TITLE:
An Integrated Drive for Two PMSMs Involved Automotive Applications and Development of Current Reference Expanded Two Arm Modulation Technique
AUTHORS:
V. Krishnakumar, V. Kamaraj, C. Adrien Perianayagam
KEYWORDS:
EV/HEV Traction Drive, SVPWM, Five Leg Inverter, Two Permanent Magnet Synchronous Motor Drive, Current Reference Expanded Two Arm Modulation (CRETAM), Expanded Two Arm Modulation (ETAM)
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.8,
June
20,
2016
ABSTRACT: A five leg inverter (FLI)
control is incorporated to drive two independent rated permanent magnet
synchronous motors (PMSMs) for automotive applications. Literature evidences
many attempts of employing the FLI for controlling two general purpose/special
motors, where variety of modulation techniques has been practiced for
performance enhancement. Also in these cases one leg of inverter is common to
both the motors. The expanded two arm modulation (ETAM) has been generally
engaged in FLI. In ETAM the percentage voltage utilization factor (VUF) is
calculated based on “αmax”, where “αmax” is
the maximum modulation index and equal toand
hence it restricts the VUF to 50%. This makes the FLI drives to use the dc link
in inefficient way, which is due to the fact that conventional ETAM works with
voltage reference. This paper modifies the ETAM in an ingenious way to improve
the VUF further through current reference. In addition, the developed current
reference expanded two arm modulation (CRETAM) minimizes the current harmonics
and torque ripple as well. A detailed comparison of the CRETAM with the
conventional ETAM and the competent digital counterpart, space vector pulse
width modulation (SVPWM), is also presented. The enhancement in VUF, torque
ripple minimization and current total harmonic distortion (THD) reduction are
found in the MATLAB based simulation results.