A Novel Single-Switch High Step-Up DC–DC Converter with Three-Winding Coupled Inductor

Aline V C Pereira,Márcio Rodrigo Santos De Carvalho,Gustavo M Azevedo,Fabrício Bradaschia,Rafael C Neto,Marcelo C Cavalcanti

doi:10.3390/en14196288

Aline V C Pereira, Márcio Rodrigo Santos De Carvalho + Show 4 more

Open Access

https://doi.org/10.3390/en14196288

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Journal: Energies	Publication Date: Oct 2, 2021
Citations: 5	License type: CC BY 4.0

Affiliation: Universidade Federal de Pernambuco

Abstract

This paper introduces a single-switch, high step-up DC–DC converter for photovoltaic applications such as power optimizers and microinverters. The proposed converter employs two voltage multipliers cells with switched capacitor and magnetic coupling techniques to achieve high voltage gain. This feature, along with a passive clamp circuit, reduces the voltage stress across the switch, allowing for the employment of low RDSon MOSFET. This leads to low conduction loss of the switch. The diodes operate with zero-current switching at their turn-off transition, eliminating the reverse recovery losses. Additionally, the switch turns on with zero-current switching, leading to insignificant switching loss associated with its turn-on transition. The operation principle and steady-state analysis are presented and validated through experimental results obtained from a 140 W prototype of the proposed converter.

Highlights

The development of technologies to improve the performance of architectures with distributed maximum power point tacking (MPPT) are fundamental to raise grid-utilitydistributed generation systems from photovoltaic (PV) solar sources in large urban centers, mainly for residential applications
Architectures with PV module-integrated converters (MICs) and parallel connected power optimizers have maximum power point tracking (MPPT) per PV module capability, these configurations are different: architectures with MICs, shown in Figure 1a, convert the PV module DC voltage directly to AC, since MICs are composed of two power conversion stages (DC–DC followed by DC–AC); on the other hand, in architectures with parallel-connected power optimizers, shown in Figure 1b, the output DC voltage of the power optimizer is converted into AC by a central inverter [1,2]
Due to the low voltage and efficiency of PV modules, high-gain DC–DC converters are necessary in MICs and power optimizers to boost the DC bus voltage of the DC–AC converter above the minimum value necessary while tracking the maximum power of PV modules

Summary

Introduction

The development of technologies to improve the performance of architectures with distributed maximum power point tacking (MPPT) are fundamental to raise grid-utilitydistributed generation systems from photovoltaic (PV) solar sources in large urban centers, mainly for residential applications. Architectures with PV module-integrated converters (MICs) and parallel connected power optimizers have maximum power point tracking (MPPT) per PV module capability, these configurations are different: architectures with MICs, shown, convert the PV module DC voltage directly to AC, since MICs are composed of two power conversion stages (DC–DC followed by DC–AC); on the other hand, in architectures with parallel-connected power optimizers, shown, the output DC voltage of the power optimizer is converted into AC by a central inverter [1,2]. Due to the low voltage and efficiency of PV modules, high-gain DC–DC converters are necessary in MICs and power optimizers to boost the DC bus voltage of the DC–AC converter above the minimum value necessary while tracking the maximum power of PV modules. The conventional boost converter would not be adequate for high step-up voltage gain applications [2,3,4,5]

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Results

Conclusion