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Nearly Constant Switching Frequency Hysteresis Current Controller with Fast Online Computation of Boundary for a 2-Level Induction Motor Drive
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| Author(s) |
Anubrata Dey; K Mathew; K Gopakumar; Marian P. Kazmierkowski |
| Abstract |
A nearly constant switching frequency current hysteresis controller for a 2-level inverter fed induction motor drive is
proposed in this paper. The salient features of this controller are fast dynamics for the current, inherent protection against overloads and less switching frequency variation. The large variation of switching frequency as in the conventional hysteresis controller is avoided by defining a current-error boundary which is obtained from the current-error trajectory of the standard space vector PWM. The current-error boundary is computed at every sampling interval based on the induction machine parameters and from the estimated fundamental stator voltage. The stator currents are always monitored and when the current-error exceeds the boundary, voltage space vector is switched to reduce the current-error. The proposed boundary computation algorithm is applicable in linear and over-modulation region and it is simple to implement
in any standard digital signal processor. Detailed experimental verification is done using a 7.5 kW induction motor
and the results are given to show the performance of the drive at various operating conditions and validate the proposed advantages. |
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| Filename: | Unnamed file |
| Filesize: | 581.6 KB |
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| Type |
Members Only |
| Date |
Last modified 2014-02-27 by System |
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