Fault tolerant operation of the Modular High Frequency Converter

Fault tolerance of converters and drive systems is becoming a key issue for many future applications. The Modular High Frequency Converter (MHF) is a new inverter topology, especially designed for applications, where high reliability and ultra-light weight are important. Besides superior dynamic behavior, continuous operation after defects is one of the main advantages of the Modular High Frequency Converter. Considering fault tolerant operation, different failure scenarios and possible countermeasures are analyzed in this paper. A new control concept, supporting the capability of fault tolerant operation is introduced. Simulation and operating results of the first laboratory prototype prove the fault ride through capability of the presented topology.