A High Voltage Gain DC-DC converter with VMC Technique for PV Applications

Abstract

A DC-DC converter is designed to produce a DC output voltage from a DC input. When a required output voltage is higher than input voltage, a boost converter is typically used. Due to its low conduction loss, simple design, and affordability, a conventional boost converter is suitable for step-up applications. However, it is not ideal for achieving high step-up ratios. Operating conventional boost converters at high ratios can result in significant voltage and current stress on the switches. To address this, an interleaving technique in boost converters is introduced, offering higher voltage gains suitable for high-power applications. Traditional DC-DC boost converters face limitations in achieving high voltage gains due to factors such as more stress on power switches, diode reverse recovery problems and the series resistance of inductors and capacitors. This document proposes a novel DC-DC converter that achieves high voltage gains without requiring an extremely high duty cycle. The design uses two inductors with identical inductance levels, charging them in parallel during the switch-on phase and discharging them in series during the switch-off phase, enhancing voltage conversion efficiency. Specifically designed for photovoltaic systems, the proposed converter family offers high-voltage-
gain capabilities. It can function as a multiport converter drawing power from two independent sources or a single source in an interleaved fashion, maintaining continuous input current withlow ripple-ideal for applications like solar energy. By cascading multiple diode-capacitor stages, the design effectively boosts voltage while minimizing stresses on switches, diodes, and capacitors