A fast and cost-effective short circuit protection scheme for low-power converters for small-scale photovoltaic application
ISSN: 0305-6120
Article publication date: 21 January 2022
Issue publication date: 16 June 2022
Abstract
Purpose
This paper aims to propose an integrated protection scheme for converters of a low-power, low-cost photovoltaic system. Power electronic converters use a variety of methods to limit overload and fault current. The use of insulated and non-insulated sensors along with additional circuits to detect and limit fault current can cause current to be limited or completely cut off before damage to semiconductor devices. In addition, fuses that have slower performance are used as backup for any type of protection.
Design/methodology/approach
First, all the candidate points for protection are investigated. In this paper, after examining the performance of glass fuses as linear resistors, they are used as a current feedback element. A simple, isolated and reliable circuit for fault detection at various points of the system has been proposed that can be implemented and operated in single shot or auto-reclose operating mode.
Findings
The experimental results of this circuit on a dc/dc converter and an H-bridge inverter show that it can cut off all instantaneous short circuit errors in less than 50 µs and prevent damage to the semiconductor switch.
Originality/value
In low-cost and low-power converters, it is usually not cost-effective to use complex and expensive devices. For this reason, these converters are more vulnerable to faults. On the other hand, in complex systems such as photovoltaics, several converters are used simultaneously in different parts, and the occurrence of a fault in each of them causes the whole system to fail.
Keywords
Acknowledgements
This research has been supported by Arak University under contract number 94/882.
Citation
Ebadi, M., Abbasi, N. and Maghsoudi, H. (2022), "A fast and cost-effective short circuit protection scheme for low-power converters for small-scale photovoltaic application", Circuit World, Vol. 48 No. 3, pp. 366-376. https://doi.org/10.1108/CW-11-2021-0281
Publisher
:Emerald Publishing Limited
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