Analysis of Nonlinear Characteristics of Turbine Governor and Its Impact on Power System Oscillation
- 1 Electric Power Research Institute, Guangdong Power Grid, Guangzhou, China
- 2 School of Electric Power, South China University of Technology, Guangzhou, China
- 3 Electric Power Research Institute, Guangdong Power Grid, Guangzhou, China
- 4 School of Electric Power, South China University of Technology, Guangzhou, China
- 5 School of Electric Power, South China University of Technology, Guangzhou, China
Abstract
In this paper, the model of turbine governor based on the physical principles is constituted to improve the accuracy of power system dynamic simulation, making the results of simulation consistent with the actual situation. The unit and grid coupling model which reflects the interaction between thermal system of power plant and power system is built using EMTDC/PSCAD. The influence of nonlinear characteristics on the valve opening and the steam turbine mechanical power is also analyzed in this paper. The results of simulation show that the improper setting of parameters reflecting nonlinear characteristics of turbine governor can lead to the cyclical oscillations of the valve opening and the steam turbine mechanical power, and even can lead to the power oscillation persistently. The research achievements in this paper have a certain reference value on exploring the causes of power oscillation from the prime mover.
- D. R. Yu and J. Y.Xu, “The Effects of Governor On The Stability of Turbo-Generator,” Power System Automation, Vol. 20, No. 1,1996, pp.23-26.
- Z. Y. Han, Y. H. Xu, Y. Li and C. Q. Wu, “Power System Low Frequency Oscillation of Resonance Mechanism Induced by Disturbance of Turbine-Governing System,” Shaanxi Electric Power, Vol. 7, 2009, pp. 1-5.
- G. H. Wang and X. Huang, “Influence of Turbine Governor Parameters on Power System Damping,” Electric Power Automation Equipment, Vol. 31, No. 4, 2009, pp. 87-90.
- Y. Wang, Y. S. Wang and Z. H. Li, “Model and Nonlinear Analysis of 300MW Steam Turbine Speed Control System,” Steam Turbine Technology, Vol. 49, No. 1, 2007, pp. 17-20.
- G. X. Miao, “Parameter Identification of Steam Turbine Digital Electro-hydraulic Control System and Application,” Baoding: north China electric power university, 2004.
- H. Q. Lv, Y. Su, J. Y. Yang and Z. X. Li, “The Nonlinear Characteristics of Electro-hydraulic Servo System and Its Effect Analysis,” Machine Tool and Hydraulics, 2002.
- D. R. Yu, W. Bo and W. T. Ju, “The Effects of Nonlinear Characteristics of Steam Turbine Governor System on The Torsional Stability,” Steam Turbine Technology, Vol. 33, No. 5, 1997, pp. 257-261.
- C. D. Vournas, “Unstable Frequency Oscillation in a Slow-Response Reheat-Turbine Generator,” IEEE Transactions on Automatic Control, 1998.
- Z. P. Zhou, “First Frequency Modulation Delimitation for Electric System Stabilization Analyze,” Henan Electric Power, Vol. 3, 2009, pp. 40-45.
- Y. S. Hao, L. N. Zeng and Y. H. Yang, “Analysis of The Influence of Governor Back-lashon GPSS,” North China Electric Power University Acta, Vol. 4, 1992, pp. 1-6.