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Energy-Based Modulation Error Control for High-Power Drives with Output LC-Filters and Synchronous Optimal Pulse Width Modulation
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| Author(s) |
Tomasz Laczynski, Timur Werner and Axel Mertens |
| Abstract |
In order to reduce the switching frequencies of power semiconductors, synchronous optimal pulse width modulation provides an appropriate solution. The switching angles result from complex offline calculations, assuming steady-state operation. Medium voltage drives when applied to the retrofit of existing fixed speed induction motors often include an output LC-filter which introduces a resonant circuit. Therefore, only in steady-state operations the combination of a high-power drive with a LC-filter and optimized pulse width modulation delivers satisfactory behavior. Changes in operating conditions cause weakly damped electrical oscillations, which can be described as dynamic modulation errors. In this paper, a novel energy-based control method is proposed, in order to damp the LC-filter excitation without increasing the switching frequency. The introduced control technique has been verified by simulations of a 2.4 kV induction motor drive. |
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| Filename: | 392.pdf |
| Filesize: | 354.5 KB |
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| Type |
Members Only |
| Date |
Last modified 2008-12-07 by System |
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