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Subtransmission and distribution systems for large cities are usually built up of underground cable systems of considerable length. With regards to both cost and performance, a multiterminal HVDC system might be an interesting alternative of the conventional HVAC system. The performances of such a multiterminal system have been studied. The simulation results have shown that great improvement might be offered by the introduction of such a multiterminal HVDC system especially with regard to the power quality and earth fault disturbances in the system.
Jiang et al. (Thu,) studied this question.