Open AccessLinear demagnetizing strategy of DFIG‐based WTs for improving LVRT responses
Author(s) -
Chang Yuanzhu,
Kong Xiangping
Publication year - 2017
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2017.0738
Subject(s) - doubly fed electric machine , control theory (sociology) , low voltage ride through , computer science , electrical engineering , voltage , engineering , ac power , control (management) , artificial intelligence
As doubly fed induction generator (DFIG)‐based wind turbines (WTs) have already become a significant power source in modern power systems, its dynamic performance under grid fault is ordered strictly by low‐voltage ride through (LVRT) grid codes, namely maintain grid‐connected and inject required current rapidly. In this study, LVRT responses of DFIG‐based WT, with different LVRT solutions, are analysed and evaluated by natural flux and its corresponding transient recovery period of control ability. Compared to exponential damping characteristics under traditional schemes, linear demagnetising strategy is proposed to realise the optimal damping characteristic in natural flux by making the most of current capacity in rotor‐side converter. As a result, LVRT responses are improved effectively, namely transient recovery time and oscillation of required current are decreased, to meet future grid codes. Finally, the superiority of proposed strategy is verified with an insulated gate bipolar transistor‐detailed simulation on a general electric (GE) 1.5 MW WT.