Abstract
This article presents a comparison between traditional rectifier current control and a proposed inverter current control for HVDC systems, considering both dynamic and functional steady-state aspects. The analytical system model, implemented in MATLAB, is used for the eigenvalue analysis and studies -based on the time domain performance index. It is shown that inverter current control has noticeable dynamic benefits, particularly for long cable DC systems and for weak inverter AC system configurations. Conventional rectifier current control is superior only with systems having very weak rectifier AC systems. Mode transition analysis fully confirms functionality of the inverter current control method but it also reveals particular new phenomena. A PSCAD simulation study with CIGRE benchmark model supplements salient results in this work.
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