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Dynamic Behavior of a 21-Level BTB-Based Power-Flow Controller Under Single-Line-to-Ground Fault Conditions

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4 Author(s)
Hagiwara, M. ; Tokyo Inst. of Technol., Tokyo ; Wada, K. ; Fujita, H. ; Akagi, H.

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.

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Industry Applications, IEEE Transactions on  (Volume:43 ,  Issue: 5 )