A Photovoltaic Power System Using a High Step-up Converter for DC Load Applications

Abstract

This paper presents a power system using a high step-up converter for dc load applications. The high step-up converter adopts a boost converter with interleaved mode and a coupled inductor to raise its powering ability and increase its step-up voltage ratio, respectively. In order to increase conversion efficiency, an active clamp circuit is introduced into the proposed one to provide soft-switching features to reduce switching losses. Moreover, switches in the converter and active clamp circuit are integrated with a synchronous switching technique to reduce circuit complexity and component counts, resulting in a lower cost and smaller volume. A perturb and observe method is adopted to extract the maximum power from photovoltaic (PV) arrays. Furthermore, a microchip associated with PWM IC is used to implement maximum power point tracking operation, voltage regulation and power management. Finally, a prototype PV power system with 400 V/6 A has been implemented for verifying the feasibility of the proposed PV power system. It is shown to be suitable for PV energy conversion applications when the duty ratios of switches in the dc/dc converter are less than 0.5.

A Multifunctional Isolated and Non-Isolated Dual Mode Converter for Renewable Energy Conversion Applications

“…Currently, there are some converter topologies for solar power and other renewable energy applications [6][7][8][9]. Generally, the grid-connected systems use non-isolated converters in most conditions.…”

Novel Interleaved Converter with Extra-High Voltage Gain to Process Low-Voltage Renewable-Energy Generation

“…Single-stage topology incorporates coupled inductors and/or switched capacitors to complete high voltage gain. Even though its input voltage is boosted, a large magnitude of input current ripple occurs, limiting the converter power rating significantly [5][6][7][8]. The interleaved converter has the ability of suppressing input current ripple by means of adding a parallel current path, which is a better choice for high power applications [9][10][11].…”

Modeling and Control of Micro-grid Powered by Solar and Wind Energies

“…Indeed, they were mixed in an integrated system that was successfully tested.The output voltage and the PV power delivered to the converter are maintained to 450V and 650W, respectively. Sheng-Yu Tseng et al [19] developed a power system using a high step-up converter for DC load applications. The high step-up converter adopts a boost converter [20].…”