349 / 2022-03-15 16:57:50

Energy harvesting method of insulated ground wire based on self-excited magnetically controlled reactor

self-excited magnetically controlled reactor,insulated ground wire,overhead transmission lines,field-circuit coupled transient simulation

Harvesting energy from the insulated shield wire with tuning is expected to be a possible solution to the problem of high power supply for online monitoring devices on high-voltage overhead transmission lines.  However, at present, the tuning reactor used for energy extraction from insulated ground wire has small inductance adjustment range and slow response speed. In order to realize the load adaptability of self-powered supply and maximum output power of the energy harvesting system, this paper studies a magnetic control reactor with self-excited function to adjust the reactor inductance smoothly responding to the fluctuation of equivalent parameters of energy harvesting circuit.


Firstly, the topology and equivalent model of power tapping from the ground wire with tuning are established based on the multi-conductor system model and the Thevenin's theorem. Secondly, taking an energy harvesting section of 220 kV high voltage overhead transmission line as an example, under different spans and conductor arrangement modes, the variation range of the equivalent parameters of energy-harvesting circuit is calculated, and the required adjustment range of the inductance value of tuning reactor is determined. Thirdly, the parameter design is carried out to determine the turns of the working coil and the control coil of the reactor, and the size of the iron core. Finally, a field-circuit coupled transient simulation is carried out by ANSYS Maxwell software, and the maximum output power and load voltage under different conditions are obtained.


The simulation results show that the proposed self-excited magnetically controlled reactor can harvest power from the insulated ground wire as much as possible and limit the voltage within allowable value at the same time, under different spans and conductor arrangement modes of high-voltage overhead transmission lines.


In this paper, the tuned reactor used to harvest energy can smoothly adjust the inductance value through the control system when the parameters fluctuate, and effectively limit the output voltage to the allowable range while ensuring the acquisition of the target power. This means it has certain universality for energy harvesting circuit and can provide a choice of suppling power for a variety of on-line monitoring systems and Unmanned Aerial Vehicles on high-voltage overhead transmission lines.