Power Quality Monitoring And Analysis System Based On Virtual Instrument

In recent years, with the rapid development of modern industry, the application of power electronic devices become increasingly widespread, harmonic pollution and brought more and more serious, have a serious impact on the power quality, but also for a variety of electrical equipment properly run a negative impact. Harmonic measurement is the main aspect of the study harmonic problems, real-time and accurate detection of power harmonic content, the exact grasp the actual situation of the grid harmonic harmonic safeguards to prevent harm to the safe operation of the power grid is essential.This paper first describes the causes of power system harmonics, harmonic hazards as well as a variety of power system harmonic analysis and detection methods.Fourier transform simple harmonic detection method, instantaneous reactive power theory, comparing the advantages and disadvantages of neural networks, laying the groundwork for further action with reference to the instantaneous reactive power harmonic analysis and detection method based on. First, this study focused on instantaneous reactive power theory based on comparison of two harmonic current detection methods method and method. In this paper, the use of the algorithm, the method is not only applicable when the grid voltage distortion at the grid voltage asymmetry are equally effective, the original current signal separation in different frequency bands, and then complete the separation of the fundamental and harmonic harmonic reaches of the grid wave current detection function. Finally, ip-iq algorithm based on instantaneous reactive power theory, the simulation results are given to verify the validity and correctness of the conclusions of the method.On the basis of these theoretical studies on the design of power quality monitoring software based on LabVIEW. Analysis of the feasibility of using virtual instrument technology development power quality analysis system. Then the voltage deviation, frequency deviation, harmonic and phase imbalance as the main object of study, the mathematical model of the power quality indicators were studied and discrete treatment. Then determine the overall system design, focuses on the development of the system using LabVIEW various functional modules.