基于开环子系统模式信息的次同步谐振机理研究  

Mechanism Study of Subsynchronous Resonance Based on Open-Loop Modal Information

作　　者：王洋 杜文娟 王海风 Wang Yang;Du Wenjuan;Wang Haifeng(State Key Laboratory of Alternate Electric Power Systems with New Energy Resources North China Electric Power University,Beijing 102206 China;College of Electrical Engineering Sichuan University,Chengdu 610065 China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]四川大学电气工程学院,成都610065

出　　处：《电工技术学报》2019年第24期5209-5220,共12页Transactions of China Electrotechnical Society

基　　金：国家重点研发计划(2016YFB0900602);中央高校基本科研业务专项资金(YJ201654,2018QN010)资助项目。

摘　　要：汽轮发电机-串补输电系统的次同步谐振是次同步振荡研究领域的经典问题,开环模式分析法和复转矩系数法是其典型的机理分析方法。该文在现有开环模式分析法的基础上,进一步考虑了开环振荡模式之间的距离这一影响因素,提出基于机械、电气两个开环子系统的开环模式信息(开环振荡模式及其之间的距离和留数)来评估闭环模式的方法。基于IEEESSRFBM:①揭示了轴系扭振的开环模式耦合条件--当开环扭振模式和开环串补振荡模式靠近时,相应的闭环振荡模式将会朝相反方向远离开环振荡模式,偏移程度与开环振荡模式间的距离和留数有关;②揭示了感应发电机效应与电气子系统开环振荡模式的关联;③揭示了附加电力系统稳定器(PSS)次同步谐振阻尼控制器通过影响开环模式信息从而提高轴系扭振稳定性的机理。Sub-synchronous resonance of turbine-generator integrated series-compensated power system is a classic problem in the field of sub-synchronous oscillation research. The typical analysis methods include open-loop modal analysis method and complex torque coefficient method. To improve the existing open-loop modal analysis method, this paper further considered the influencing factors of the distance between open-loop modes, and proposed a method to evaluate the closed-loop modes by using the open-loop modal information of the interconnected open-loop subsystems. Based on IEEE SSR FBM, firstly, the mechanism of torsional vibration was revealed as the open-loop modal coupling, i.e., open-loop modes of two subsystems are close to each other. And the coupling between two open-loop modes may cause closed-loop modal repulsion, which is related to the distance and residues between two open-loop modes. Then, the relationship between induction generator effect and open-loop mode of the electrical subsystem was studied. Finally, the mechanism of the additional power system stabilizer sub-synchronous resonance damping controller to improve the stability of the torsional vibration of the shafting system by affecting the open loop modal information was revealed.

关 键 词：汽轮发电机 串补输电系统 次同步谐振 开环模式信息 

分 类 号：TM712[电气工程—电力系统及自动化]