Power Quality Monitoring And Analyzing System Based On Internet

Monitor and analysis of power quality in power supply system is the precondition for treating and improving the power quality of power supply system, and it is great significant for ensuring safe operation of power supply system and safe consumption of customer. At present, the function of most domestic power quality monitors is simple and part of the measure arithmetic used by them cannot satisfy the demand completely. A novel method is proposed in this paper by research on complex wavelet, in which phase information of complex wavelet transforms is used to detect frequency and harmonics. Aiming at the defects that lies in the method of analyzing transient waveform, a novel short time Fourier transform based on the special frequency component is proposed to analyze transient waveform. At last, power quality monitoring and analyzing system based on Internet is developed in the LabVIEW environment. The results of online measurement show that this system can effectively monitor and analyze power quality.