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Implications of resonant circuit adjustment errors to the DC-link voltage in single-phase 16.7-Hz-railway applications

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5 Author(s)
Heising, C. ; Ruhr-Univ. of Bochum, Bochum, Germany ; Oettmeier, M. ; Gorski, M. ; Staudt, V.
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Traction vehicles operating in the single-phase 16.7-Hz-railway grid-typical for central Europe - employ a resonant circuit connected in parallel to the DC-link capacitor. The resonant circuit is necessary to take up the unavoidable grid power pulsation with double frequency, leaving a smooth DC-link voltage. In reality grid-voltage frequency and resonance frequency of the resonant circuit do not fit accurately: Manufacturing tolerances of resonant-circuit capacitor and inductance lead to an adjustment error and the railway-grid frequency moves within a defined interval, due to the power-frequency control, independent from the European interconnected mains. In this paper implications of the adjustment error are analysed. Additionally instructions for parameter identification are given and backed by measurement results.

Published in:

Compatibility and Power Electronics, 2009. CPE '09.

Date of Conference:

20-22 May 2009

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