Open AccessVoltage source control of offshore all‐DC wind farm
Author(s) -
Yang Renxin,
Shi Gang,
Cai Xu,
Zhang Xiaoping
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.9292
Subject(s) - offshore wind power , grid , transformer , automatic frequency control , control theory (sociology) , inertia , computer science , frequency grid , marine engineering , electrical impedance , environmental science , voltage , wind power , electrical engineering , control (management) , engineering , geology , physics , geodesy , classical mechanics , artificial intelligence
The fast growth of offshore all‐DC wind farm will bring problems such as the weakening of grid frequency stability and the increase of equivalent grid impedance. To overcome this, a coordination control strategy for offshore all‐DC wind farm is proposed in this study with two salient features: better performance under weak grid condition, and real‐time frequency support from wind farm. This strategy consists of three parts: the inertia synchronising control of receiving end converter, the constant ratio control of DC transformer and the frequency response of wind farm. With the proposed strategy, the all‐DC wind farm operates like a synchronous generator to onshore grid, which provides fast frequency support when the onshore grid frequency changes. The effectiveness of the proposed method is validated in PSCAD/EMTDC.