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access icon openaccess Fault blocking converters for HVDC transmission: a transient behaviour comparison

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 22/06/2018, Accepted 30/07/2018, Published 22/01/2019

A thorough comparison of the transient behaviours of two state-of-the-art converters suitable for HVDC transmission is presented. The alternate arm and mixed-cell modular multilevel converter topologies both have DC fault blocking capability and are selected for the comparison. Converter performance is evaluated and compared under various transient conditions including charging sequence, unbalanced operation, and DC fault recovery. The study is conducted using high-fidelity converter simulation models, integrating detailed controllers that reflect real-scale projects. The main findings of the study assist in the selection of the most suitable converter, given specific performance specifications such as capacitor voltage ripple, cell capacitor requirements, and response during transient operation.

Inspec keywords: capacitors; power convertors; HVDC power convertors; switching convertors; HVDC power transmission

Other keywords: transient behaviours; state-of-the-art converters; suitable converter; transient behaviour comparison; high-fidelity converter simulation models; alternate arm; HVDC transmission; transient operation; DC fault blocking capability; unbalanced operation; given specific performance specifications; DC fault recovery; transient conditions including charging sequence; cell capacitor requirements; mixed-cell modular multilevel converter topologies; converter performance

Subjects: Power electronics, supply and supervisory circuits; Control of electric power systems; Power convertors and power supplies to apparatus; d.c. transmission; Capacitors

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