Large capacity variable speed PWM spatial vector type sub-harmon

Details Large capacity variable speed PWM spatial vector type sub-harmon Large capacity variable speed PWM spatial vector type sub-harmon

1991-11-26

1994-03-29

Wysocki, Jonathan

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 318801, H02P 700

Patent

active

052988481

ABSTRACT:
A large capacity (1-2 MkVA) driving system for variable-speed-driving an AC motor by a power converter (inverter, converter) in which GTO (gate turn-off) thyristors are used as switching devices. In this system, high frequency GTO thyristors are connected in series, power converters are multiplexed, the AC motor is used in its plural phases, instantaneous spatial vector PWM (pulse width modulation) control is performed, vector control for the motor is performed, and a circuit for recovering snubber energy for GTO thyristors and a power factor adjusting circuit are provided. Thus, this driving system provides a torque ripple of 1% or less, speed response of 60 rad/sec or more, efficiency of 95% or more and a power factor of 98% or more.

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