A robust hysteresis current-controlled PWM inverter for linear PMSMdriven magnetic suspended positioning system
Bor-Jehng Kang; Chang-Ming Liaw
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 5, Oct 2001 Page(s):956 - 967
Digital Object Identifier 10.1109/41.954560
Summary:Hysteresis current-controlled pulsewidth modulation (PWM) is very
robust but it possesses nonconstant switching frequency, and it is
difficult to use for high-performance position servo applications. This
paper presents a robust hysteresis current-controlled PWM scheme for a
magnetic suspended positioning system driven by an inverter-fed linear
permanent-magnet synchronous motor having improved performance in these
two areas. In the proposed control scheme, the conventional hysteresis
PWM mechanism is augmented by a robust harmonic spectrum-shaping
controller. The error signal, which represents the switching frequency
deviated from the set one, is detected using a notching filter inverse
model. Then, the current command is adjusted by a robust compensation
signal. The hysteresis band can be equivalently varied to let the
dominant harmonic frequency of inverter output be constant, wherein the
frequency can easily be changed by tuning the center frequency of the
notch filter. The gating signal of switches is not needed to be sensed
for making the proposed control. The constant-frequency control
performance yielded by the proposed controller is rather insensitive to
the system disturbances and the neutral voltage variation due to
isolated Y connection. Through applying the proposed PWM inverter,
satisfactory position control requirements can be achieved by properly
setting the dominant harmonic frequency according to the
electromechanical model of the positioning system
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