Research And Engineering Application Of The Key Technology Of Broadband Carrier High Speed Communication Of Low Voltage Power Line

Low-voltage Power Line Carrier(LVPLC)communication refers to a communication mode that uses low-voltage power lines(LVPL)(380/220 V subscriber Line)as the information transmission medium for voice or data transmission.LVPL can be seen everywhere in daily life,with a wide distribution range.If the existing low-voltage power line is used as the communication channel,the construction cost can be greatly reduced and it is not easy to be damaged.Therefore,the research and application of high-speed and stable low-voltage power line carrier communication technology have important theoretical significance and engineering application value.First of all,the paper introduces the distribution network carrier transmission application background and the research and development situation at home and abroad,points out the current broadband carrier technology power consumption is too large,the cost is too high and not compatible with the existing narrowband carrier phase recognition is insufficient,can not for largescale application in power-expenditure information acquisition system and other aspects.Then,based on the power line carrier transmission theory,the impedance characteristics,signal attenuation characteristics,noise characteristics,etc.of the low-voltage distribution line channel within the frequency range of 1MHz~30MHz are mainly studied.This paper simulates the field power supply circuit,studies the signal frequency attenuation characteristics of the line impedance of the power supply circuit itself in the broadband band,and gives the corresponding results by means of laboratory test,and analyzes them.Finally,the noise classification is summarized and analyzed independently,the noise measurement method is studied,and the noise in the actual lowvoltage distribution network channel is measured.Thirdly,the paper introduces and studies the key technical specifications of the physical layer and data link layer,and makes detailed system design scheme,specific implementation scheme and terminal development scheme.The composition of power generation of broadband carrier products is analyzed.According to the characteristics of communication chip,the factors of power consumption are analyzed.This paper analyzes and verifies the reasons for the short communication distance of the existing broadband carrier through testing,analyzes the field demand for communication distance in combination with the environment of low-voltage distribution network,and makes the long-distance technical scheme.Fourth,emphasis is placed on the research of broadband carrier communication laboratory and field performance testing methods,further improve the detection efficiency and the intelligent detection system,in order to speed up the broadband power line carrier technology applied in electric power information collection system construction provides important technical support.Finally,combined with the rural,urban and urban areas such as the actual site measurement,and data analysis.Finally,the research work of this paper is summarized and prospected.