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REALIZATION OF A HIGH-DYNAMIC DISCRETE-TIME CONTROLLER FOR PWM INVERTER-FED INDUCTION MOTOR DRIVES
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| Author(s) |
J. Böcker; J. Janning; K. Anbuhl |
| Abstract |
This paper describes a controller of a PWM inverter-fed induction motor drive based on the well known principle of rotor flux orientation. A new aspect is the homogeneous discrete-time design of the complete control structure including measurement data acquisition and pulse width modulation. A discrete-time flux observer ensures accurate flux orientation even at standstill and additionally supplies one-step-ahead predicted current estimates, which compensates for computational delay. By these discrete-time considerations computing power can be saved whereas optimal control performance can be reached. This control structure covers very different requirements of practical interest as smooth slow motion and operation at standstill as well as operations in the range of high flux weakening (up to ratios of 1:3 ... 5 or more). In constant-flux range torque response times of about 5 ms are reached. Even at a flux weakening ratio of up to 1:3.5 a torque response time of 15 ... 20 ms was measured. The controller bas been successfully proved in several drives up to a power of 960 kW. In all operation modes the control characteristics are comparable with those of DC drives. |
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| Filename: | Unnamed file |
| Filesize: | 2.716 MB |
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| Type |
Members Only |
| Date |
Last modified 2019-05-08 by System |
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