Maximum output power control of wind generation system considering loss minimization of machines

This paper proposes a maximum output control of wind power generation system considering loss minimization of machines. The wind turbine has its own optimum rotational speed which produce the maximum power conversion for the given dimension and wind speed. Even at this optimum speed, the generator cannot produce the maximum output power due to the useless machine loss. In general, the machine loss can be reduced by the decreasing the flux level, resulting in the significant reduction of the core loss. For the vector-controlled induction machine drives, the d-axis current controls the excitation level and the q-axis current controls the generator torque, by which the speed of the induction generator is controlled according to the variation of the wind speed in order to produce the maximum output power. The generator reference speed is adjusted according to the optimum tip-speed ratio. The generated power flows into the utility grid through the back-to-back PWM converter. The grid-side converter controls the dc link voltage and the line-side power factor by the q-axis and the d-axis current control, respectively. Experimental results are shown to verify the validity of the proposed scheme.

[1]  Dong-Choon Lee,et al.  Stand-alone wind power generation system using vector-controlled cage-type induction generators , 2003, Sixth International Conference on Electrical Machines and Systems, 2003. ICEMS 2003..

[2]  Min Ho Park,et al.  A novel technique for optimal efficiency control of current source inverter fed induction motor , 1986, 1986 17th Annual IEEE Power Electronics Specialists Conference.

[3]  Guillermo O. García,et al.  Field-oriented controlled induction generator with loss minimization , 2002, IEEE Trans. Ind. Electron..

[4]  Frede Blaabjerg,et al.  On the energy optimized control of standard and high-efficiency induction motors in CT and HVAC applications , 1997 .

[5]  Bimal K. Bose,et al.  Fuzzy logic based on-line efficiency optimization control of an indirect vector-controlled induction motor drive , 1995, IEEE Trans. Ind. Electron..

[6]  Guillermo O. García,et al.  An efficient controller for an adjustable speed induction motor drive , 1994, IEEE Trans. Ind. Electron..

[7]  Alexander Kusko,et al.  Control Means for Minimization of Losses in AC and DC Motor Drives , 1983, IEEE Transactions on Industry Applications.

[8]  Sheng-Ming Yang,et al.  Loss‐minimization control of vector‐controlled induction motor drives , 2003 .

[9]  L. Chan,et al.  An independent maximum power extraction strategy for wind energy conversion systems , 1999, Engineering Solutions for the Next Millennium. 1999 IEEE Canadian Conference on Electrical and Computer Engineering (Cat. No.99TH8411).

[10]  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.

[11]  Birgitte Bak-Jensen,et al.  Conceptual survey of Generators and Power Electronics for Wind Turbines , 2001 .

[12]  Thomas A. Lipo,et al.  On-Line Efficiency Optimization of a Variable Frequency Induction Motor Drive , 1985, IEEE Transactions on Industry Applications.

[13]  J. G. Cleland,et al.  Design of an efficiency optimization controller for inverter-fed AC induction motors , 1995, IAS '95. Conference Record of the 1995 IEEE Industry Applications Conference Thirtieth IAS Annual Meeting.

[14]  J. Clare,et al.  A cage induction generator using back to back PWM converters for variable speed grid connected wind energy system , 2001, IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243).