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This paper investigates DC network partition and alternative DC fault protection strategy for Multi-terminal HVDC (MTDC) system. Fast acting DC Circuit Breakers (DCCBs) or fault blocking DC-DC converters can be configured at strategic locations to allow the entire MTDC system to be operated interconnected but partitioned into islanded DC network zones following faults. In case of any DC fault event,...
A flying capacitor based n-level non-isolated DC-DC converter is researched in this paper. The converter features reduced flying capacitors, compact structure, adjustable output voltage and high-voltage high-power ability. Basic operating principle was analyzed and a mean value model is derived. A dual-loop capacitor voltage balancing method for n-level structure is proposed. A seven-level prototype...
This paper describes the role of voltage source converter (VSC) based, multi-terminal HVDC (MTDC) transmission systems for integrating large offshore wind farms, and for providing dynamic frequency regulation and power oscillation damping to the connected onshore transmission networks. In this paper, offshore converter station and DC cable configuration are brief discussed and main requirements for...
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