Open AccessCoordinated control of MMC‐HVDC system with offshore wind farm for providing emulated inertia support
Author(s) -
Zeng Xueyang,
Liu Tianqi,
Wang Shunliang,
Dong Yuqing,
Li Baohong,
Chen Zhe
Publication year - 2020
Publication title -
iet renewable power generation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.005
H-Index - 76
ISSN - 1752-1424
DOI - 10.1049/iet-rpg.2019.0505
Subject(s) - offshore wind power , capacitor , engineering , inertia , modular design , transmission system , electric power system , wind power , electrical engineering , high voltage direct current , renewable energy , ac power , power (physics) , control theory (sociology) , computer science , transmission (telecommunications) , voltage , control (management) , direct current , physics , classical mechanics , quantum mechanics , artificial intelligence , operating system
With the continuous increase of renewable energy generation and high voltage direct current (HVDC) power transmission, the system inertia is declining, thus resulting in greater risks of frequency instability. To solve this issue, a dc‐link inertia control is firstly proposed for a point‐to‐point modular multilevel converter based HVDC (MMC‐HVDC) link, which enables the MMC‐HVDC system to provide emulated inertia support by employing the electrostatic energy stored in the dc capacitors. Moreover, in order to maintain reasonable submodule capacitor size as well as provide more emulated inertia support, a virtual capacitor control for MMC‐HVDC connected an offshore wind farm (OWF) is proposed. With the virtual capacitor control, the OWF is able to provide a large capacity virtual capacitor in dc side of MMC‐HVDC link and supply desired emulated inertia support for onshore power system by utilising the offshore wind turbines’ rotor rotational kinetic energy. Furthermore, a procedure for selecting the appropriate virtual capacitor control parameters is proposed. Finally, the performance of the proposed coordinated control is researched in PSCAD/EMTDC, and the simulation results show that the onshore power system inertia is effectively improved with the coordinated control.