access icon openaccess Coordinated control of power loss and capacitor voltage ripple reduction for AC voltage boosted FBSM MMC with second harmonic circulating current injection

This is an open access article published by the IET and CEPRI under the Creative Commons Attribution-NonCommercial-NoDerivs License (http://creativecommons.org/licenses/by-nc-nd/3.0/)
Received 10/06/2018, Accepted 28/09/2018, Revised 26/09/2018, Published 01/10/2018

Reducing the converter loss, sub-module voltage ripple and handling DC short-circuit faults in high-voltage direct current systems are crucial for the economical and reliable operation of modular multilevel converters (MMCs). This study proposes a coordinated control method of power loss reduction and capacitor voltage balancing for AC voltage boosted full-bridge sub-module (FBSM)-MMC by controlling the second harmonic component in the circulating current. The relationship between converter loss and second harmonic circulating current (SHCC) is firstly derived for AC voltage boosted FBSM-MMC. From the analysis, it can be seen that the converter loss and ripple can be optimised by injecting the SHCC into the arm current when compared with SHCC elimination. Simulation results of an AC voltage boosted FBSM-MMC with typical parameters using PSCAD/EMTDC confirm the feasibility and validity of the proposed loss and ripple reduction method.

Inspec keywords: power grids; HVDC power convertors; voltage control; electric current control; power capacitors

Other keywords: AC voltage boosted full-bridge sub-module; full-bridge sub-module-MMC; power loss reduction; high-voltage direct current systems; second harmonic circulating current injection; modular multilevel converters; sub-module voltage ripple; SHCC elimination; coordinated control method; FBSM MMC; converter loss; arm current; DC short-circuit; capacitor voltage ripple reduction

Subjects: Other power apparatus and electric machines; Current control; Control of electric power systems; AC-DC power convertors (rectifiers); Voltage control

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