Additional mechanical torque coefficient of hydro turbine and governor system

Yun Zeng, Lixiang Zhang, Jing Qian, Yakun Guo

Research output: Contribution to journalArticlepeer-review


The change of mechanical torque is usually ignored in small disturbance of power systems, which means that influences of the hydro turbine and governor system (HTGS) have been ignored. The disturbance characteristics of the hydro turbine generating units including the HTGS is studied based on torque coefficients method in this paper, and calculating method and expressions of torque coefficients of the HTGS are given. The additional mechanical damping produced by the HTGS can be expressed as Dt¿¿, therefore, it can be merged into the damping item in the motion equation of generator, that means that its action is equivalent to modify damping coefficient D. Using a case, the analysis and calculation method are introduced, and several conclusions are given.
Original languageEnglish
Pages (from-to)954-961
Number of pages8
JournalAdvanced Materials Research
Publication statusPublished - Jan 2012


  • hydro turbine
  • governor system
  • torque coefficient
  • oscillations


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