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http://dx.doi.org/10.5370/JEET.2016.11.4.801

Damping for Wind Turbine Electrically Excited Synchronous Generators  

Tianyu, Wang (Dept. of Electrical Engineering, Shanghai Jiao Tong University)
Guojie, Li (Dept. of Electrical Engineering, Shanghai Jiao Tong University)
Yu, Zhang (Electric Power Research Institute, State Grid Shanghai Municipal Electric Power Company)
Chen, Fang (Electric Power Research Institute, State Grid Shanghai Municipal Electric Power Company)
Publication Information
Journal of Electrical Engineering and Technology / v.11, no.4, 2016 , pp. 801-809 More about this Journal
Abstract
The electrically excited synchronous generator (EESG) is applied in wind turbine systems recently. In an EESG control system, electrical torque is affected by stator flux and rotor current. So the control system is more complicated than that of the permanent-magnet synchronous generator (PMSG). Thus, the higher demanding of the control system is required especially in case of wind turbine mechanical resonance. In this paper, the mechanism of rotor speed resonant phenomenon is introduced from the viewpoint of mechanics firstly, and the characteristics of an effective damping torque are illustrated through system eigenvalues analysis. Considering the variables are tightly coupled, the four-order small signal equation for torque is derived considering stator and rotor control systems with regulators, and the bode plot of the closed loop transfer function is analyzed. According to the four-order mathematical equation, the stator flux, stator current, and electrical torque responses are derived by torque reference step and ramp in MATLAB from a pure mathematical deduction, which is identical with the responses in PSCAD/EMTDC simulation results. At last, the simulation studies are carried out in PSCAD software package to verify the resonant damping control strategy used in the EESG wind turbine system.
Keywords
Electrically excited synchronous generator; Stator flux oriented; Small signal analysis; Damping torque control;
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