Abstract The existing SVPWM (space vector pulse width modulation) overmodulation algorithm is complex and involves division operation. Hence, a new type of splitting variable modulation waveform was developed. The modulation waveform is a sinusoidal wave in the linear range of modulation index M∈[0, 1], while in the M∈(1, 4/π) overmodulation range, the sine wave is split into two sinusoidal curves that can be changed independently. The two splitting curves are connected to form a new modulation waveform. The area of the new modulation waveform further expends with the increase of M until approaching the square waveform. In the linear range, through a triangle carrier waveform sampling, changing the modulating waveform height linearly changes PWM fundamental amplitude. In the overmodulation range, reducing the splitting angle further increases the fundamental amplitude till approaching a square waveform. The optimal splitting angle’s initial value can be obtained by studying the relationship between the harmonics of PWM in overmodulation range and the initial value of splitting angle. The new PWM algorithm is simple. Compared to SPWM, its total harmonic current distortion THD is identical in the linear range; and it is still continuously lower at M∈(1, 1.2] overmodulation range. The experimental results had been confirmed the validity and superiority of the new technique.
Wang Rongsheng. A Novel PWM Overmodulation Technique Based on the Splitting Variable Modulating Waveform and Harmonic Influence Analysis[J]. Transactions of China Electrotechnical Society, 2017, 32(10): 206-213.
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2017, Vol. 32 
