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Asymmetrical DC-DC Converter with Fault Tolerant Operation Capability for Distributed Generation

Zhengzhao He1, Wenping Cao1, Zhengyu Lin1 and Yihua Hu2

1. School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, United Kingdom

2. School of Electrical Engineering & Electronics, University of Liverpool, Liverpool L69 3BX, United Kingdom


Abstract: As the costs of manufacturing photovoltaic (PV) panels continue to decrease, the use of PV-based solar energy systems is seen in rise across the globe. This paper proposes an asymmetrical DC-DC converter for standalone solar energy systems. The converter is developed to control modularized PV panels with a combination of soft-switching, flyback-forward, high-step-up voltage ratio, and fault tolerant operation features. This topology can achieve maximum power point tracking (MPPT) control while delivering a high voltage gain and an efficiency of 92-95% over a wide range of outputs by phase shift control. The entire system is firstly simulated and refined using the PSIM software and tested experimentally on a 300 W prototype. The key feature is its fault tolerant operation capability without the use of extra fault diagnosis circuitry. The proposed technique can be applied to grid-tied solar energy systems and fuel-cell DC systems.

Key words: Asymmetrical converter, fault tolerance, DC-DC converter, MPPT, photovoltaic power.
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