The Software Design Of Data Processing Of High-speed Power Waveform Analyzer

With the rapid development of modern society,modern measuring technology has become a significant part of information and science and technology,it also promotes the continuous progress of measuring instruments at the same time.Due to the unceasing increase of energy efficiency requirements of industrial equipment and production,how to ensure the accuracy of power measurement while processing large data signals has become a novel focus of measuring instruments.However,the domestic common oscilloscopes are incapable to deal with complex power analysis and harmonic operation,mainstream power analyzers do not have ability to achieve the user's demand to capture waveform information from the display in the meantime.Therefore,the high-speed power waveform analyzer developed in this project aims to design a comprehensive measuring instrument that integrates the functions of oscilloscope and power analyzer.It not only has the functions of traditional oscilloscope such as waveform display,waveform storage and waveform trigger,but also can realize high-precision power calculation and high-speed harmonic analysis for large amount of data.This paper mainly focuses on the two most important functions of power waveform analyzer,namely power operation module and harmonic operation module,moreover it achieves the software design and implementation on project platform.The paper mainly achieves the following software functions:1.Identify the information about hardware cards,design multi-channel control schemes to get waveform data,and configure the test system flexibly according to the wiring mode of the circuit under test.Each test unit in the system can complete independent measurement of 34 power parameters and harmonic analysis up to 500 times.2.The software design and implementation of the power operation module is introduced in detail,including the whole flow path of the power operation module,the acquisition and storage of original data,and the design and implementation of the frequency measurement part.At the same time,it is pointed out that there are some insufficiency in accuracy and stability in frequency measurement and power parameter operation.Then multi-aspect modified methods are put forward,including delay and compensation function,sliding linear average algorithm,the optimization of frequency measurement and frequency locking function.These modified methods improve the accuracy and stability of power analyse module efficiently.3.The software development of harmonic analysis module is deeply studied,including the software realization of harmonic computing method and the calculation function of harmonic parameters.At the same time,since the sampling rate of the high-speed power analyzer reaches 100MS/s,there is a large amount of data needs to accomplish the spectrum analysis in the harmonic operation function,and the variable-point FFT function in the waveform display mode needs to calculate the FFT of 100 k points at most,so this project has a high requirement for the speed of spectrum analysis.In order to improve the speed of spectrum analysis,this paper applies an improved FFT algorithm,namely Sparse Fourier transform algorithm(SFT),in the power waveform analyzer.This paper briefly introduces the method about the design of SFT algorithm,conducts simulation and performance analysis.Finally,the SFT algorithm is completed on the project platform.The paper introduces the software design process,and verifies the effect.SFT algorithm improves the speed of spectrum analysis definitely in harmonic analysis function and variable-point FFT function.4.The display module of power analysis and harmonic operation is introduced,and the various display formats in power mode are presented in the paper.