模态叠加对次同步谐振暂态扭矩放大的影响  

Effect of Modal Superimposition on Transient Torque Amplification of Subsynchronous Resonance

作　　者：陈武晖[1] 毕天姝[1] 杨奇逊[1] 

机构地区：[1]电力系统保护与动态安全监控教育部重点实验室(华北电力大学),北京市昌平区102206

出　　处：《中国电机工程学报》2010年第28期1-6,共6页Proceedings of the CSEE

基　　金：新世纪优秀人才支持计划项目(NCET-05-0216);长江学者和创新团队发展计划项目(IRT0515);高等学校学科创新引智计划项目(B08013)~~

摘　　要：应用扭矩2阶解分析暂态扭矩中模态叠加互作用机制。对2个模态的频率谐振和拍频2种模态叠加互作用进行数学推导。并重点分析反相位、同相位和正交相位等初始相位关系对这2种模态叠加互作用的影响。分析结果表明,频率谐振模态叠加互作用最大幅值受初始相位关系的影响,而拍频模态叠加互作用的最大幅值接近于叠加模态初始幅值之和,与初始相位无关。这些分析把暂态扭矩放大与系统模态及其互作用联系起来,有助于准确理解暂态扭矩放大机制,进而寻找缓解暂态扭矩放大的措施。选用IEEE第1标准模型进行仿真分析,验证分析的正确性。The mechanism of superimposed modal interactions was developed by using the second-order solutions of torques. The frequency-resonant and frequency-beating superimposed modal interactions of two modes were mathematically derived. The effect of three kinds of initial phase relationships comprising in-phase, opposed-phase and quadrature-phase on the two types of superimposed modal interactions, was investigated. The results show that the maximum peak of frequency-resonant superimposed modal interactions depends on the initial phase whereas the maximum peak of frequency-beating superimposed modal interactions approaches the sum of the initial amplitudes of superimposed modes and is independent of the initial phase. This analysis relates the system modes and their interactions to the transient torque amplification and lends itself to understanding the exact mechanism of the transient torque amplification. Furthermore, the measure can be acquired for mitigating the transient torque amplification. The IEEE first benchmark system was adopted to implement the study and some new viewpoints of practicable significance were obtained.

关 键 词：暂态扭矩放大 模态叠加互作用 次同步谐振 电力系统 

分 类 号：TM71[电气工程—电力系统及自动化]