Application of Fuzzy Logic Controller in DVR for Enhanced Power Quality in Distribution Systems

The rising demand of sensitive electronic devices and nonlinear loads in current distribution systems has enriched the demand for sound power quality solutions. In the proposed research, a fuzzy logic controller (FLC)-based Dynamic Voltage Restorer (DVR) will be implemented as a method to curb sags, swells, and harmonics. As opposed to conventional PID controllers, FLCs are able to control nonlinearities and unknown uncertainties in a system without specific mathematical modeling. Membership functions and linguistic rules are adopted to carry out real-time compensation of voltage using the DVR. MATLAB/Simulink simulations show that the FLC-based DVR has a faster response, can be more accurate, and has lower total harmonic distortion (THD) against different loads and disturbances. The system also responds well to arbitrary and variative load functions and is, therefore, appropriate in the distribution grid. Optimization of the rule base and hardware feasibility are also discussed within the research, showing the potential of fuzzy logic as one of the soft computing methods for smart adaptive power grid applications that are designed to ensure the improvement of the power quality.