Power balancing in variable speed wind-energy systems using vector control of front-end converters

This paper presents a novel power balance control method for wind energy systems feeding an isolated grid. The system is based on a variable-speed wind energy conversion system (WECS) connected to an AC load using a power converter. An energy storage system, connected to the AC load using an additional converter, is used to balance the power generated by the WECS with the load. In this paper the vector control systems for both interfacing power converters are discussed. The proposed control methods are implemented in a 2 kW experimental prototype and the experimental results are fully analysed and discussed in the paper.

[1]  R. Cardenas,et al.  Sensorless vector control of induction machines for variable-speed wind energy applications , 2004, IEEE Transactions on Energy Conversion.

[2]  Robert E. Hebner,et al.  Flywheel batteries come around again , 2002 .

[3]  J.C. Clare,et al.  Control strategies for voltage control of a boost type PWM converter , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[4]  Roger Dettmer.  Revolutionary energy-a wind/diesel generator with flywheel storage , 1990 .

[5]  L. Garcia-Tabares,et al.  Design and simulation of a stand-alone wind-diesel generator with a flywheel energy storage system to supply the required active and reactive power , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[6]  R. Jones,et al.  Application of a power-controlled flywheel drive for wind power conditioning in a wind/diesel power system , 1999, IEMDC 1999.

[7]  D. S. Zinger,et al.  A variable speed wind turbine power control , 1997 .

[8]  Eduard Muljadi,et al.  Pitch-controlled variable-speed wind turbine generation , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[9]  J. Clare,et al.  Power smoothing in wind generation systems using a sensorless vector controlled induction Machine driving a flywheel , 2004, IEEE Transactions on Energy Conversion.

[10]  M Maarten Steinbuch.  Optimal multivariable control of a wind turbine with variable speed , 1987 .

[11]  Zhihong Ye,et al.  Output filter design for a grid-interconnected three-phase inverter , 2003, IEEE 34th Annual Conference on Power Electronics Specialist, 2003. PESC '03..