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STATCOM Operation under Single Line-Ground System Faults with Magnetic Saturation in Series Connected Transformers based 48-pulse Voltage-Source Convert
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| Author(s) |
BHATTACHARYA Subhashish; XI Zhengping |
| Abstract |
In this paper, we investigate an "emergency PWM" method to prevent over-currents in VSC based STATCOM and control transformer magnetic saturation under single line-ground (SLG) power system faults. The 100MVA 48-pulse VSC topology is based on four series connected transformers on the primary side and each transformer secondary is connected to a 3 phase, 3-level Neutral Point Connected (NPC) VSC, with a common dc bus. A practical issue of impact of slightly different saturation (B-H) characteristics of series connected transformers, on VSC performance is investigated for SLG faults in the power system. The detailed simulation results for a 48-pulse GTO thyristor based VSC 100 MVA STATCOM connected to a 2-bus power system under SLG system faults validate that the proposed "emergency PWM" enables STATCOM operation under transformer saturation without over-currents in the GTO devices. The proposed "emergency PWM" strategy prevents STATCOM tripping under SLG power system faults. |
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| Filename: | 0778-epe2007-full-17561887.pdf |
| Filesize: | 2.462 MB |
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| Type |
Members Only |
| Date |
Last modified 2008-01-11 by System |
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