Open AccessControllable powers range and control method of DFIG for transient stability of power system
Author(s) -
Zheng Di,
Ouyang Jinxin,
Xiong Xiaofu
Publication year - 2017
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2017.0605
Subject(s) - transient (computer programming) , control theory (sociology) , electric power system , rotor (electric) , low voltage ride through , induction generator , ac power , power (physics) , fault (geology) , doubly fed electric machine , wind power , grid , voltage , computer science , engineering , control (management) , electrical engineering , physics , mathematics , quantum mechanics , artificial intelligence , seismology , geology , geometry , operating system
Wind generation is increasing rapidly in the grid, which has greater impacts on the power system than ever. The impacts are more serious under grid fault. The low‐voltage ride through (LVRT) controls of doubly fed induction generators (DFIGs) may change characteristics of synchronous generators (SGs) and threaten the transient stability of power system. However, the influence on the transient stability and even the controllable powers of a DFIG has not been considered in the existing LVRT method. The contributions of the reactive power supplied by a DFIG in the oscillation process of power angle of SG were analysed. The controllable range of powers of a DFIG was researched with consideration of the rotor speed limit. An LVRT control method of a DFIG based on the controllable range was proposed to improve the transient stability of power system. Simulations show that the proposed method could enhance the power angle stability of power system under the condition of avoiding overspeed and out of service of DFIG.