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Diode-clamped multilevel voltage source converter for medium voltage dynamic voltage restorer

This paper proposes multilevel voltage source converter based medium voltage dynamic voltage restorer. Three multilevel voltage source converters, namely diode-clamped, flying capacitor and cascaded H-bridge are compared. These topologies are well suited for high-power, high-voltage level and low harmonic. This paper also discusses the development of power semiconductors, modulation scheme and methodology to control the dynamic voltage restorer. These multilevel converters can feed power into distribution system with only one dc-link energy storage. The design of passive components of LC output filter, modulation strategies and control of dynamic voltage restorer are also presented. Simulation results show performance of dynamic voltage restorer and verify the validity of the proposed topology of diode-clamped multilevel voltage source converter for medium voltage dynamic voltage restorer.