The High-Speed Permanent Magnet Synchronous Motor (HSPMSM) drive system has two characteristics: small electromagnetic time constant, and low carrier frequency ratio of high-speed zone. These two non-ideal factors cause severe current ripple, which affects the efficiency, vibration noise and electromagnetic interference of the HSPMSM drive system. To suppress the current ripple, an improved low-loss space vector modulation algorithm is proposed based on a SiC-MOSFET/Si-IGBT hybrid inverter. The generation method of the zero voltage vector and the switching operation sequence are adjusted to transfer most switching actions to SiC-MOSFET and provide zero-voltage switching conditions for Si-IGBT. The switching loss of the inverter is then reduced, thereby improving the efficiency of the system and the available switching frequency. Improvement of the switching frequency effectively reduces current ripple. To further optimize the ripple performance, the ripple characteristics are analyzed. An optimal peak quadrature-axis current ripple modulation algorithm is proposed based on the variable switching frequency mode. The carrier frequency is adjusted in real time according to the predicted peak value of q-axis current ripple. The q-axis current ripple is averaged by means of peak load shifting, so as to disperse switching energy under the condition that the average switching frequency remains unchanged. The electromagnetic compatibility performance and vibration noise are improved. The proposed scheme has the advantages as follows: compared with the traditional inverter, the switching loss is reduced, the efficiency is improved and the switching frequency is increased to reduce the current ripple; compared with the traditional space vector modulation algorithm, the voltage vector generation method is improved. The carrier frequency is used to disperse the energy, and the peak value of the quadrature axis current ripple is reduced. Simulations and experiments executed on a HSPMSM verify the effectiveness of the proposed algorithm.
WANG Xiaolin
,
LIU Yuting
,
GU Cong
,
PENG Xuheng
. Optimization of space vector modulation strategy based on hybrid inverter[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2021
, 42(7)
: 324673
-324673
.
DOI: 10.7527/S1000-6893.2020.24673
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