大扰动下次同步谐振仿真分析的模型改进及应用

结合实际工程需求及实践经验,对次同步谐振(sub synchronous resonance,SSR)仿真研究几个重要方面,即机组轴系、串补及附加励磁阻尼控制(supplementary excitation damping control,SEDC)建模和RTDS仿真进行了精细化研究,使其适用于大扰动时的SSR模式稳定性、暂态扭矩和疲劳损耗的精确分析。将改进仿真方法应用于实际串补输电工程,通过上都电厂送出系统一次短路故障情况下SSR事件的仿真分析,并与实际结果进行对比,验证了所述方法在实际工程SSR分析中的适用性、准确性和有效性。SSR仿真与实际大扰动事件对比分析在国内外应属首次,具有重要的参考价值。

The Improved Simulation Model for Transient Study of Subsynchronous Resonance During Large Disturbance and Its Engineering Practice

According to practical experiences and based on the demands of practical projects,several important aspects of subsynchronous resonance(SSR),namely the delicate modeling of generator shaft,fixed series capacitor,supplementary excitation damping control(SEDC) and the real-time digital simulation(RTDS) of SSR,are researched in detail to make them suitable to the accurate analysis on modal stability,transient torque and fatigue life loss when the target system suffers large disturbances.The improved simulation method is applied to actual series-compensated power transmission.By means of simulation analysis on a SSR under short-circuit fault occurred in sending system of Shangdu power plant and the comparison of simulation results of SSR with its actual measured data,the applicability,accuracy and effectiveness of the proposed method in the SSR analysis for actual engineering are verified.It is the first time to adopt the comparative analysis between the simulation results of post-fault SSR and its actual measured data home and abroad,therefore the proposed method possesses reference value.