Integration of Fixed and Variable Speed Wind Generator Dynamics with Multimachine AC Systems

The impact of fixed speed squirrel cage type as well as variable speed doubly fed induction generators (DFIG) on dynamic performance of a multimachine power system has been investigated. Detailed models of the various components have been presented and the integration of asynchronous and synchronous generators has been carried out through a rotor angle based transform. Simulation studies carried out considering the conventional dynamic model of squirrel cage asynchronous generators show that integration, as such, could degrade to the AC system performance transiently. This article proposes a frequency or power controller which can effectively control the transients and restore normal operation of fixed speed induction generator quickly. Comparison of simulation results between classical cage and doubly-fed induction generators indicate that the doubly fed induction machine is more adaptable to multimachine AC system. Frequency controller installed in the DFIG system can also improve its transient profile. Keywords—Doubly-fed generator, Induction generator, Multimachine system modeling, Wind energy systems

[1]  Holmes,et al.  Cycloconverter-exited divided-winding doubly-fed machine as a wind-power convertor , 1984 .

[2]  J. Morren,et al.  Ridethrough of wind turbines with doubly-fed induction generator during a voltage dip , 2005, IEEE Transactions on Energy Conversion.

[3]  H.H. Zurn,et al.  Influence of the variable-speed wind generators in transient stability margin of the conventional generators integrated in electrical grids , 2004, IEEE Transactions on Energy Conversion.

[4]  Poul Ejnar Sørensen,et al.  Simulation of the impact of wind power on the transient fault behavior of the Nordic power system , 2007 .

[5]  A. Mullane,et al.  Modeling of the wind turbine with a doubly fed induction generator for grid integration studies , 2006, IEEE Transactions on Energy Conversion.

[6]  George Stavrakakis,et al.  A general simulation algorithm for the accurate assessment of isolated diesel-wind turbines systems interaction. I. A general multimachine power system model , 1995 .

[7]  G. Tapia,et al.  Modeling and control of a wind turbine driven doubly fed induction generator , 2003 .

[8]  B. M. Nomikos,et al.  Evaluation of motor effects on the electromechanical oscillations of multimachine systems , 2003, 2003 IEEE Bologna Power Tech Conference Proceedings,.

[9]  Johan Enslin,et al.  Novel control strategies for variable-speed doubly fed wind power generation systems , 1995 .

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

[11]  A.H.M.A. Rahim,et al.  DFIG rotor voltage control for system dynamic performance enhancement , 2011 .

[12]  William Leithead,et al.  Appropriate realization of gain-scheduled controllers with application to wind turbine regulation , 1996 .

[13]  J. G. Slootweg,et al.  Wind Power: Modelling and Impact on Power System Dynamics , 2003 .

[14]  M.J. Gibbard,et al.  Effect of wind generation on small-signal stability — A New Zealand Example , 2008, 2008 IEEE Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century.

[15]  G. B. Giannakopoulos,et al.  A variable speed wind energy conversion scheme for connection to weak AC systems , 1999 .

[16]  S.M. Muyeen,et al.  Transient Stability Augmentation of Power System Including Wind Farms by Using ECS , 2008, IEEE Transactions on Power Systems.

[17]  Mohamed Machmoum,et al.  Steady-state analysis of a doubly fed asynchronous machine supplied by a current-controlled cycloconvertor in the rotor , 1992 .

[18]  B. T. Ooi,et al.  Induction-generator/synchronous-condenser system for wind-turbine power , 1979 .

[19]  J. Cidras,et al.  Modeling of wind farms in the load flow analysis , 2000 .

[20]  Eduard Muljadi,et al.  The History and State of the Art of Variable-Speed Wind Turbine Technology , 2001 .