Stability analysis of the governor-turbine-hydraulic system of pumped storage plant during small load variation

28th IAHR symposium on Hydraulic Machinery and Systems

Yu, X.D.^1 ; Zhang, J.^1 ; Chen, S.^1 ; Liu, J.C.^1

College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, China^1

关键词: Characteristics method;    Eigenvalue methods;    Mechanical and electrical;    Operating condition;    Pumped storage plants;    Stability analysis;    Strong coupling;    Turbine hydraulics;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/49/11/112004/pdf
DOI  :  10.1088/1755-1315/49/11/112004

来源: IOP

【 摘 要 】

Governor-turbine-hydraulic (GTH) system is complex because of strong couplings of hydraulic, mechanical and electrical system. This paper presents a convenient mathematical model of the GTH system of a pumped storage plant (PSP) during small load variation. By using state space method and eigenvalue method, the stability of the GTH system is analyzed and the stable regions of the system can be given as well, which would help to optimize system design or the turning of governors. The proposed method is used to analyze the stability of a practical pumped storage plant during small load variation, which is also simulated in time domain on the basis of characteristics method. The theoretical analysis is in good agreement with numerical simulations. Based on the proposed method, the effect of the system parameters and operating conditions on the stable regions is investigated. These results are useful for the design of the GTH system of pumped storage plants.