Four-Level MMC Cell Type with DC Fault Blocking Capability for HVDC
Conference: PCIM Europe 2017 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
05/16/2017 - 05/18/2017 at Nürnberg, Deutschland
Proceedings: PCIM Europe 2017
Pages: 9Language: englishTyp: PDF
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Authors:
Hofmann, Viktor; Bakran, Mark M. (University of Bayreuth, Germany)
Abstract:
The Modular Multilevel Converter (MMC) is a well-suited converter topology for high-voltage direct current (HVDC) transmission. This converter is assembled with a large amount of in series connected cells, such as the half bridge, full bridge or clamp double cell type. In this paper, a four-level MMC cell type with a DC fault blocking capability is presented and its functional principle is described. Furthermore, a detailed analysis on different cell types is performed. The semiconductor losses are calculated in combination with an evaluation of the junction temperature by means of a proven thermal model. Thus, the maximum thermal admissible current and consequently the power transmission capability of each cell type is derived. Finally, a comparison of the different cell types with regard to the utilization of the installed switching power, the efficiency and power transmission capability is presented.