Modelling and control of modular multi-level converter based HVDC systems using symmetrical components

Author

Yuanze Zhang ; Ravishankar, Jayashri ; Rui Li

Author_Institution

Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales, Sydney, NSW, Australia

fYear

2015

fDate

10-13 June 2015

Firstpage

1910

Lastpage

1915

Abstract

This paper studies the use of modular multi-level converter (MMC) in a HVDC transmission system. MMC, thanks to its robustness and high current quality and flexibility, has been widely used in HVDC transmission applications. However not many work is devoted to the area of MMC based HVDC system under unbalanced grid condition. This paper investigates a point to point MMC-HVDC system characteristics under unbalanced AC conditions. A model of a MMC converter is built under unbalanced conditions. Based on this model a control method, which controls positive- negative- and zero-sequence current components independently is proposed. A simulation case study is conducted to test the performance of the proposed controller.

Keywords

HVDC power transmission; power convertors; power grids; power transmission control; HVDC transmission system; modular multilevel converter control; negative-sequence current components; point to point MMC-HVDC system; positive-sequence current components; symmetrical components; unbalanced AC conditions; unbalanced grid condition; zero-sequence current components; Capacitors; Current control; HVDC transmission; Integrated circuit modeling; Mathematical model; Power conversion; HVDC transmission; Modular multi-level converter; System Modelling; Unbalanced grid;

fLanguage

English

Publisher

ieee

Conference_Titel

Environment and Electrical Engineering (EEEIC), 2015 IEEE 15th International Conference on

Conference_Location

Rome

Print_ISBN

978-1-4799-7992-9

Type

conf

DOI

10.1109/EEEIC.2015.7165464

Filename

7165464