多模式次同步谐振扰动清除时序对轴系扭矩放大的影响  

Impact of fault clearing time on shaft torque amplification in multi-mode sub-synchronous resonance

作　　者：翁宗林[1] 卢继平[1] 乔梁[2] 高道春 谢应昭[1] 徐兵[1] 尹远[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400030 [2]重庆电力调度通信中心,重庆400014 [3]云南电力调度控制中心,云南昆明650011

出　　处：《电力系统保护与控制》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)

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.

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 

分 类 号：TM712[电气工程—电力系统及自动化]