Design And Analysis Of Three-phase Power Quality Analysis System Based On DSP+ARM

In the wake of the rapid growth of energy and power technology,a lot of distributed new energy sources and loads are connected to the grid,and people’s demand for high-quality power is getting higher and higher,and power quality has become a hot spot of people’s attention.Therefore,as a prerequisite for improving power quality,research on power quality detection and analysis is of great significance.At the same time,the development of a power quality analysis system that can run on embedded devices is also an important process in the development of smart power meters.The article studies the related algorithms of power quality analysis,and proposes a hybrid algorithm for analyzing interharmonics and transient signals and a transient disturbance location algorithm,and the effectiveness of these two algorithms is proved through simulation experiments.In addition,the article designed a three-phase power quality analysis system based on DSP+ARM based on the algorithm introduced in the article,and realized the power quality signal detection,analysis,result display and human-computer interaction functions on the embedded platform.The experimental test verifies the design function and operational reliability of the system.The main content of the paper is as follows:(1)The way to calculate the basic information of power quality is introduced;the discretization calculation method of the flicker parameter is deduced;a four-spectrum interpolation algorithm based on the Blackman-Harris window is analyzed,which is used to calculate the whole harmonics.Analyze and verify the exactness of the algorithm by simulation experiments.(2)Aiming at the analysis of interharmonics and transient disturbance signals,this article proposes an improved Prony-GSO hybrid algorithm.This algorithm makes the calculation process of the traditional Prony algorithm more concise,and combines with the GSO algorithm to calculate more correct results.In addition,a transient disturbance location algorithm based on incomplete S-transform is proposed.This algorithm uses measured eigenvalues to locate the disturbance signal,which has a good analysis effect.(3)Developed a three-phase power quality analysis system that can run on the DSP+ARM embedded platform.Completed the development of ARM software on the Linuxbased operating system,designed a graphical user interface,and realized the functions of waveform and parameter display and human-computer interaction.Completed the development of the DSP-side software on the Windows operating system,and controlled the AD for signal acquisition and analysis of various parameters.Use the Syslink module to communicate commands and data between the dual cores,so that the dual cores can work together and complete tasks.