Design and fault-operation analysis of a modular cyclic cascade inter-cell transformer (ICT) for parallel multicell converters

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• 作者：S. Sanchez ; ^{sebastien.sanchez@laplace.univ-tlse.fr" class="auth_mail" title="E-mail the corresponding author} ; F. Richardeau ; D. Risaletto
• 关键词：Multicell converter ; InterCell Transformer (ICT) ; Coupled inductors ; Fault-operation ; Robustness
• 刊名：Mathematics and Computers in Simulation
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：131
• 期：Complete
• 页码：190-199
• 全文大小：2403 K

文摘

Nowadays, parallel multicell converters including inter cell transformers (ICTs) are usually used in many different conversion systems and with various topologies. In this paper, an analysis of a modular cyclic cascade ICT is presented for nominal and fault operation. The first part of the article presents a pre-design methodology for cyclic cascade ICTs in nominal operation. Afterwards, an analysis of magnetic behaviour during failure operation as imbalance current or case of k$k$ disconnected phases will be presented. The aim of this article is to design a cyclic-cascade ICT that is more robust in failure operation. Air gaps (AGs) have been inserted in order to limit this saturation. A concept of compact cyclic-cascade ICT with just a single winding by phase is presented. We will show its principle of realization and 2D fine element simulation in order to validate this concept.