Research And Practice Of Key Technology Of Power Quality Acquisition And Analysis System Based On NB-IoT

Accurate and real-time power quality detection data is the basis for achieving good management and application of power in the three-phase power grid.It is also an important prerequisite for improving the quality of the power grid and preventing power emergencies.Therefore,it is necessary to build a stable and reliable power quality acquisition and analysis system.The emergence of the narrow-band Internet of Things NB-IoT has brought new ideas to the research of power quality acquisition and analysis systems.The NB-IoT-based power quality acquisition and analysis system involves hardware design,embedded programming,NB-IoT remote communication,human-computer interaction,and system maintainability.The core content of this thesis is as follows.(1)Based on the NB-IoT communication technology,a remote power quality acquisition and analysis system framework is proposed.The terminal NB-IoT communication application components and human-computer interaction system HCICom are designed to realize the upstream and downstream processes of power quality acquisition data.On this basis,the system hardware and software design and basic testing are given.(2)Based on the hardware communication,the hardware and software design of power quality acquisition terminal based on component method is given.The power quality acquisition module,main control module,NB-IoT communication module,etc.are designed on the hardware to ensure the restructuring of the hardware design;the basic components and application components are packaged on the software to increase the programming granularity of the software and rely on fast Fourier Transform FFT to realize power grid harmonic analysis.(3)Aiming at the difficulty of maintaining large-scale power quality acquisition terminals,a scheme for remotely updating terminal programs is proposed.This solution can overcome on-site environmental factors,use NB-IoT to realize terminal program update and function expansion,and reduce maintenance difficulty and cost.Finally,this thesis presents a set of renewable and maintainable remote power quality acquisition and analysis system.The performance test shows that the system has reached a high level in data accuracy and communication stability,and realized the remote upgrade of terminal program,and achieved the expected research goal,which has certain industrial application reference value.