Reduction of Electromagnetic Interference for Permanent Magnet Synchronous Motor Using Random PWM Switching Method Based on Four-Switch Three-Phase Inverters

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.

A Unified SVPWM Fault Tolerant Control Algorithm for Single Leg Fault Reconstruction Topology of Two-level Inverter

“…Combining ( 6), ( 7) and ( 8 There exist only four nonzero basic voltage vectors in the inverter reconfiguration topology, and the phases of the four vectors are inconsistent under different bridge arm faults, which results in the differences in the judgment of target voltage vector sector, the selection of basic vector and the calculation of action time during SVPWM. The judgment of sector and calculation of basic vector action time are discussed in detail in [18], [19] and [20]. The conclusion of the above documents is that since the basic voltage vector of the inverter reconstruction topology is distributed on two coordinate axes when an A-phase bridge arm fault occurs, the sector judgment and the action time of the basic vector are relatively simpler, while the calculations of the other two faults are more complex.…”

“…Since the SVPWM of reconstructing topology in case of a phase A bridge arm fault is the simplest [18][19][20], the voltage vectors of phase B and C bridge arm faults in Figure 4(b) and Figure 4(c) can be rotated through coordinate transformation, to be consistent with Figure 4(a). Taking the phase B bridge arm fault as an example, the coordinate rotation transformation matrix is calculated.…”

Control of Permanent Magnet Synchronous Motors for Track Applications

“…By merely modifying the speed and frequency amplification in PMSM (Permanent Magnet Sychronous Motors) drives, it is possible to reduce the number of aberrations. [46] demonstrated a new technique and implemented the dynamic spread spectrum technology, RSFPWM (random switching frequency Pulse Width Modulation) under centrosymmetry period with a two-state Markov chain (CPTMC). Enhanced electromagnetic ambient noise radio spectrum features can be attained by optimizing the random number distribution.…”