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As HVDC based on voltage source converter (VSC) technology has already reached 350 kVdc voltage level, this paper examines the feasibility of connecting four voltage source converter (VSC) modules, each rated at 200 kVdc, in series to form a pole of UHVDC rated at 800 kVdc. Due to the series connection layouts, the individual DC bus voltage inequality exists when power reversal occurs. A detailed...
This paper investigates the operation principle, modeling, and control of a hexagonal converter for grid connected photovoltaic (PV) systems. The hexagonal converter is composed of six conventional two-level voltage source converters (VSCs) in which each VSC module are connected to a string of PV modules. The equivalent circuit model of the proposed topology is first detailed in the abc reference...
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