Research And Design Of Smart Meter With Internet Of Things Based On DSP Processor

As an important terminal equipment in power distribution,smart meter has become a research hotspot in recent years,due to its functions such as Internet of things transmission,power harmonic analysis,anti stealing power,time-sharing billing in peak and valley periods.This thesis focuses on harmonic suppression,the overall design of smart meter,the design of software and hardware of smart meter,and the construction of experimental platform of three-level shunt APF with three-phase three-wine NPC structure and LCL filter.Smart Meter with Internet of Things Based on DSP Processor.Firstly,the working principle of smart meter,the calculation of active power and reactive power are described.Aiming at the problem that the measurement accuracy of smart meters is affected by harmonics,a fast Fourier detection method based on complex sequence split basis is proposed.Compared with the traditional Fourier transform algorithm,this method reduces the times of multiplication and addition,improves the accuracy and speed of operation,not only overcomes the problems of spectrum leakage and fence effect of fast Fourier transform,but also improves the measurement accuracy of smart meters.Secondly,the overall scheme of smart meter is designed.Firstly,the social demand of smart meters is analyzed.Then,this paper describes the principles of smart meter design,and introduces the functions of smart meter design.Finally,the overall design scheme and function modules of the smart meter are designed in detail.Among them,the function modules mainly include metering function,anti stealing function,time-sharing charging function in peak and valley period,wireless communication technology and IOT function of smart meter.Thirdly,the hardware and software of smart meter are designed.In view of the hardware part of the smart meter,the DSP minimum system,DSP function module,external storage module hardware,PWM output alarm,data acquisition module,energy metering module,RS485 communication module and Wi Fi wireless communication module.According to the software part of smart meter,the development process and development platform of the software system are described.The main program and hardware driver are designed,including AD sampling program,display program and Wi Fi communication interface program.The algorithm of each module is analyzed in detail.Finally,the intelligent meter experimental platform is built,the main parameters of the intelligent meter experimental platform are given,and the signal source,debugging software and PCB package required in the test process of smart meter are selected and analyzed.This paper analyzes the electric energy measurement effect and error of intelligent meter.Finally,the correctness of the theoretical research in the previous chapters is verified on the experimental platform.This thesis includes 36 pictures,11 tables and 99 references.