Suppressing Harmonic Spikes for 3×6 Indirect Matrix Converter via Dynamic Periodic PWM

• Published in: IEEE transactions on power electronics 2024-11, Vol.39 (11), p.14988-15000
• Main Authors: Zhou, Zhanqing, Xue, Lingyue, Yu, Chaojian, Geng, Qiang, Shi, Tingna
• Format: Article
• Language: English
• Subjects: Dual three-phase permanent magnet synchronous motor (DT-PMSM); Electromagnetic interference; electromagnetic interference (EMI); Frequency modulation; Harmonic analysis; matrix converter (MC); Matrix converters; Permanent magnet motors; Pulse width modulation; spread-spectrum modulation (SSM); Switching frequency; Voltage control
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2024.3440341

Considering the large number of switching devices and complex input/output coupling in multiphase indirect matrix converter (IMC) drive, it is difficult to establish the periodic pulsewidth modulation (PWM) strategy according to the current ripple index. To solve this problem, this article proposes a dynamic periodic PWM (DP-PWM) strategy with flux ripple locus for 3×6 IMC drives. First, we analyze the limitations of classic periodic PWM on the 3×6 IMC drive. Second, the flux ripple locus is established from the voltage errors. And, the mapping relationship between flux fluctuations and input/output variables is constructed. At last, the conventional current ripple index is replaced with the flux ripple locus, then a novel frequency density function employed in DP-PWM, which has the same distribution as the flux fluctuations is designed. Theoretical and experimental results show that the flux ripple locus can accurately reflect the coupling relationship between the grid- and output-side of 3×6 IMC drives, as well as the losses of motor system. This ensures that DP-PWM has uniform harmonic distribution while optimizing system operating efficiency and quality.