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PARAMETER ADAPTATION FOR A FIELD ORIENTED INDUCTION MACHINE FED BY A PWM-INVERTER AND DETERMINATION OF THE FUNDAMENTAL CURRENTS IN THE RANGE OF OVERMODULATION
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| Author(s) |
J. Fetz |
| Abstract |
This paper presents a new method for on-line adaptation of the parameters of an induction machine fed by a voltage source inverter. A field oriented feed forward control with optional closed loop error control transfers amplitude and angular velocity of the reference voltage vector to a subordinated PWM-modulator, which is working in synchronized sinusoidal and optimized modulation mode. Algorithms for on-line parameter adaptation in steady state machine operation are derived for both field oriented control modes. For the range of optimized modulation a new method is presented to determine the fundamental current waveform by subtracting precalculated current harmonics from sampled phase currents. The entire control which includes PWM-modulator, parameter adaptation and fundamental current calculation is performed by a single 16 bit microcomputer. Simulation results and measurements on a 30 kW test drive document the obtained results. |
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| Filename: | Unnamed file |
| Filesize: | 3.649 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-08-02 by System |
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