Research On The Galloping Monitoring And Parameter Identification Of Transmission Lines

The construction of UHV and intelligent power transmission network in China is developing,and the scale,capacity and geographical span of power grid are expanding.Therefore,the galloping disaster of power grid affected by bad weather conditions also increases.Transmission lines galloping can cause accidents such as line breakage and tower collapse,which seriously threaten the safe operation of power grid.In order to optimize the mechanism of galloping,quantify the impact of natural climate on galloping,prevent galloping and give safety warning when dancing occurs,the characteristic parameters dancing amplitude and frequency are needed.Aiming at this demand,this paper researched on galloping monitoring and characteristic parameter identification technology,designed the galloping monitoring system,presented the galloping characteristic parameter identification algorithm.Finally,that was verified according to the actual galloping characteristics in the laboratory environment.In this study,the galloping monitoring system consists of the on-line sensor and the monitoring terminal on the tower.The on-line sensor is connected with the transmission line to monitor original motion parameters of galloping acceleration and angular velocity through the six-axis inertial sensor.The monitoring terminal on the tower can identify galloping amplitude and frequency according to the original motion parameters.At the same time,Zig Bee wireless transmission is adopted between the two systems to transmit the original parameters of the motion.The amplitude and frequency of galloping are transmitted to the data monitoring center through Bluetooth mesh and 4G.To make the galloping monitoring system work stably for a long time,the combination of lithium battery and solar cell is used for power supply,and the system power consumption is simulated and estimated to ensure the rationality of power supply design.The galloping characteristic parameter identification algorithm includes sensor calibration and data preprocessing,and the identification algorithm described galloping attitude updating principle and the Mahony algorithm in detail,according to the actual requirements of the subject,an improved self-adaptive Mahony algorithm is also proposed.In order to identify the galloping amplitude,the identification algorithm also proposed the method of time-frequency mixed integration of acceleration information and the method of identifying the galloping frequency in time domain and frequency domain.Finally,in the laboratory environment,according to the motion characteristics of line galloping,the linear and rotary motion tests based on horizontal sliding table and single axis turntable are designed.The rationality of the design and implementation of the circuit,wireless transmission and algorithm of the galloping monitoring system is comprehensively verified.The results show that the system can work stably and effectively,and the relative error of galloping amplitude identification is 4.5%,the identified frequency is basically consistent with the actual motion frequency,the achievement meets the design requirements.