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Dynamic behavior of a 21-Level BTB-based power-flow controller under single-line-to-ground fault conditions
- Source :
- IEEE Transactions on Industry Applications. Sept-Oct, 2007, Vol. 43 Issue 5, p1379, 9 p.
- Publication Year :
- 2007
-
Abstract
- This paper deals with the dynamic behavior of a 21-level (line-to-line) back-to-back (BTB) system based on series connection of 16 converter cells under a single-line-to-ground (SLG) fault condition. The BTB system is an ac-dc-ac power conversion system intended for achieving asynchronous power-flow control between transmission networks. When the SLG fault happens, an imbalance in the supply voltage brings an amount of negative-sequence current to the BTB system. The negative-sequence current should be mitigated because it would result in an increased supply current and a dc-capacitor voltage fluctuation. This paper intends for reducing both the negative-sequence current and the dc-voltage fluctuation to acceptable levels. A laboratory system rated at 200 V and 20 kW confirms the validity of the reduction scheme. In addition, this paper addresses the issue of magnetic saturation in the 16 three-phase converter--transformers. Index Terms--Back-to-back (BTB) system, multilevel converter, negative-sequence current, power-flow control, single-line-to-ground (SLG) fault.
Details
- Language :
- English
- ISSN :
- 00939994
- Volume :
- 43
- Issue :
- 5
- Database :
- Gale General OneFile
- Journal :
- IEEE Transactions on Industry Applications
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.169592738