Journal
INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY SYSTEMS
Volume 24, Issue 7, Pages 1017-1033Publisher
WILEY
DOI: 10.1002/etep.1757
Keywords
alternate arm multilevel converter; HVDC; overlap square-wave modulation; DC fault; capacitor voltage balancing
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A new alternate arm multilevel converter composed of direction switch (DS) and cascaded H-bridge (CHB) with direct current (DC) fault blocking capability is presented. First, the topology and operation principles of the converter are introduced. Second, an overlap square modulation scheme for the DS is proposed to keep energy balance, then the nearest level modulation (NLM) is applied to the CHB, and a new capacitor voltages balancing strategy of sub-module in CHB is proposed. Third, blocking mode and multiple static synchronous compensator modes of the converter under DC fault condition are analyzed. Finally, the effectiveness of the modulation strategies and DC fault ride-through capability for the new alternate arm multilevel converter-based voltage direct current system is verified by PSCAD (R)/EMTDC (Manitoba HVDC Research Centre, Manitoba, Canada) simulations. Copyright (C) 2013 John Wiley & Sons, Ltd.
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