Power maximised and anti-saturation power conditioning circuit for current transformer harvester on overhead lines

Zhongnan Qian, Jiande Wu, Xiangning He, Zhengyu Lin

Research output: Contribution to journalArticle

Abstract

The current transformer (CT) harvester is an effective and efficient solution due to its higher reliability and power density compared to other techniques. However, the current of overhead conductor fluctuates from tens of to thousands of amperes, which brings two challenges for the CT harvester design. First, the startup current, above which the harvester can independently power the monitoring devices, should be as low as possible, so that the battery capacity can be reduced; secondly, the magnetic core should be ensured unsaturated in high current condition. This paper proposes a power conditioning circuit with comprehensive control to maximize the output power and prevent the core from saturation. A prototype that can deliver 22.5 W power with 200 A is designed, and a control strategy based on the finite-state machine is implemented. Experimental results show that the startup current for 2 W load is about 30 A, and the core power density at 60 A is 45.96 mW/cm3, both of which are markedly improved compared to the reported results of the same condition.
Original languageEnglish
Pages (from-to)2271 – 2278
Number of pages8
JournalIET Power Electronics
Volume11
Issue number14
Early online date4 Sep 2018
DOIs
Publication statusE-pub ahead of print - 4 Sep 2018

Fingerprint

Overhead lines
Electric instrument transformers
Harvesters
Networks (circuits)
Magnetic cores
Finite automata
Monitoring

Bibliographical note

This paper is a postprint of a paper submitted to and accepted for publication in IET Power Electronics and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library

Cite this

Qian, Zhongnan ; Wu, Jiande ; He, Xiangning ; Lin, Zhengyu. / Power maximised and anti-saturation power conditioning circuit for current transformer harvester on overhead lines. In: IET Power Electronics. 2018 ; Vol. 11, No. 14. pp. 2271 – 2278.
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abstract = "The current transformer (CT) harvester is an effective and efficient solution due to its higher reliability and power density compared to other techniques. However, the current of overhead conductor fluctuates from tens of to thousands of amperes, which brings two challenges for the CT harvester design. First, the startup current, above which the harvester can independently power the monitoring devices, should be as low as possible, so that the battery capacity can be reduced; secondly, the magnetic core should be ensured unsaturated in high current condition. This paper proposes a power conditioning circuit with comprehensive control to maximize the output power and prevent the core from saturation. A prototype that can deliver 22.5 W power with 200 A is designed, and a control strategy based on the finite-state machine is implemented. Experimental results show that the startup current for 2 W load is about 30 A, and the core power density at 60 A is 45.96 mW/cm3, both of which are markedly improved compared to the reported results of the same condition.",
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Power maximised and anti-saturation power conditioning circuit for current transformer harvester on overhead lines. / Qian, Zhongnan; Wu, Jiande; He, Xiangning; Lin, Zhengyu.

In: IET Power Electronics, Vol. 11, No. 14, 04.09.2018, p. 2271 – 2278.

Research output: Contribution to journalArticle

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