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Low-voltage DC (LVDC) systems offer a promising means for improving distribution system efficiency and reliability. The DC-AC conversion stage, however, is one of the main challenges for LVDC networks. A low-voltage modular multilevel converter (MMC) for LVDC distribution systems is proposed in this paper. Analysis is presented to show that its efficiency can exceed that of a conventional 2-level...
Power converters are crucial components of the wind turbine generator system (WTGS), and the reliability of wind power converters is susceptible to power fluctuations of the WTGS. The accurate lifetime estimation of power semiconductors should consider the long-time mission profiles of the WTGS. However, the existing junction temperature calculation methods don't meet the requirement for performance...
Multilevel inverters are increasingly being used due to their superior performance compared to two-level inverters. Different circuit topologies on multilevel inverters have been extensively researched. Conduction and switching losses of IGBT in multilevel inverter is the key factor which could influence the converter reliability and efficiency. In this paper, thermal evaluation is described for four...
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