Title :
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
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;
Conference_Titel :
Environment and Electrical Engineering (EEEIC), 2015 IEEE 15th International Conference on
Conference_Location :
Rome
Print_ISBN :
978-1-4799-7992-9
DOI :
10.1109/EEEIC.2015.7165464
