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Fundamental changes are affecting the power transmission industry. Markets are being deregulated and liberalized, urbanization is continuing around the world accompanied by a constantly growing demand for energy and renewable energy sources are playing an increasingly important role. For these reasons, new and efficient solutions for power transmission are required. This paper will present the prospects and technology issues of the latest developments in Voltage-Sourced Converters (VSC) for advanced power transmission systems. A new technology Modular Multilevel Converters (MMC) will be described and all the benefits of the VSC for transmission systems enhancement will be highlighted.