The Application of Complex Torque Coefficient Method in Multi-generator System

  • Kun Xu
  • Chengyong Zhao
  • Jie Zhang
  • Chunlin Guo
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 99)


A multi-input and multi-output linear model of multi-machine power system was established based on perturbation analysis, and the complex torque coefficient of target generator was deduced in detail. From a mathematical perspective, the meaning of complex torque coefficient was explained. Meanwhile, the reasonability about non-target generators being equivalent to different models was discussed when investigating subsynchornous oscillation phenomenon in a multi-generator system. The results showed that the complex torque coefficient method was suitable for multi-generator system and the procedure of simplifying non-target generator as single rigid body or voltage sources with fixed frequency was inappropriate. Then a case study of IEEE second benchmark verified the conclusions above.


complex torque coefficient subsynchronous oscillation multi-generator system 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Kun Xu
    • 1
  • Chengyong Zhao
    • 1
  • Jie Zhang
    • 1
  • Chunlin Guo
    • 1
  1. 1.Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of EducationNorth China Electric Power UniversityBeijingChina

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