A suppression strategy for DFIG subsynchronous oscillation based on broadband rotor additional damping
DOI：10.7667/PSPC170099
Key Words:subsynchronous oscillation  broadband  additional damping control  series compensation  grid-connected impedance
Author NameAffiliation
ZHU Ling NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211000, China 
XU Xiang School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China 
HOU Yuqiang NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211000, China 
NIU Shuanbao Northwest Division of State Grid Corporation of China, Xi’an 710048, China 
LI Wei NARI Group Corporation State Grid Electric Power Research Institute, Nanjing 211000, China 
KE Xianbo Northwest Division of State Grid Corporation of China, Xi’an 710048, China 
WEI Ping Northwest Division of State Grid Corporation of China, Xi’an 710048, China 
CHANG Xiqiang Xinjiang Electric Power Company Dispatching and Communication Center, Urumqi 830002, China 
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Abstract:This paper studies the problem of the synchronous oscillation caused by Doubly Fed Induction Generator (DFIG) grid connection, and sets up equivalent model of DFIG motor and converter. Based on dynamic equivalent impedance analytic expression, the key factors of grid-connected impedance characteristics are analyzed. The results show that the internal loop gain of the controller rotor side has a large effect on the impedance characteristics of subsynchronous frequency band. On this basis, the paper puts forward a subsynchronous oscillation suppression method based on broadband rotor additional damping control. The proposed method is implemented on converter control of DFIG rotor side, without additional device and good for engineering application. Finally, the validity and applicability under transient condition of the suppression strategy are verified by time-domain simulation.
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