Research On Embedded Power Information Acquisition System

With the introduction of the national "dual carbon" goal,the electrification situation has become inevitable,and the use of electric energy has become more and more extensive.In order to ensure the safety and stability of power supply,the electric energy management system needs to optimize the management of power resources to ensure the stability of the power system.As an important part of the power system,the power information acquisition system can realize remote real-time collection of power data and upload it to the main station center,which is convenient for information management.The management system provides green electricity decisions.According to the demand of electricity data acquisition and data transmission,this thesis designs a power information acquisition system based on u C/OS embedded real-time operating system.The system includes the design of power module,communication module and storage module.In view of the problems existing in the current electric energy information collection system: the communication mode is few and the efficiency is not high;the long-distance communication data volume is large,and the communication cost is high.This thesis studies,designs and proposes solutions from the following aspects:（1）Aiming at the limitation that the electric energy information acquisition system generally uses a single communication network for data transmission,a variety of communication networks are used to realize the transmission of electric energy data.Through research and comparison of several communication methods,this thesis chooses to use RS485 communication between the acquisition terminal and the smart meter,and use 4G,LoRa（Long Range Radio,LoRa）and Ethernet for communication between the acquisition terminal and the master station.Taking into account the requirements of terminal communication flexibility and network transmission speed,it realizes long-distance,high-speed and stable transmission of power data.（2）In order to solve the problem of large amount of communication data and high communication cost in the process of data transmission,this thesis combines LZO（Lempel-Ziv-Oberhumer,LZO）lossless compression technology and run-length coding technology to study the data compression scheme.When the terminal collects electric energy data,the frame data is transposed and preprocessed to make it appear continuous and repeated,which conforms to the coding rules of run-length coding technology.The file is then re-encoded using LZO.After experimental verification,the scheme improves the communication efficiency of data transmission,and provides a feasible scheme for high-frequency data acquisition and large-scale data transmission.（3）In order to realize the visualization of the parameter configuration interface and facilitate the staff to configure parameters,debug equipment and view data on site,this thesis designs the upper computer software based on Qt software.The host computer software can set the parameters of the acquisition terminal through RS232 serial communication,the RS485 acquisition circuit collects the power data according to the downlink acquisition parameters,and the communication module connects to the main station server according to the system parameters and uploads the power data for the main station staff to analyze,Process and monitor electricity usage information.（4）Functional test and verification analysis of the power information acquisition system.Before the application of the system,a touch-type fully intelligent combined interference generator is used to conduct electromagnetic compatibility（EMC）tests in three aspects: surge,fast transient pulse group and static electricity to ensure the anti-interference performance of the system in the electromagnetic environment.,have been tested in line with national standards.The acquisition terminal,the host computer software and the server are used as the experimental platform to verify and test a series of processes such as the system’s acquisition parameter distribution,power data acquisition,server connection and data uploading to the main station.The test shows that the power information acquisition system designed in this thesis meets the design requirements.