Design Of Data Acquisition And Analysis System For Distribution Internet Of Things

In the power industry,information and communication technology(ICT)has gone through the stages of digital substations and smart grids,and is developing towards the Internet of Energy.Electric energy production,transmission,consumption,management,and applications are closely integrated under the support of ICT.As the end of power energy transmission,the distribution network has a low voltage level,a wide distribution range,and uneven communication capabilities.It is the weak link in the current digital development of the entire network.The reason is that on the one hand,there is insufficient investment in the construction of the end of the power grid,on the other hand,the current power-related information and communication technology needs to be developed.To this end,this paper participated in and completed the design of a new generation of distribution data acqusition and analysis system,the main work is as follows:(1)Aiming at the related requirements of energy measurement of distribution Internet of Things,a data acquisition and analysis system that comprehensively collects energy consumption data of various voltage levels is designed.breaking the original“weak correlation”mode independently collected by various departments of the power system,and providing“strong correlation” data for power business applications.The system includes: a cloud-based data master station,heterogeneous network fusion communication channels,heterogeneous multi-mode communication terminals,an Io Tbased acquisition protocol,and a clock-transparent transmission mechanism for the entire network.The cloud-based master station provides data clocking and numerical processing capabilities,the Internet of Things acquisition protocol provides the ability to meet business concurrency,storage,and transmission needs.The heterogeneous network fusion communication channels and heterogeneous multi-mode communication terminals ensure the reliability of the communication channel.(2)Improved existing electricity information acquisition protocol.Referring to the object-oriented idea of IEC62056 standard for energy measurement,the DL/T645 protocol used by electricity meters in the electricity information acquisition system is selected to be combined with MQTT protocol used in the Internet of Things.Changing the original segmented acquisition mode can meet the needs of multi-point concurrency and improve the success rate of business acquisition under the uncertain conditions of the transmission channel.In a typical test scenario,the success rate of business acquisition under the condition of wireless public network is not less than 99.9%,and it has good scalability to achieve plug-and-play of massive terminals.(3)Realized the data analysis of the acquisition system for the typical business of the distribution Internet of Things.Multi-source and multi-level clock fusion technology is proposed to realize the transparent transmission of the clock of the entire network without affecting the encryption of the business,and the correlation between the data service clock and the communication network clock is established to successfully improve the clock accuracy of the collected data.Based on the characteristics of electric power business,a reasonable data numerical processing method is selected to support 5-minute update of 15-minute transactions of grid operation data.In a typical scenario,the data error of positive active total energy at a single point in time is reduced by a maximum of 283.2 k W·h compared to the existing system within 10 minutes.The maximum electricity bill error can be reduced by 38.4 yuan.It fully meets the needs of the power spot trading market,and also provides field data with greater data volume and higher data quality for power system power load forecasting and other businesses to meet the needs of power data application businesses.The distribution Io T data acquisition and analysis system(technical demonstration verification)designed in this paper has successfully passed the pilot certification in the electric energy metering centers of Shenzhen and Guangzhou Electric Power Bureau.The next step will continue to optimize the technical details of the system for practical application to the existing power metering system.