Research On Analysis And Monitoring Technique For Heat Fault Of Wind Power Busbar Trunk

Wind power busbar trunk power transmission system,as an important component of wind power generation,whose heating problem caused by vibration of tower tube is one of the key factors that affect the safe and stable operation of wind turbine.Therefore,according to the analyzing of the temperature distribution characteristics of the busbar trunk connector under different vibration levels,the installation position of the temperature monitoring sensor is determined,and combined with the new sensing measurement,data processing,communication and other technologies,the on-line monitoring system is designed,which has great engineering significance to realize early warning and positioning of the busbar trunk heat fault.Firstly,the three-dimensional temperature field model of busbar trunk connector is analyzed,and the actual operation conditions of busbar trunk and the heat transfer characteristics of the connector various components are considered,the numerical simulation methods and calculation formulas of each heat source load and boundary conditions are given.In allusion to the heating problem during the operation of busbar trunk connector,the finite element analysis model of 1400A(1k V)connector was established,the temperature distribution characteristic of the whole connector model and the change rule between the temperature of the key components and the fastening torque are obtained,by the calculation of the temperature field distribution under different vibration levels,as a consequence,the maximum of the temperature during the heating process and the specific location of the sensor monitoring are acquired.Secondly,based on the temperature field analysis of busbar trunk,a heat fault on-line monitoring system of wind power busbar trunk is designed,which can real-time collect the temperature rise information of each connector by the infrared temperature sensor and the temperature collector of the monitoring extension front-end unit,and combine the backstage expert software to complete running status on-line monitoring and heat fault early warning.In the aspect of state feature quantity monitoring,this paper designed a special infrared temperature sensor to measure the each phase conductive row temperature of connector,and the temperature calibration and digital compensation are achieved by the least square polynomial fitting algorithm which embedded in the temperature collector.In the design of data communication,communication technologies such as the RS-485,Zig Bee and GPRS are adopted to establish reliable data transmission between each module,and the Mod Bus protocol is embedded in the software design of the monitoring extension to realize the command interaction and remote monitoring with the background monitoring center.Finally,based on the temperature field finite element analysis,the effective monitoring position of the sensor is verified by experiments,and through the construction of experimental platform to test the performance of the system,including the infrared temperature measurement experiment,the ambient temperature measurement experiment,the running state monitoring experiment,the strong electric field interference and electromagnetic compatibility experiments.The results show that the relevant theoretical research has reference value for the heat fault effective monitoring of busbar trunk.The heat fault on-line monitoring system of wind power busbar trunk achieves the expected goal,which can realize the operational status real-time monitoring and fault early warning.