Abstract
The four-switch three-phase inverters have become an effective approach for fault-tolerant reconstruction and operation of the six-switch three-phase topology. However, the conventional control strategy for four-switch three-phase inverters can result in a large number of current harmonic components, high electromagnetic acoustic noise, and electromagnetic interference (EMI). Therefore, this paper proposes a random switching frequency pulse width modulation method under the centrosymmetry period with a two-state Markov chain based on four-switch three-phase inverters (RSFPWM-CPTMC). In this method, random numbers are optimized and evenly distributed on both sides of the center frequency within a specific frequency bandwidth range, which significantly reduces the current harmonics and EMI at the switching frequency and frequency multiplication. The spectral characteristics generated by the random switching frequency under the centrosymmetry period with the two-state Markov chain are evaluated and compared to that provided by the traditional fixed switching frequency pulse width modulation (FSFPWM). Simulations and experiments are carried out to illustrate the superiority of the proposal.
Highlights
In power electronics technology, as highly efficient and clean carriers of power conversion [1,2,3], voltage source inverters have gradually penetrated into various fields such as power adapter, rail transit, and solar/wind power generation [4,5,6,7]
Based on the random carrier frequency modulation fixed duty (RCFMFD) strategy and the characteristics of the space vector pulse width modulation (SVPWM) waveform for four-switch three-phase three-phase inverters inverters (FSTPI), this paper proposes the RSFPWM-CPTMC strategy to reduce the current harmonics and electromagnetic interference (EMI) generated by switching between different sectors
It can be seen from Equation (13) that the component of power spectral density (PSD) at this time is mainly concentrated at the switching frequency and frequency multiplication, the amplitude of each harmonic is determined by |G(f)|2 /(Ts )2 when f = k/Ts, and these discrete harmonic energy are prone to generate EMI and other issues
Summary
As highly efficient and clean carriers of power conversion [1,2,3], voltage source inverters have gradually penetrated into various fields such as power adapter, rail transit, and solar/wind power generation [4,5,6,7]. The main contributions are as follows in this paper In this paper, this is the first time to provide a new RSFPWM-CPTMC strategy for FSTPI, which combines the proposed carrier under the centrosymmetry period with a two-state Markov chain to be a novel RPWM strategy. Based on the RCFMFD strategy and the characteristics of the space vector pulse width modulation (SVPWM) waveform for FSTPI, this paper proposes the RSFPWM-CPTMC strategy to reduce the current harmonics and EMI generated by switching between different sectors. By comparing the randomness of different random distribution modes, the simulation and experimental results based on RSFPWM-CPTMC strategy are presented to indicate the effective and superior performance of EMI compared to the conventional FSFPWM and RCFMFD scheme.
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