Title :
A Low-Speed, High-Torque Motor Drive Using a Modular Multilevel Cascade Converter Based on Triple-Star Bridge Cells (MMCC-TSBC)
Author :
Kawamura, Wataru ; Kuan-Liang Chen ; Hagiwara, Makoto ; Akagi, Hirofumi
Author_Institution :
Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol., Tokyo, Japan
Abstract :
This paper provides experimental verification of a modular multilevel cascade converter based on triple-star bridge cells (MMCC-TSBC) for a low-speed, high-torque motor drive. The TSBC is one of direct ac-to-ac power converters capable of achieving bidirectional power flow and drawing/feeding three-phase sinusoidal input (supply-side) and output (motor-side) currents with any power factor at both sides. This paper designs, constructs, and tests a downscaled drive system combining a 400-V, 15-kW, phase-shifted-carrier PWM TSBC equipped with four bridge cells per cluster and a 320-V, 38-Hz, 6-pole, 15-kW induction motor loaded at the rated torque. Experimental waveforms obtained from the downscaled drive system verify stable operation across a broad range from a standstill to the rated speed, showing satisfactory start-up performance.
Keywords :
AC-AC power convertors; PWM power convertors; induction motor drives; load flow; power factor; torque motors; MMCC-TSBC; bidirectional power flow; direct ac-to-ac power converters; downscaled drive system; drawing-feeding three-phase sinusoidal input; four bridge cells per cluster; frequency 38 Hz; high-torque motor drive; induction motor; low-speed motor drive; modular multilevel cascade converter; phase-shifted-carrier PWM TSBC; power 15 kW; power factor; triple-star bridge cells; voltage 320 V; voltage 400 V; Bridge circuits; Capacitors; Induction motors; Inductors; Motor drives; Voltage control; Direct ac-to-ac power conversion; medium-voltage motor drives; modular multilevel cascade converters (MMCCs);
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2015.2416130
