Multi-coil Wireless Power Transmission System For Power Supply Of Overhead High-voltage Line Monitoring Equipment

Overhead high-voltage monitoring equipment can perform all-round,multi-functional real-time monitoring of the operation status of the transmission line network.It is an effective method to maintain the stable operation of the transmission line and one of the major technical supports for the construction of a smart grid.But the power supply of its monitoring equipment still does not solve the problem of sustainable power supply.Therefore,this article focuses on solving the problem of sustainable and high efficiency power supply.The main research work of this paper is as follows:(1)For multi-coil wireless energy Transmission and high-voltage110 kv creepage distance,design the parameters of the relay resonant coil,and verify the correctness of the designed coil parameters through software modeling simulation and design related experiments.The coil parameters include winding structure,winding material,coil size,coil self-inductance,mutual inductance between coils,and high-frequency impedance.This work plays an important role in the design of high-quality resonant coils.(2)Theoretical and experimental comparative analysis of different wireless power transmission structures.This include theoretical and experimental analysis of the transmission characteristics of 2-coils,4-coils,and 6-coils.The specific analysis is as follows: 1.Input impedance amplitude-frequency characteristics analysis;2.Output power and efficiency characteristics and analysis;3.Coil spacing D,frequency,receiving coils load’s influence and analysis on frequency splitting in transmission characteristics;4.The influence and analysis of the number of relay coils and coil spacing on the transmission performance.This work plays a vital role in optimizing the performance of multi-coil WPT.(3)According to the overhead high-voltage transmission line induction power supply and monitoring equipment power demand,build a monitoring equipment power supply system.It mainly includes the following three aspects: 1.Design E class high frequency inverter drive circuit;2.Build a multi-coil wireless power transmission resonance system;3.High frequency rectification and filtering and voltage stabilization circuit design.Experimental results show that in the energy transmission of 6-coils the transmission distance is 400 mm,the load range is 20Ω～70Ω,the maximum output power is 13.87 W,and the average transmission efficiency is about 52%.The transmission performance is far better than other transmissions under the same conditions.structure.Finally,the power scheme of multi-coil wireless energy transmission in high-voltage transmission lines is simulated,and the camera works successfully.The experimental design and analysis can provide a basis for the design of the power management module of the receiving coil,and can also be used as a reference for 66 KV,220KV,500 KV and other transmission lines to provide power to the transmission tower.