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

Abstract

This paper presents a novel interleaved converter (NIC) with extra-high voltage gain to process the power of low-voltage renewable-energy generators such as photovoltaic (PV) panel, wind turbine, and fuel cells. The NIC can boost a low input voltage to a much higher voltage level to inject renewable energy to DC bus for grid applications. Since the NIC has two circuit branches in parallel at frond end to share input current, it is suitable for high power applications. In addition, the NIC is controlled in an interleaving pattern, which has the advantages that the NIC has lower input current ripple, and the frequency of the ripple is twice the switching frequency. Two coupled inductors and two switched capacitors are incorporated to achieve a much higher voltage gain than conventional high step-up converters. The proposed NIC has intrinsic features such as leakage energy totally recycling and low voltage stress on power semiconductor. Thorough theoretical analysis and key parameter design are presented in this paper. A prototype is built for practical measurements to validate the proposed NIC.

Switched-Capacitor Boost Converter for Low Power Energy Harvesting Applications

“…Also, the TEG itself has a significant internal resistance (in the range of Ohms). These facts stimulated the researchers in the field to investigate different inverter structures with high voltage gains [9][10][11].…”

Magnetic Material Assessment of a Novel Ultra-High Step-Up Converter with Single Semiconductor Switch and Galvanic Isolation for Fuel-Cell Power System

“…A high step-up converter developed for photovoltaic (PV) module, wind turbine, or fuel cells is able to boost up a low voltage to a much higher level [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ], thus, which can accomplish power injecting into a DCbus [ 11 , 12 ]. Magnetic inductor is a main component that is much more important than any other devices in a high step-up converter.…”

Interleaved High Step-Up DC-DC Converter Based on Voltage Multiplier Cell and Voltage-Stacking Techniques for Renewable Energy Applications

“…The high step-up converters without a coupled inductor or transformer are proposed in [13,14]. Several kinds of interleaved high step-up converters with voltage multiplier cells have been proposed in [15][16][17][18][19]. The interleaved converters with three-winding coupled inductors are proposed to achieve high voltage conversion ratio and low input current ripple [20][21][22].…”

“…In the literature, a lot of converter topologies have been proposed to obtain high step-up voltage gain [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. For coupled inductor-based converters [6][7][8][9][10], the high voltage gain can be achieved by adjusting the turns ratio of the coupled inductor and duty ratio.…”