Abstract
Within the framework of modernisation of the European electricity grid, multi-terminal high-voltage direct current (HVDC) offshore grids shall be integrated into future transmission systems. An essential aspect of multi-terminal HVDC systems is fast and selective DC-side fault handling and the separation of faulty lines. This study investigates the applicability of different control methods relying on full-bridge-based converters in combination with high-speed switches for a fast and selective separation of faulty line segments in a multi-terminal HVDC cable system in a symmetrical monopole configuration. It is shown that the proposed line current control method can significantly reduce the separation time of a faulty line compared with standard fault control methods. The analysis is based on simulations in PSCAD|EMTDC ™ with a converter model based on the CIGRE WG B4.57, which is enhanced for the use of full-bridge converters with fault current control schemes.
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