基于虚拟阻抗匹配的架空输电线路地线感应取能

doi:10.19595/j.cnki.1000-6753.tces.242089

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Abstract Under the background of building a new power system, the number of online monitoring devices on transmission lines and towers has increased significantly. However, due to the particularity of the equipment installation location and the complexity of the environment, providing a stable and reliable power supply is challenging. Ground wire current transformer (CT) induction energy extraction of overhead transmission lines is an ideal power supply method for transmission lines and tower online monitoring equipment.
Because of the uncertainty of air gap width in installing the magnetic core opening and closing structure of the ground-wire energy acquisition device, issues such as CT’s parameter fluctuation, constant capacitive element’s incomplete compensation, and output power reduction exist. This paper proposes an induction energy acquisition method based on virtual impedance matching. Firstly, based on the four-quadrant operation characteristics of the voltage source PWM rectifier (VSR), the equivalent circuit model of the energy extraction device is constructed. The relationship between electrical parameters and the output power of CT is analyzed, and the factors affecting the change of ground current are discussed. Then, a control strategy is proposed by indirectly fixing the d-axis current and changing the q-axis through phase shift control to optimize the working state of the energy harvesting device. Thus, it is in a resonant state and achieves maximum power output. In view of the complex problems faced by the traditional 180° open core structure in the winding and installation of the CT in the engineering application, the core structure of the CT is optimized, and the key parameters of the core material are analyzed. Finally, the appropriate core material is determined.
In addition, a simulation model and an experimental prototype were built. The finite element simulation shows that the open-close structure core has stronger anti-saturation ability than the non-air gap structure core, and the core's air gap width significantly influences the device's electrical parameters. The circuit simulation shows that after a one-time correction of the device by adjusting the working mode of the VSR, the device achieves maximum power output while maintaining the resonant state. The experimental results show that the extracted energy method can meet the power demand of some low-power online monitoring equipment. The optimized CT core structure effectively improves the complexity of the traditional 180° open core structure in the winding and installation process of the device CT, which shows good engineering application potential.

Key words： Current transformer power tapping from ground wire open-close magnetic core virtual impedance matching

Received: 20 November 2024

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TM452

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	Feng Bo
	Liu Zeyang
	Yang Yi
	Zhong Jiayong
	Fu Liyan

Cite this article:

Feng Bo,Liu Zeyang,Yang Yi等. Ground Wire Induction Energy Harvesting of Overhead Transmission Lines Based on Virtual Impedance Matching[J]. Transactions of China Electrotechnical Society, 2025, 40(14): 4431-4445.

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