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access icon openaccess Reactive power optimisation design and fault ride through of MMC-PLUS

  • Author(s): Zhihan Yang 1 ; Wang Xiang 1 ; Liangzhong Yao 2 ; Zhibing Wang 2 ; Jinyu Wen 1
    • View affiliations
  • Source: Volume 2017, Issue 13, 2017, p. 806 – 811
    DOI:  10.1049/joe.2017.0442 , Online ISSN 2051-3305
This is an open access article published by the IET under the Creative Commons Attribution-NoDerivs License (http://creativecommons.org/licenses/by-nd/3.0/)
Received 06/10/2017, Accepted 02/11/2017, Published 01/01/2017

To integrate bulk wind power, a modular multilevel converter (MMC)-PLUS composed of the series connection of line commutated converter (LCC) and MMC is investigated. The system combines the advantages of LCC and MMC, such as high power, high voltage, self-commutating and direct current (DC) fault blocking capability. However, due to the coupled control of active power and reactive power, much reactive power should be compensated during the operation of LCC. The study makes a detailed analysis and optimisation of reactive power compensation devices taking into account the PQ operation curve of MMC and making full use of the capacity of MMC. In addition, further studies the control strategy of DC fault isolation and system restart under DC fault. The effectiveness of the reactive power configuration and DC fault strategy is verified by simulations in PSCAD/EMTDC.

Inspec keywords: HVDC power convertors; reactive power control; fault diagnosis; power transmission faults; optimisation; power transmission control; wind power plants; voltage-source convertors

Other keywords: LCC; line commutated converter series connection; reactive power coupled control; MMC-PLUS; MMC PQ operation curve; fault ride through; DC fault isolation control strategy; modular multilevel converter-PLUS; bulk wind power integration; active power coupled control; PSCAD/EMTDC; DC fault strategy; reactive power compensation device optimisation

Subjects: Optimisation techniques; Control of electric power systems; d.c. transmission; AC-DC power convertors (rectifiers); Power and energy control; Wind power plants; Optimisation techniques; DC-AC power convertors (invertors)

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