Prototype of multiphase modular-multilevel-converter with 2 MW power rating and 17-level-output-voltage

Abstract

Fig. I Traction converter concept for the operation on the ISkVI16.7Hz and 2JkVISOHr wwer lines Abstracl-A versatile prototype converter system of the new Modular-Multilevel Converter (M'LC)family will be introduced. The new concept stands out due to its stringent modular eonstruction as well as its extremely good control eharacteristics. This new M'LC concept is well suitable for a wide range of high voltage applications. The basic working principle as well as the static and dynamic behaviour are explained in detail on a single-phase AClACsonverter enabling fourquadrant operation.The M'LC-family has already been introduced and examined for applications like traction converters, operating directly on the power line, and network interties 11-41. With this prototype converter system, the characteristics of various different M'LC-topologies can be investigated, including single or three phase DClAC converters as well as multiphase ACIAC converters.The prototype converter has been designed in such a way that its configuration can be quickly changed between a wide range o f topologies. A flexible control system has been implemented, which is capable of controlling up to 32 IGBTs per converter arm. independently. Next to the presentation of the converter and its control system, measurement results will be presented including converter operation. 07803-8399-0/041$20.W 020" IEEE.

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