Abstract
Overhead high voltage power line (HVPL) online monitoring equipment is playing an increasingly important role in smart grids, but the power supply is an obstacle to such systems’ stable and safe operation, so in this work a hybrid wireless power supply system, integrated with inductive energy harvesting and wireless power transmitting, is proposed. The energy harvesting device extracts energy from the HVPL and transfers that from the power line to monitoring equipment on transmission towers by transmitting and receiving coils, which are in a magnetically coupled resonant configuration. In this paper, the optimization design of online energy harvesting devices is analyzed emphatically by taking both HVPL insulation distance and wireless power supply efficiency into account. It is found that essential parameters contributing to more extracted energy include large core inner radius, core radial thickness, core height and small core gap within the threshold constraints. In addition, there is an optimal secondary coil turn that can maximize extracted energy when other parameters remain fixed. A simple and flexible control strategy is then introduced to limit power fluctuations caused by current variations. The optimization methods are finally verified experimentally.
Highlights
Industrial electricity demand has been drastically increasing with the spread and intensification of industrial development
In order to avoid possible paralysis of the power grid, real-time online monitoring is applied to supervise the potential dangers to high voltage power line (HVPL) with the help of real-time status monitoring equipment
This paper mainly focuses on 110 kV high voltage lines and aims to develop an energy harvesting device by electromagnetic induction and wireless power transmission technology
Summary
Industrial electricity demand has been drastically increasing with the spread and intensification of industrial development. Damage to HVPLs caused by strong winds, extreme climate, icing, lightning, contamination, tower tilting, etc. In order to avoid possible paralysis of the power grid, real-time online monitoring is applied to supervise the potential dangers to HVPLs with the help of real-time status monitoring equipment. Domestic and foreign scholars have proposed several methods for HVPL fault diagnosis and online monitoring [3], but the problem of an convenient and efficient power supply for monitoring equipment remains unresolved. Previous studies [4,5,6,7] have introduced several commonly-used power supply methods: (1) on the basis of the capacitor dividing principle, energy obtained from electric fields around the power line can be used to power the monitoring equipment;
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