Damping Torque Analysis Based on Extended C1 ~ C15 Model with Consideration of Under Excitation Limiter and Damping Windings
- Resource Type
- Conference
- Authors
- Zhao, Liangde; Ding, Jianshun; Shu, Qiqi; Gao, Yin; Zhang, Hongsheng; Wang, Qing
- Source
- 2018 2nd IEEE Conference on Energy Internet and Energy System Integration (EI2) Energy Internet and Energy System Integration (EI2), 2018 2nd IEEE Conference on. :1-6 Oct, 2018
- Subject
- Power, Energy and Industry Applications
Torque
Damping
Windings
Power system stability
Analytical models
under-excited limiter(UEL)
damping windings
model
torque analysis
- Language
Under-excited limiter (UEL) is one of the important auxiliary functions in generator excitation system. It has significant influence on the small signal stability of power system. However, the conventional analysis method based on Heffron-Phillips model does not consider the dynamic action of damping windings effectively. Based on the one machine infinite bus $C_{1}\sim C_{12}$ model including the damping windings, the extended $C_{1}\sim C_{15}$ model with consideration of UEL is derived. The mechanism of the system damping weaken by superimposed type of UEL is proposed based on the principle of superposition and electromagnetic torque analysis method. The results show that the electromagnetic torque provided by UEL through the main excitation channel weakens the system damping and the electromagnetic torque generated by UEL through q-axis damper winding enhances system damping. The damping torque provided by UEL reduces as the boundary line slope of UEL increases until the positive to negative. The total damping torque of the system is greatly reduced as the UEL boundary line slope increases.