Diode-Clamped Multilevel Converter
A generalized method for the analysis of the different multilevel converters has been presented in Chapter 2. One topological derivation from this structure is the diode-clamped multilevel converter (DCMC), whose simplest version, the three-level neutral point clamped (NPC) converter, was introduced in 1981 by Nabae and coworkers [1]. Although the NPC converter has matured to significant industrial acceptance, DCMCs with more than three levels have been relegated to laboratory prototypes mainly due to the problem of DC bus voltage balance. However, its reduced number of capacitors, compared with other multilevel topologies, and its inherent suitability for back-to-back connection ...
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