Study On Wireless Passive Surface Acoustic Wave Temperature Realtime Monitoring System For Smart Grid

Electric power industry plays an important role on development of national economy and stability of daily life,the premise of realizing the smart grid is to ensure all aspects of the safe operation of high voltage equipment in the power system.Temperature as an important parameter to reflect the operating status of high voltage equipment.The effective monitoring method for temperature status of high voltage equipment can provide the first-hand information for work personnel,thus contributing to load analysis and status assessment of power equipment.And it will be help for troubleshooting and load testing to ensure the safety and stability of equipment operation.On the basis of existing power industry temperature monitoring scheme,surface acoustic wave(SAW)relevance theory and temperature sensing technology are summarized in the paper.In the view of existing limitation such as complex installation,power difficulties and low reliability,a real-time temperature monitoring scheme based on wireless passive SAW sensors is proposed.And a series of related study and implementation work for this scheme is developed subsequently.The scheme is different from the conventional method,the temperature information of high voltage equipment is acquired by resonant frequency change information,which is measured by SAW sensors.The reason why reflects the great potential in the field of smart grid status monitoring is due to wireless passive,high sensitivity,low cost and strong anti-interference characteristics.A real-time temperature monitoring system is designed based on the scheme in the paper,and the software and hardware design and implementation of the system is completed,the system insists of SAW sensors,reader and data processing module.First,considering all kinds of sensor sensing characteristics and usage scenarios.The scheme used SAW resonant sensors as sensing components of the acquisition node,which is distributed on key position of high voltage equipment for real-time acquisition of temperature information.Second,considering correlation characteristics of SAW with actual production.The scheme used synthesis thinking of step frequency continuous wave to design reader's transmitter link and receiver link for node management and information interaction.And the paper did analysis and testing structural principles and performance of its internal functional module,so as to provide data support for subsequent data processing.Finally,the data processing module used the data query in coherent integral to receive and process the baseband signals form the reader.And the temperature information of high voltage equipment is acquired by host computer interface with storage and display function.In this paper,the simulated platform is set up.The feasibility and superiority of the temperature monitoring scheme based on the wireless passive SAW sensors are verified by static temperature measurement,and the experimental error and reason of affecting the system performance are analyzed.The experimental results showed that the system monitoring accuracy is to meet the ±1?,which is consistent with theoretical analysis and monitoring requirements.And the system temperature resolution is up to 0.15? under ideal conditions,multi-objective temperature monitoring can be realized at the same time.Therefore,the system has certain practical value and wide application prospect.