Open AccessStudy on the reactive power coordinated control in hybrid parallel HVDC system
Author(s) -
Yang Han,
Rui Song,
Xuan Wang,
Shichang Zhao,
Wei Yang,
Min Luo
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/853/1/012020
Subject(s) - ac power , hvdc converter , hvdc converter station , fault (geology) , commutation , electric power system , high voltage direct current , power (physics) , volt ampere reactive , control theory (sociology) , grid , voltage , power control , engineering , computer science , direct current , control (management) , voltage optimisation , electrical engineering , physics , mathematics , geometry , quantum mechanics , artificial intelligence , seismology , geology , transformer
Hybrid parallel HVDC system adopts line commutated converter high voltage direct current(LCC-HVDC) and voltage source converter high voltage direct current(MMC-HVDC) parallel structure, which combines the advantages of LCC-HVDC and MMC-HVDC. Based on the existing reactive power control of HVDC system, the reactive power coordination control strategy of hybrid parallel HVDC system is innovatively proposed in this paper. Firstly, the reactive power control of LCC-HVDC and MMC-HVDC are studied respectively. And then the voltage stability of LCC-HVDC fed weak AC system is analyzed. Furthermore, a reactive power coordination control strategy between reactive power compensation device of the converter station and MMC-HVDC is proposed. Finally, based on PSCAD/EMTDC simulation platform, a hybrid parallel HVDC simulation system is built. The reactive power coordination control strategy under steady and transient conditions is simulated and analyzed respectively. The analysis results show that the reactive power coordinated control strategy can suppress the voltage fluctuation of converter bus in steady state. At the same time, the reactive power coordinated control strategy can restrain the commutation failure of LCC-HVDC in the fault of receiving power grid and improve its fault recovery ability.