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Balancing the DC Link at the 3-level PWM System-Tie Frequency Converter Gebersdorf (Nuremberg)
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| Author(s) |
Drogsler O., Pichler P., Weiss H. |
| Abstract |
3-level PWM systems offer high power capabilities at reasonable current ratings. A fully static system-tie frequency converter with 15 (respect. 18) MVA at 16 2/3 Hz started to operate for the German railways (DB) in Muldenstein in 1994 [1], in 1996 it has been transferred to Gebersdorf. As all of its 56 controlled semiconductors for power transfer are GTOs (active front end at the 50 Hz side) the balance between the positive and the negative DC-link voltage at this 3-level-system has to be maintained by proper firing control of the GTOs. In the short intermediate steps of the PWM voltage - when only the positive or the negative DC-link capacitor is in the current path - an unsymmetry of the DC-link may occur or can be corrected. This contribution describes the method of balancing the DC-link of a 3-level PWM with the given output currents at arbitrary phase shifts. |
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| Filename: | EPE-PEMC2000 - 267 - Drogsler.pdf |
| Filesize: | 458.1 KB |
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| Type |
Members Only |
| Date |
Last modified 2004-04-28 by System |
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