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In recent years, significant progress has been made in HVDC transmission by the advent of voltage-source-converter (VSC) technology using modular multilevel converters. There is increasing demand to interconnect the existing HVDC lines into meshed HVDC grids for better renewable energy penetration. In this paper, a series of power electronic topologies, all based on the front-to-front VSC structure,...
The use of HVDC power systems for transferring electrical energy across large distances is growing as the mix of energy sources, including renewables, feeding our utility grids evolves. This presentation will consider the range of Power Converter topologies that can be used for these HVDC applications and will look at the advantages and disadvantages of a range of topologies in these applications...
A Power Electronic Transformer (PET) performs the tasks of a conventional transformer by means of power electronic converters and medium-frequency transformers. A three-stage PET has high- and low-voltage AC and low-voltage DC output terminals. In this work, employing a Modular Multilevel Converter (MMC) at the first stage of a three-stage topology, a PET configuration is proposed, which not only...
A number of topologies have been introduced for Solid State Transformer (SST); each has its own pros and cons. The three-stage topology, employing a multilevel converter as the first stage, is the most commonly adopted topology in the recent literature. In this paper, a three-stage SST topology is proposed which employs modular multilevel converters in both the first and second stages. The proposed...
The ever increasing process of high-voltage high-power fully controlled semiconductor technology has promoted the flexible ac transmission systems ahead significantly. Developments advance both the HVDC power transmission and the flexible ac transmission system technologies. In this paper, an overview of HVDC power transmission systems is provided. Recent advanced technology in this area is presented...
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