Conference Paper

High performance current regulator for a field-oriented controlled induction motor drive

Dept. of Electr. Eng., Seoul Nat. Univ.
DOI: 10.1109/IAS.1992.244349 Conference: Industry Applications Society Annual Meeting, 1992., Conference Record of the 1992 IEEE
Source: IEEE Xplore

ABSTRACT A novel strategy of current regulation of a field-oriented
controlled induction motor using a gate turn-off thyristor (GTO)
inverter is proposed which is based on multivariable state feedback
control with an integrator. The controller is designed by the pole
placement technique of multivariable system regulation theory.
Feedforward control is included in the control laws to improve transient
responses. For the full state feedback control, the rotor flux is
estimated with a reduced-order state observer. A good steady-state
performance is obtained by means of an integral compensation, and fast
transient response is also feasible since the required voltage is
directly calculated from the feedforward control. Space voltage vector
pulse width modulation is adopted as a switching strategy. A variable
modulation scheme is presented which is changed from three-phase to
two-phase modulation in the high modulation range, which gives lower
current ripple over the whole operating range

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