Optimisation design of real‐time wireless power supply system overhead high‐voltage power line

Abstract

Efficient and reliable power supply has been considered as the fundamentality of applying monitoring equipment overhead high-voltage power line (HVPL). Several kinds of energy harvesting devices are investigated and compared. A new power supply scheme, which integrates the online energy harvesting device and the wireless power transfer (WPT) system, is presented. Optimisation design of online energy harvesting device is analysed emphatically by taking both HVPL insulation distance and wireless power supply efficiency into account. For further increasing the harvested energy from power lines, this study discusses the design of specific device structure and the accurate calculation of maximum output power. It is found that essential parameters and exciting current angle contribute to more extracting energy. Meanwhile, in order to expand the transmitting distance with high efficiency, the WPT system with double relay coils is selected. The charging threshold voltage of the load can be further optimised under different transmitting distances by adopting an AC-DC voltage-doubling rectifier circuit. Simulation and experimental studies show that when the transmitting distance is >1 m, the monitoring equipment can also be charged in a reliable way, which also verifies the correctness and feasibility of the system.

Comparative design methods of wireless power system for sensors with extended range using Class E inverter at a certain frequency

“…It can be seen from the above table that the power transmitting distance can be increased by improving the system frequency and expanding the coil size. However, when the coil size is similar, compared with the frequency tracking method in [17] and the resonant compensation method in [19], the design method proposed in this paper could make the power transmitting distance reach 2000 mm under the frequency of 330 kHz, which could also maintain >66% of the system efficiency.…”

“…The applications of the WPT in mid-range (>1 m) have attracted a lot of attention, especially in sensors such as wireless charging for on-line monitoring equipment on the overhead highvoltage transmission line [19]. By considering the actual working temperature and the environment, the Class E inverter has to work at soft-switching to guarantee the high efficiency of the WPT system.…”

Energy Harvesting Techniques for Monitoring Devices in Smart Grid Application

“…Wei Wang et al [14] propose a technique in which harvester is not physically connected to load. The harvesting source used here is magnetic field around a current carrying conductor.…”

Using Overlapped Resonators in Wireless Power Transfer for Uniform Electromagnetic Field and Removing Blank Spots in Free Moving Applications

“…Different topologies in array structures have been able to cover a large area, and various methods have been proposed for power transmission uniformity and the elimination of blank spots [19,20]. The most important ideas in the literature concern proposing models for the electrical excitement of external coils via a power supply [21]. Although these methods are effective in eliminating blank spots, the uniformity of the power transmission still remains a major challenge.…”