Study Of Power Signals Decomposition And Measurement Algorithm Based On Wavelet Sub-Band Filter Banks

The electrical harmonic pollution is getting more and more serious. Accurate measurement of active and reactive power in electric network is the foundation of metering and billing charges in the power system, and it is the basis of reactive power regulation. In the past few years, wavelet-based power measurement algorithm has been proposed. It can meet the time-frequency decomposed request and measure power in specific frequency bands effectively. Wavelet-based power measurement algorithm brings a new idea to power metering. Scholars have made preliminary research recently on its application to power measurement and gained some academic achievement. But according to the articles published, wavelet-based power measurement algorithm is still at beginning stage. Many problems should be further researched for its actual application.Wavelet-based power measurement algorithm was intensively studied in this thesis. The study has focused on: 1) The research background and the current state of the power measurement were analyzed systematically, and then wavelet-based power measurement algorithm was certified feasible for astable signals; 2) We developed a new method of RMS and power measurement based on Dmeyer wavelet. After that three other wavelet measurement approaches were compared with Dmeyer wavelet-based measurement approach. Then the impact on measurement errors of amplitude frequency property and energy leakage of wavelet filter banks were deeply researched, and some measures were proposed to reduce it; 3) We developed a new strategy of power measurement algorithm based on lifting wavelet, which had calculation advantage compared with the first wavelet, so that it was more suitable for the realization of hardware; 4) The running system of wavelet-based power measurement algorithm based on DSP was proposed, and then it was realized on ICETEK-VC5416-A EVM board; 5) Existing problems and the further research direction of wavelet-based power sub-band measurement algorithm was discussed. The simulation results showed that the analysis methods and the measurement...