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DC voltage control and power distribution are significant requirements for multi-terminal HVDC control system. The common voltage droop control has the drawback of failing to keep the dc voltage at a fixed value if active power is fluctuating, and voltage margin method actually controls dc voltage only by one converter at a time. A novel control strategy-Coordinated DC Voltage Control-is thus proposed...
This paper proposes a novel control strategy-Coordinated DC Voltage Control (CDVC)-to enhance the AC fault ride through capability of Multi-terminal HVDC system. It is able to keep DC voltage constant and distribute power fast and smoothly, independent on line impedance parameters. Combined with this original control strategy, a series of AC fault ride through methods, including voltage reduction,...
Based on a five-terminal HVDC system connected with offshore wind farms, this paper investigates a three-level control strategy for AC fault ride through, including voltage droop, power reduction and DC chopper control, in order to enhance the system ac fault ride through capability. The restrictions of individual control level are respectively investigated before a trigger mechanism of the three-level...
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