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access icon openaccess UUDAT based on the modular multilevel converter and diode bridges for high-voltage DC application

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 23/08/2018, Accepted 10/10/2018, Published 23/10/2018

Conventional unidirectional DC/DC converters for high-voltage direct current application employ DC/AC/DC technology and suffer from high converter cost and power loss. To solve these issues, a unidirectional step-up DC–DC autotransformer (UUDAT) is studied. UUDAT is composed of the series connection of diode bridges and voltage source converters. Topologies of UUDAT is detailed. The harmonic and uncontrollability issues are discussed. Control and the possible application scenario for UUDAT are proposed. The ways of dimensioning the voltage and power rating of the components in UUDAT are studied. Extensive simulations on the power system level verified the technical feasibility of UUDATs.

Inspec keywords: voltage-source convertors; DC-DC power convertors; autotransformers

Other keywords: DC/AC/DC technology; diode bridges; UUDAT; power loss; voltage source converters; high converter cost; modular multilevel converter; high-voltage direct current application; unidirectional step-up DC–DC autotransformer; power rating; high-voltage DC application; possible application scenario; conventional unidirectional DC/DC converters

Subjects: Control of electric power systems; DC-DC power convertors; Transformers and reactors

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