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


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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    • "Thus the DTC scheme is a very simple structure requiring a pair of bang-bang controllers and a look-up table to select an adequate voltage vector to supply the induction machine. DTC is therefore simpler than the field oriented control (FOC) [3] [4], that needs PI controllers and PWM modulator. Furthermore, contrary to FOC, the DTC method is by principle a speed sensor less scheme. "
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    ABSTRACT: Fast and direct torque control (DTC) in a very wide range of speed is very needed by various industrial AC drive applications. The field control of induction motor is sensitive to machine parameters and some detuning is expressed in most rotor flux oriented control systems. Consequently, direct torque control has been introduced to reduce parameter sensitivity problems. The present work proposes a new approach of DTC and compares the obtained simulation results for different proposed approaches.
    Full-text · Article · Jan 2005
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    • "Therefore, feedforward signals for the reference and disturbance inputs are added to the feedback control law. Because the control algorithm guarantees the dynamically correct compensation for the EMF voltage, the performance of the state feedback controller is superior to conventional PI controllers [27], [28]. "
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    ABSTRACT: This paper presents a review of recently used current regulation techniques for voltage source pulse width modulated (VS-PWM) inverters. A variety of techniques, different in concept, are described as follows: on-off hysteresis free running and fixed frequency regulators (phase independent, look-up table based, space vector based); linear regulators (carrier based, working in stationary and rotating coordinates, PI and state feedback); predictive (minimum and constant switching frequency); and dead beat regulators. Also, recent trends in the current regulation-neural networks and fuzzy logic based regulators-are presented. Some oscillograms which illustrate the properties of the presented regulator groups are shown
    Full-text · Conference Paper · Oct 1994
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    • "Untuk mengoperasikan motor induksi pada putaran yang variabel, diperlukan sebuah inverter, yaitu peralatan pencatu tegangan yang frekuensi keluarannya dapat diatur. Inverter dengan teknik Pulse Width Modulation (PWM) banyak digunakan untuk berbagai keperluan di industri misalnya untuk uninterruptible power supply (UPS) [1], [2] dan pengendali motor induksi [7], [8]. Teknik switching PWM adalah teknik mendapatkan lebar pulsa yang proporsional dengan magnitudo sinyal sinusoida. "
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    ABSTRACT: Abstrak; Paper ini menyajikan teknik pemodelan impedansi bocor pada motor induksi akibat penggunaan inverter Pulse Width Modulation (PWM). Tegangan output inverter yang mengandung harmonisa dengan frekuensi tinggi menyebabkan timbulnya arus listrik yang mengalir melalui bearing menuju ke frame. Hal ini menyebabkan percepatan kerusakan bearing. Pemodelan, analisis dan simulasi arus bocor motor induksi telah dilaksanakan dengan menggunakan 3 komponen utama yaitu kapasitansi antara belitan stator-frame, belitan stator-rotor dan rotor-frame. Besar arus bearing merupakan 27.7% dari total arus yang terakumulasi pada frame. Sekitar 72.2% merupakan arus bocor yang mengalir dari belitan stator menuju ke frame motor dan sisanya adalah arus bocor dari rotor ke frame.
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