Efficiency analysis of grid tied PV system with KY integrated SEPIC converter

Abstract

Today's power generation relies heavily on renewable energy, which also contributes to distributed generation, microgrids and smart cities. PV system is a rapidly developing source of renewable energy and acts as stand-alone or grid-connected systems. The utilization of PV energy faces a drastic increase due to the high efficiency of solar cells and enhancements in the design of PV panels. It demands high gain converters for major applications but existing converters generate pulsating outputs leading to output voltage with ripples. In this view, researchers are constantly focusing on converters with increased efficiency and gain generating minimized ripples in resulting current and voltage. Considering these dilemmas, an efficient PV system with KY integrated SEPIC converter is introduced in this article. The KY converter provides improved voltage conversion ratio as well as minimizes the voltage stress while the SEPIC converter offers added step up gain. The proposed converter is regulated by a GWO tuned PI controller for solving the optimization issues. It prevents the local optimum and is robust, simple with the application to complicated optimization tasks. A grid connected 1φ VSI is adopted for ensuring smooth operation with the aid of PWM generator. The simulations are carried out in MATLAB simulation software to prove the efficacy of the introduced approach. The obtained outputs reveal that this developed system has minimal THD value of 1.6% and hence it has higher efficiency which is marked as 97%.