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Multiplicity of Solutions to Nonlinear SHEPWM and Wavelet Modulation

Author: FuYongHua
Tutor: ZhangBo
School: South China University of Technology
Course: Power Electronics and Power Drives
Keywords: Inverter SHEPWM technology Wu's method Wavelet Transform
CLC: TM464
Type: Master's thesis
Year: 2011
Downloads: 109
Quote: 0
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Abstract


Selective Harmonic Elimination Act (SHEPWM) is PWM technology in one, having to eliminate specific harmonics advantages. The switching angle SHEPWM Fourier transformed by a nonlinear equation to determine SHEPWM , and Fourier transform does not have the time and frequency localization capabilities, making SHEPWM nonlinear model of multiple solutions exist . Wavelet analysis has the advantage of having a good time and frequency localization capabilities , has been widely used signal processing , numerical analysis , seismic exploration and other fields, to become the focus of attention of many disciplines together . With the development of wavelet theory , wavelet theory can be applied to the inverter modulation . In this paper, Wu's method for three-phase unipolar and bipolar SHEPWM solving nonlinear model , verify that multiple solutions of nonlinear model , then the wavelet modulation is applied to the pulse width modulation inverter , the final results will SHEPWM wavelet modulation results were compared . The main contents are as follows : ( a ) shows the three-phase inverter unipolar and bipolar SHEPWM nonlinear model, using Wu method to find the three-phase inverter unipolar and bipolar SHEPWM switching angle K = 3 and K = 4 when all the solutions , there are several solutions SHEPWM verification . ( 2 ) using wavelet modulation techniques on the inverter pulse width modulation, the modulation method for simulation, the simulation results show that it has a smaller harmonic distortion . ( 3 ) the single-phase three-phase inverter output voltage waveform wavelet modulation harmonic distortion rate with single- phase three-phase unipolar SHEPWM harmonic distortion rate compares results show that : the wavelet modulation inverters with algorithm is simple and easy to implement, low harmonic content and waveform unique advantages.

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CLC: > Industrial Technology > Electrotechnical > Transformers, converters and reactors > Converter > Inverter
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