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Study on Sub-band Power Measurement Based on IIR Wavelet Filter Bank

GAO Zhao1,FENG Xue-jun2,ZHANG Jin-qiang3(1.Tangshan Teachers' College,Tangshan 063000,China;2.Tianjin Seamless Steel Pipe Plant,Tianjin 300220,China;3.Taiyuan University of Science and Technology,Taiyuan 030024,China)  
Sub-band RMS,real power and reactive power measurement principle and algorithm based on wavelets were introduced firstly,then analyzed the structure and constitute of IIR two channels filter bank,and compared this method with FFT.Actual data of Xi'an Chemical Plant were adopted to test the measurement method of sub-band RMS,real power and reactive power.The results were accurate,and its precision could reach 10-5.
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