CGA-FOPID BASED UPQC FOR MITIGATING HARMONICS AND COMPENSATE LOAD DEMAND IN GRID LINKED HYBRID RENEWABLE ENERGY SOURCES

Abstract

Power Quality (PQ) explore the issues resulting from current and voltage deviations. Due to an extraordinary rise in nonlinear loads, such as power electronic-based loads, the issues with power quality in distribution systems have become severe. Non-sinusoidal current is drawn from the electric grid by the nonlinear loads. These non-sinusoidal currents contain harmonics and reactive power that lower the system’s overall PQ. Unified Power Quality Conditioner (UPQC) was emerged as a promising compensator to provide a solution for all PQ issues. UPQC generally had two Voltage Source Converters (VSC), one was Shunt, and the second was a Series that act as a current controller and voltage controller, respectively. Yet the controlling strategy of this compensator was still complex to design. Here, an optimization based Fractional Order Proportional Integral Derivative (FOPID) was developed to manage UPQC for improving PQ in a hybrid Renewable Energy System (RES). The optimal problem of the FOPID controller was solved through the use of a novel optimization approach. The pulse signal of UPQC was done using the optimal controller, which analyzes the error value of reference voltage and actual load voltage to generate pulses. The proposed optimal controller based UPQC performance was validated under various conditions such as interruption, swell, harmonics, and sag. The optimal controller offered THD value in sag, swell, and interruption period at current have 10.19%, 9.77%, and 10.09%, at voltage have 0.09%, 0.07%, and 0.30%. Moreover, the issues mitigation performance was compared to another present approaches. The validated outcome demonstrates the proposed model provides a well mitigation performance in all PQ issues conditions, so it was well fit for real-time implementation.