Indian Journal of Science and Technology

Abstract

Renewable energy systems such as Photovoltaic system generate low output, thus, dc/dc converters are widely employed in many renewable energy applications to improve the output voltage. But due to leakage inductance, the conventional step-up converters cannot achieve high step-up conversion with high efficiency. Thus A concept of high step-up conventional converter for photovoltaic system has been explained in this paper. The most important improvement of this step-up converter is that as it is operated with the help of voltage multiplier module, it does not depend on the value of extreme duty ratio. This high step-up converter is designed based on dc-dc boost converter and coupled inductors. This work also proposed the application of Maximum Power Point Tracking (MPPT) techniques to PV system for improvement in output power and overall efficiency. The experimental setup for a high step-up based solar system is worked in Matlab and the results are compared for different types of MPPT techniques which shows that the Fuzzy logic based MPPT controller can meet the load easily and have fewer fluctuations around maximum power point; also this method has well regulated PV output power and has high efficiency when compared to Perturb and Observe and Incremental Conductance methods.
Keywords: Coupled Inductors, High Step-up Converter, Maximum Power Point Tracking (MPPT) Techniques, Photovoltaic (PV) Array, Voltage Multipliers