The Dynamic Analysis of Hydropower House and Unit System in Coupled Hydraulic-mechanical-electric Factors

28th IAHR symposium on Hydraulic Machinery and Systems

Ma, Z.Y.^1 ; Wu, Q.Q.^1

Dalian University of Technology, NO.2 Linggong Road, Dalian

116024, China^1

关键词: Coupled vibrations;    Hydraulic mechanicals;    Hydropower stations;    Numerical calculation;    Part load conditions;    Small fluctuation;    Structural vibration properties;    Unbalanced magnetic pull;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/49/5/052011/pdf
DOI  :  10.1088/1755-1315/49/5/052011

来源: IOP

【 摘 要 】

A hydraulic-mechanical-electric and structures coupled model of hydropower station system including subsystem models of the penstock, hydro-turbine model, speed governor, synchronous generator as well as grid, rotor-bearing system and powerhouse structure is established. This model is used to simulate the small fluctuation transient process of 10% load-up in the part load condition for hydropower station. Mechanical eccentric force, unbalanced magnetic pull and vortex pressure fluctuation at inlet of draft tube are considered in the numerical calculation. The interaction between hydraulic-mechanical-electric coupled factors and structural vibration properties during the small fluctuation transient process is studied. The results indicate that the speed regulation for turbine has very litter impact on the transient process of generator. In the process of small fluctuation with loading method in this paper, structure of powerhouse is greatly influenced by vortex pressure pulse in the draft tube, and the vibration of unit is excited by loads which caused by itself rotating.