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The traction converter consists of a single-phase AC-DC rectifier and a three-phase DC-AC inverter. Due to special structural characteristics of single phase rectifier, a fluctuating voltage component with the frequency twice of the grid's, exists in DC-link voltage. Fed by fluctuating DC-link voltage, a beat phenomenon occurs in traction motor, and harmonic components appear in both stator current...
On the basis of the novel single-phase five-level rectifier based coupled inductor, two-octave instantaneous power of this rectifier is analyzed and the method of removing LC resonant filter circuit is proposed which can simplify the circuit structure, reduce the circuit size, and improve the power density of the rectifier. Corresponding formula derivation is carried on which shows that two-octave...
The acoustic noise spectrum in power electronic system is closely related to the spectrum of the voltage waveform and can be reduced by avoiding the concentration of harmonic energy in distinct tones. Frequency jitter and randomized pulse width modulation are two methods to reduce mechanical vibration and acoustic noise in power electronic. These two techniques can make the harmonic spectrum of inverter...
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