Development of a Variable-Speed Wind Energy Conversion System Based on Doubly-Fed Induction Generator

A variable-speed constant-frequency (VSCF) doubly-fed induction generator (DFIG) system using a back-to-back PWM converter connected between the generator rotor circuit and the power grid is investigated by the authors. By using a stator-voltage oriented vector control scheme, the independent control of the active and reactive power generated by the induction machine is achieved, based on which, the control principle for DFIG is presented in detail. The bi-directional PWM converter and its controls not only decrease the current harmonics both in the rotor side and in the grid side and thus improve the power quality, but also expand the operation range and then improve the system energy efficiency. In addition, the maximum power point tracking (MPPT), power factor control in the stator side, and soft-connection to and soft-disconnection from the grid are also achieved and reported in this paper. To validate the control strategy developed in this paper, a 110kVA test system for wind-energy generation has been designed and built, on which a series of experiments have been carried out. The experimental results are presented in the paper.

[1]  S. Salman,et al.  Windmill Modeling Consideration and Factors Influencing the Stability of a Grid-Connected Wind Power Based Embedded Generator , 2002, IEEE Power Engineering Review.

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

[3]  Yongdong Li,et al.  Vector control and synchronization of doubly fed induction wind generator system , 2004, The 4th International Power Electronics and Motion Control Conference, 2004. IPEMC 2004..

[4]  Mohamed Machmoum,et al.  Steady state analysis and experimental investigation of a doubly-fed induction machine supplied by a 'current-source' cycloconverter in the rotor , 1990 .

[5]  F. Blaabjerg,et al.  Voltage recovery of grid-connected wind turbines with DFIG after a short-circuit fault , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[6]  Muammer Ermis,et al.  Double-output induction generator operating at subsynchronous and supersynchronous speeds: steady-state performance optimisation and wind-energy recovery , 1992 .

[7]  J.M. Carrasco,et al.  DSP-based doubly fed induction generator test bench using a back-to-back PWM converter , 2004, 30th Annual Conference of IEEE Industrial Electronics Society, 2004. IECON 2004.

[8]  S. K. Salman,et al.  Windmill modelling consideration and factors influencing the stability of a grid-connected wind power based embedded generator , 2003, 2003 IEEE Power Engineering Society General Meeting (IEEE Cat. No.03CH37491).

[9]  Henk Polinder,et al.  Dynamic modelling of a wind turbine with doubly fed induction generator , 2001, 2001 Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.01CH37262).

[10]  Malcolm McCulloch,et al.  Control method comparison of doubly fed wind generators connected to the grid by asymmetric transmission lines , 2000 .

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

[12]  V. T. Ranganathan,et al.  A Method of Tracking the Peak Power Points for a Variable Speed Wind Energy Conversion System , 2002, IEEE Power Engineering Review.

[13]  C.J. Ramos,et al.  Current control in the grid connection of the double-output induction generator linked to a variable speed wind turbine , 2002, IEEE 2002 28th Annual Conference of the Industrial Electronics Society. IECON 02.

[14]  R.W. De Doncker,et al.  Adjustable speed generators for wind turbines based on doubly-fed induction machines and 4-quadrant IGBT converters linked to the rotor , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[15]  K. B. Mohanty,et al.  DSP-Based Doubly Fed Induction Generator Test Bench Using a Back-to-Back PWM Converter , 2009, 2009 Asia-Pacific Power and Energy Engineering Conference.

[16]  Jon Clare,et al.  Doubly fed induction generator using back-to-back PWM converters and its application to variable-speed wind-energy generation , 1996 .