摘要
针对多模式次同步谐振中暂态扭矩放大现象,将轴系扭矩视为轴系对冲击力的响应,建立了一个轴系扭矩与扰动清除时间关系的简化四自由度模型。对该模型运用模态分析法,推导得到了轴系扭矩与扰动清除时间关系的显式表达式。研究结果表明:扰动所激发的发电机轴系各自然振荡频率均以余弦形式参与轴系扭振,并且在其自振荡频率半周期的偶数倍时切除扰动,则可使轴系扭矩峰值取得较小值。运用PSCAD/EMTDC对上都串补系统进行仿真,验证了该结论的正确性。
For shaft torque amplification in multi-mode sub-synchronous resonance. A methodology considering shaft torque as the torsional system response of applied force is given. The maximum shaft torque is finally deduced as an analytic function of fault clearing time using a simplified four- DOF model. The results show that the natural oscillation frequencies of the shaft inspired by the disturbance are in the form of torsional vibration cosine, and that fault clearing at even numbers of half cycles of one torsional mode will generally provide appropriate torques. PSCAD/EMTDC simulation results demonstrate the validity of the conclusion.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第7期1-6,12,共7页
Power System Protection and Control
基金
中央高校基本科研业务费资助(CDJXS11150018)
关键词
多模式次同步谐振
扰动清除时序
轴系扭矩放大
模态分析法
multi-mode sub-synchronous resonance
fault cleating time
shaft torque amplification
modal analysis method
