Sensitivity analysis of the coupling model of a hydro-turbine governing system and a shaft system to system parameters

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (8) : 78-88.

ZHANG Zhiping1，ZHANG Songxiao1，YANG Xiong1，QIN Cheng1，SUN Jie2，FENG Chen3，ZHANG Yuquan3

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Abstract

The frequent transient process of pumped storage power station has an important effect on shafting vibration, so it is very important to establish a coupling model between the regulation system and shafting which can reflect the transient response of hydropower units for the safe operation of pumped storage power station. In this paper, a transient coupling model between the regulation system and the shafting system considering multiple vibration factors is established based on the torque equation derived from the Lagrangian formula. The dynamic response process of the shafting under different load rejection is calculated, and the influence of the eccentric mass of the generator and the excitation current of the generator on the transient process of the shafting is analyzed. It is found that the more the load is rejected, the more severe the vibration of the shafting in the process of dynamic response. After 30 %, 60 % and 100 % load rejection, the amplitude of the generator rotor in the x direction is increased by 68.7 %, 109.3 % and 126.3 % respectively compared with that before load rejection. The larger the eccentric mass of the generator is, the higher the amplitude of the shaft system of the hydro-generator set in the dynamic response process is, and the more unstable the system is. The larger the excitation current is, the smaller the amplitude of the shaft system in the response process is, which is more conducive to the stable operation of the system. The purpose of this paper is to provide a method for the establishment of the transient coupling model of the regulating system and shafting system of hydro-generator set, discuss and evaluate the parameter sensitivity of the transient coupling model under load rejection, and ensure the safe and stable operation of the unit under the transient state.

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Pumped storage power station / governing system / shaft system / dynamic response / excitation current / load rejection

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ZHANG Zhiping1，ZHANG Songxiao1，YANG Xiong1，QIN Cheng1，SUN Jie2，FENG Chen3，ZHANG Yuquan3. Sensitivity analysis of the coupling model of a hydro-turbine governing system and a shaft system to system parameters[J]. Journal of Vibration and Shock, 2024, 43(8): 78-88

References

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