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As the key equipment of ultra-high-voltage direct-current (UHVDC) transmission systems, the converter valve would bear different forms of overvoltage. Consequently, a wideband model for the $\pm $1100 kV UHVDC converter valve is essential for the converter system to make overvoltage analysis, insulation design, and electromagnetic disturbance prediction. This paper proposed a wideband modeling method...
Capacitance parameter extraction of converter system is crucial to analyze the voltage distribution of valve tower under different overvoltages (such as lightening, partial discharge, etc) in HVDC converter station. According to the actual dimension of valves, the Method of Moments(MOM) based on the point matching method is applied to extract the capacitances, including the self-capacitances and the...
Thyristor valves are the core components in HVDC transmission system. These valves in the system are exposed to various overvoltages both external and internal. So it is important to analyze the characteristic of the converter valves under different overvoltages. Wide-band equivalent circuits of the valve components such as thyristor, saturable reactor are obtained based on impedance measurement....
Conducted electromagnetic interference (EMI) due to the operation of HVDC converter station is caused by the processes during ignition and extinction of the thyristors in the converter valves. A method is developed in this paper for calculating the EMI level of the 12-pulse plusmn500 kV converter stations. In this method, the main equipments of the converter station are modeled and connected. The...
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