for the inverters that no purpose of reducing the voltage and frequency deviation to improve power quality. This paper presents a voltage and frequency adjustment method based on fuzzy logic to minimize voltage and frequency deviation to improve power quality in microgrids. This controller includes a Droop controller combined with fuzzy logic, the fuzzy logic block will control to change in the slope of the Droop characteristic curve when the load changes. The purpose of the proposed method is to improve the accuracy of power-sharing for inverters and at the same time minimize voltage and frequency deviations in microgrids. Simulation results will prove the effectiveness of the proposed method.