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Modeling and Evaluation of dv/dt Filters for ASD
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| Author(s) |
A. F. Moreira; T. A. Lipo; G. Venkataramanan; S. Bernet |
| Abstract |
Recent advances in power electronic switching device technology have resulted in dramatic
improvements and cost reduction of pulse-width modulated AC adjustable speed drives. Concomitant
with the better performance enabled by the high switching speed and increased switching frequency
they have also raised several concerns related to the consequences of high speed switching. One of
these concerns is the over-voltage that appears at the motor terminals due to the impedance mismatch
between the power cable and the motor. This paper develops accurate simulation models for power
cables and motors that allow a better understanding of the over-voltage problem. The models can be
readily implemented using computational tools like Matlab, thereby providing a convenient method to
develop the best dv/dt filter solution for a particular drive. The power cable is modeled using several
lumped-parameter segments of a lossy representation of transmission line. An algebraic analysis is
developed to choose an adequate number of lumped-parameter segments. The number of required
segment is function of the pulse rise time, cable characteristic parameters and cable length.
Simulation results are presented analyzing the over-voltage problem for a wide range of pulse rise
times and cable lengths for 1hp, 10hp and 100hp motors. The most important filter network solutions
are investigated using the simulation program and an optimized design is performed for the RC Filter
at the motor terminals. Experimental results verifying the validity of the model for the over-voltage
analysis are presented. |
| Download |
| Filename: | EPE2001 - PP00986 - Moreira.pdf |
| Filesize: | 199.2 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-03-10 by System |
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