Effect analysis of generator governor system and its frequency mode on inter-area oscillations in power systems

Abstract The governor system of a synchronous generator not only can influence the damping characteristics of inter-area oscillations but also introduces a special ultra-low frequency mode into the power system. This mode, called frequency mode, has a lower frequency than that of inter-area modes and would appear when the governor system regulates the rotor speed. In this paper, the influence of governor system on the damping characteristics of inter-area oscillations is investigated by using the torque analysis theory. Then the feature of the frequency mode and its influence on inter-area oscillations are analyzed by using a 4-machine 2-area benchmark system. The analysis results show that the frequency mode is a control mode of the governor system and its damping ratio is mainly influenced by the parameters of the proportional-integral-derivative (PID) controller used for the governor system. When the governor system makes the damping ratio of an inter-area mode negative and the dead band is taken into account, the inter-area oscillation will gradually become an equal amplitude oscillation in case the damping of the frequency mode is relatively strong, while the inter-area oscillation will appear like a beat frequency oscillation in case the damping of the frequency mode is relatively weak. Finally, simulation results of a practical large-scale interconnected power system validate the effectiveness of the above analysis results.

[1]  Evangelos Farantatos,et al.  A measurement-based approach for power system instability early warning , 2016 .

[2]  Jinyu Wen,et al.  Wide-Area Damping Controller for Power System Interarea Oscillations: A Networked Predictive Control Approach , 2015, IEEE Transactions on Control Systems Technology.

[3]  Yilu Liu,et al.  Impact of Governor Deadband on Frequency Response of the U.S. Eastern Interconnection , 2016, IEEE Transactions on Smart Grid.

[4]  Ju Liu,et al.  Solution to short-term frequency response of wind farms by using energy storage systems , 2016 .

[5]  Liu Zenghuang Analysis on Speed Governing System Model for Fossil-Fuel Generating Plant and Its Application in Power System Stability Simulation , 2008 .

[6]  Su Yinsheng Analysis on the CSG’s Power Oscillation Events in Recent Years , 2013 .

[7]  Costas D Vournas,et al.  Application of QSS Modeling to Stabilizer Design for Interarea Oscillations , 2010, IEEE Transactions on Power Systems.

[8]  Shijie Cheng,et al.  Improved synergetic excitation control for transient stability enhancement and voltage regulation of power systems , 2015 .

[9]  O. B. Tor,et al.  Assessment of the effect of hydroelectric power plants' governor settings on low frequency inter area oscillations , 2010, 2010 International Conference on Power System Technology.

[10]  Qinghua Wu,et al.  Nonlinear maximum power point tracking control and modal analysis of DFIG based wind turbine , 2016 .

[11]  Fang Liu,et al.  Design and Implementation of Delay-Dependent Wide-Area Damping Control for Stability Enhancement of Power Systems , 2017 .

[12]  Wei Yao,et al.  Wide-Area Damping Controller of FACTS Devices for Inter-Area Oscillations Considering Communication Time Delays , 2014, IEEE Transactions on Power Systems.

[13]  Hongyu Wang,et al.  The effect of prime moves and governors on the low frequency oscillations of Yunnan Power Grid , 2011, 2011 International Conference on Electrical Machines and Systems.

[14]  Haibo He,et al.  Adaptive wide-area power oscillation damper design for photovoltaic plant considering delay compensation , 2017, Monitoring and Control using Synchrophasors in Power Systems with Renewables.

[15]  Xu Yanhui,et al.  The resonance mechanism low frequency oscillations induced by nonlinear governor system , 2011, 2011 International Conference on Business Management and Electronic Information.

[16]  Wang Guanhong,et al.  Mechanism of impact of governor control on power system dynamics and introduction of boundary frequency , 2011, 2011 IEEE/PES Power Systems Conference and Exposition.

[17]  Yilu Liu,et al.  Dynamic Model Validation with Governor Deadband on the Eastern Interconnection , 2014 .

[18]  Fang Liu,et al.  A Virtual Impedance Comprehensive Control Strategy for the Controllably Inductive Power Filtering System , 2017, IEEE Transactions on Power Electronics.

[19]  Haibo He,et al.  Adaptive Supplementary Damping Control of VSC-HVDC for Interarea Oscillation Using GrHDP , 2018, IEEE Transactions on Power Systems.

[20]  Ires Iskender,et al.  A compensator design for the aged hydro electric power plant speed governors , 2016 .

[21]  T. Van Cutsem,et al.  Quasi steady-state models for long-term voltage and frequency dynamics simulation , 2005, 2005 IEEE Russia Power Tech.

[22]  J. D. McCalley,et al.  Analysis of Very Low Frequency Oscillations in Hydro-Dominant Power Systems Using Multi-Unit Modeling , 2012, IEEE Transactions on Power Systems.

[23]  Jiuping Pan,et al.  Study on power plant integrated excitation and turbine control strategies , 2014, 2014 International Conference on Power System Technology.

[24]  Herwig Renner,et al.  Damping low frequency oscillations with hydro governors , 2013, 2013 IEEE Grenoble Conference.

[25]  Geza Joos,et al.  Quasi-Steady-State Approach for Analysis of Frequency Oscillations and Damping Controller Design , 2016, IEEE Transactions on Power Systems.

[26]  Zhou Xiaoxin,et al.  Power System Analysis Software Package (PSASP)-an integrated power system analysis tool , 1998, POWERCON '98. 1998 International Conference on Power System Technology. Proceedings (Cat. No.98EX151).

[27]  J. C. Mantzaris,et al.  Analysis of Interarea Oscillations Including Governor Effects and Stabilizer Design in South-Eastern Europe , 2013, IEEE Transactions on Power Systems.

[28]  Xu Yanhu A Low Frequency Oscillation Event Caused by Primal Frequency Modulation Test and Its Mechanism Analysis , 2013 .

[29]  Charles Concordia,et al.  Concepts of Synchronous Machine Stability as Affected by Excitation Control , 1969 .

[30]  Gengyin Li,et al.  Research on frequency oscillation of HVDC sending system in islanded mode of hydro power units , 2014, 2014 International Conference on Power System Technology.

[31]  Li Tao,et al.  Analysis and control on ultra low frequency oscillation at seeding end of UHVDC power system , 2014, 2014 International Conference on Power System Technology.

[32]  A. Mayouf,et al.  Study of Excitation and Governor power system stabilizers effect on the stability enhancement of a single machine infinte-bus power system , 2013, 2013 12th International Conference on Environment and Electrical Engineering.

[33]  Jinyu Wen,et al.  Chronological operation simulation framework for regional power system under high penetration of renewable energy using meteorological data , 2017 .

[34]  Innocent Kamwa,et al.  Small signal analysis of hydro-turbine governors in large interconnected power plants , 2002, 2002 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.02CH37309).

[35]  R. A. Phillips,et al.  Effect of a Modern Amplidyne Voltage Regulator on Underexcited Operation of Large Turbine Generators [includes discussion] , 1952, Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems.

[36]  Jiakun Fang,et al.  Adaptive power oscillation damping controller of superconducting magnetic energy storage device for interarea oscillations in power system , 2016 .

[37]  Anja Oftebro Analysis of Slow Frequency Variations in the Nordic Power System , 2014 .

[38]  Yonghua Song,et al.  Modern Power Systems Analysis , 2008 .

[39]  P. Kundur,et al.  Power system stability and control , 1994 .