Power Quality Enhancement in Micro Grids Using Fuzzy Hysteresis Current Controller

Abstract

Electricity consumption is steadily rising, fossil fuels are depleting, and conventional plants are taking longer to erect, increasing the use of onsite renewable energy. Due to dynamic changes in environmental factors and customer load, renewable energy generation is experiencing reliability and quality issues. All of these issues are being addressed by developing integrated renewable energy cluster microgrids in urban communities worldwide. However, a microgrid's effectiveness in generating quality power depends on the power electronic converters it uses. Thus, this paper proposes the "Fuzzy Hysteresis Current Controller (FHCC)-based Inverter" for improving the power quality in renewable energy integrated cluster microgrids that are operated either in grid-connected or autonomous mode. Here, the inverter is controlled through a fuzzy logic-based hysteresis current control loop, achieving superior performance. System modelling and simulations are done using MATLAB/Simulink®. The performance analysis of the proposed and conventional inverter configurations is done by computing various power quality indices, namely voltage characteristics (swell, sag, and imbalance), frequency characteristics (deviations), and total harmonic distortion. According to IEEE/IEC/EN global standards for renewable energy integrated cluster microgrids, the proposed FHCC-based inverter achieves a better power quality than the traditional ST-PWM-based inverter.