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Real-Time Testing of WPT-Based Protection of Three-Phase VS PWM Inverter-Fed Motors.
- Source :
-
IEEE Transactions on Power Delivery . Oct2007, Vol. 22 Issue 4, p2108-2115. 7p. 3 Black and White Photographs, 1 Diagram, 15 Graphs. - Publication Year :
- 2007
-
Abstract
- This paper presents an experimental testing of a wavelet packet transform (WPT)-based technique for protecting and controlling three-phase voltage-source (VS) pulse-width modulated (PWM) inverters under extreme load conditions. The proposed technique is based on a two-level multiresolution analysis (MRA) applied on output currents of a 3Ø VS PWM inverter. The MRA aims to extract certain signatures, which are the second level highest frequency subband coefficients. These coefficients take a nonzero value for any signal that is short-duration, nonperiodic and nonstationary with impulse-super imposed high frequencies. Such a signal perfectly matches a current arising from any typical fault occurring in either the inverter legs or on the load side. The proposed technique is realized using a C-code hosted and executed by a dSPACE ds1102 controller board. The tested inverter supplies loads that include a 3Ø Y-connected R — L load, a 34 squirrel-cage induction motor and a 3Ø synchronous reluctance motor. The extreme load conditions include inverter open-leg, motor starting currents and different faults in motor stator windings. The experimental test results show accurate, fast, and effective response to all disturbances including fault currents by the proposed WPT-based technique. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 08858977
- Volume :
- 22
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Power Delivery
- Publication Type :
- Academic Journal
- Accession number :
- 27574176
- Full Text :
- https://doi.org/10.1109/TPWRD.2007.905559