汽轮发电机组次同步谐振的数字仿真分析

Digital emulating analysis of sub-synchronous resonance on turbo-generator rotor shaft units

电力系统中采用串联补偿电容可以提高线路输电能力和系统稳定性,但也可能引发电力系统的次同步谐振。以串补电容电力系统次同步谐振模拟机为研究对象,建立了机电互作用下汽轮发电机组轴系扭振响应的机电统一模型,对动模扭振模拟系统进行在电网故障工况下次同步谐振的数字仿真分析。分析了不同补偿度下的扭振响应和次同步谐振电流,为轴系的结构动态设计和机组安全可靠运行提供重要价值。

The use of series compensating capacitance can improve the ability of transmission and the stabilization ofelectricpowersystem, butit can arouse thesub-synchronous resonance (SSR). Basedonthe seriescompensating capacitance of electric power system, the authors discuss the cause, the mechatronics model and the digital emulating analysis of the SSR. The mechatronics model is founded under the interplay of mechanical and electric system, and the response of torsion vibration of a turbo-generator is simulated in network fault. The circuit with capacitance in series compensate will lead stronger response of torsion vibration. Higher is compensating degree, more fatally the SSR happens. The results will provide practical value for the stabilization and safety of electric power system.