Influence of Turbine Governor on Power System Dynamic Stability
WANG Guan-hong, TAO Xiang-yu, LI Wen-feng, LIU Zeng-huang, ZHAO Hong-guang (China Electric Power Research Institute, Haidian District, Beijing 100192, China)
With the construction and development of power grids interconnection, the problem of power system dynamic stability becomes more and more important. As one of the key elements of the power system, turbine governor plays an important role in sticking up for the system stability and the power supply quality. In order to study the dynamic stability of the inter-connected power systems better, it is necessary to study the impact of turbine governor on the dynamic stability of power system. This paper describes the mechanism of turbine governor’s impact on the power system dynamic stability. The conclusions of the mechanism are verified from both of time domain and frequency domain. A △ω-△δ coordinates system has been established and the regions where turbine governor would constitute positive or negative damping to the oscillation modes have been found out. By add the turbine governor’s transfer function to the Phillips-Heffron model, analyses of frequency response and damping characteristics of the turbine governor has been done, and a general conclusion has been obtained. Further more, the concept of boundary frequency is being introduced. The influence of some key parameters of turbine governor on power system dynamic stability has been studied, mainly with small signal analysis and Prony calculation. The results prove the mechanism is correct. The influence of turbine governor on the power system dynamic stability is associated with not only its model and parameters, but also the oscillation frequency and participation factor of the unit to one oscillation model.
【CateGory Index】： TM712