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This paper presents a detailed comparison between two voltage source converter high-voltage dc transmission systems. The first is based on the neutral point-clamped converter (also known as HVDC-Light) and the second is based on a modular multilevel converter (known as HVDC-Plus). The comparison focuses on reliability issues of both technologies, such as, fault ride-through capability and control...
A multi-terminal DC (MTDC) transmission system based on an innovative modular multilevel converter (MMC) is presented as a feasible approach to address the concerns regarding reliability and fault ride through capability of multi-terminal dc systems. Furthermore, MTDC using MMC may reduce construction costs and power losses in the converter stations. To demonstrate control flexibility, improved reliability...
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