Dynamic equivalent model of doubly fed wind farm during electromagnetic transient process

• Published in: IET renewable power generation Vol. 11; no. 1; pp. 100 - 106
• Main Authors: Jinxin, Ouyang, Yanbo, Diao, Di, Zheng, Rui, Yu, Xi, Zhang, Xiaofu, Xiong
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 01.01.2017
• Subjects: asynchronous generators; clustering method; Coherence; Computer simulation; Controllers; DFIG; doubly fed induction generator; doubly fed wind farm; dynamic equivalent model; Dynamical systems; electromagnetic transient analysis; electromagnetic transient process; envelope curve evaluation; Equivalence; feature information; grid fault; large‐scale applications; pattern clustering; power generation faults; power grids; power system; power system transients; Research Article; short‐circuit currents; Similarity; stator SCC; stator short‐circuit current; stators; structure similarity indices; Transient analysis; transient behaviour analysis; transient characteristics; transient state difference recognition; wind generation; Wind power; wind power plants; transient characteristics; doubly fed induction generator; clustering method; power system; wind generation; short-circuit currents; structure similarity indices; envelope curve evaluation; power generation faults; electromagnetic transient analysis; power grids; wind power plants; transient state difference recognition; stator short-circuit current; dynamic equivalent model; asynchronous generators; feature information; large-scale applications; stator SCC; power system transients; stators; pattern clustering; electromagnetic transient process; transient behaviour analysis; doubly fed wind farm; grid fault; DFIG
• ISSN: 1752-1416; 1752-1424; 1752-1424
• DOI: 10.1049/iet-rpg.2016.0284

The dynamic processes of a power system during grid fault are being changed by the large-scale applications of wind generation. The transient characteristics of a single doubly fed induction generator (DFIG) have been widely researched. However, the overall characteristics of a wind farm have not been obtained because the existing models of a wind farm cannot cover the differences caused by normal instruction values, controller responses, and protections of the DFIGs. The equivalent model of a doubly fed wind farm used for the electromagnetic transient analysis is studied. The feature information of the stator short-circuit current (SCC) of a DFIG was excavated based on transient behaviour analysis. The structure similarity indices are established to evaluate the envelope curves of the SCCs. A clustering method based on transient physical process is then proposed to distinguish coherent DFIGs. The equivalent model represented by a small number of DFIGs is obtained by aggregating coherent groups. The simulations indicate that the method effectively recognises transient state differences of the DFIGs. Thus, the model meets the requirements of the transient analysis.