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 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.