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

© The Institution of Engineering and Technology
Received 10/01/2018, Accepted 28/08/2018, Revised 27/07/2018, Published 03/09/2018

The current transformer (CT) harvester is effective and efficient for energy harvesting on overhead lines 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; second, the magnetic core should be ensured unsaturated in high current condition. This study proposes a power conditioning circuit with comprehensive control to maximise 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.

Inspec keywords: finite state machines; power overhead lines; energy harvesting; magnetic cores; current transformers

Other keywords: current 60.0 A; magnetic core; output power; core power density; finite-state machine; higher reliability; energy harvesting; current 200.0 A; overhead conductor; current transformer harvester; power 2.0 W; overhead lines; monitoring devices; CT harvester design; high current condition; anti-saturation power conditioning circuit

Subjects: Transformers and reactors; Overhead power lines; Energy harvesting; Control of electric power systems; Automata theory; Energy harvesting

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