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In a HVDC transmission system, faults occur in the AC system can result in the variation of impedance-frequency characteristic of the HVDC converter. In this paper, an advanced switching function model of HVDC converter, which considers the effect of the interactions between the AC and DC system and the unbalanced operating conditions of the converter, is presented. Based on this model, a method for...
This paper presents a modeling technique to the HVDC converter under asymmetric conditions using the dynamic phasor. A detailed analysis of the dynamic processes of HVDC converter when asymmetric faults occur in the ac system, including variation of switching instants and unbalanced commutation overlaps is presented. Based on which, an advanced dynamic phasors model for HVDC converters is proposed,...
This paper presents the basic structure parameters of 800 kV DC composite insulator specimen and the pollution test scheme under whole voltage and whole structure dimension. The condition of 800 kV DC composite insulator pollution test under whole 800 kV voltage and whole structure dimension completed in STRI, which is completed first time in the world, is introduced. The study results indicate that...
This paper introduces the facing technical challenges and up to date research achievement of ?? 800 kV UHVDC transmission technology in China. The insulation coordination technology, external insulation technology, internal insulation technology and development of major ?? 800 kV UHVDC equipments are introduced emphatically. Most of these research items to be done are the first time in the world....
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