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A method of tracking the peak power points for a variable speed wind energy conversion system

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2 Author(s)
Datta, R. ; ABB Corp. Res. Centre, Ladenburg, Germany ; Ranganathan, V.T.

In this paper, a method of tracking the peak power in a wind energy conversion system (WECS) is proposed, which is independent of the turbine parameters and air density. The algorithm searches for the peak power by varying the speed in the desired direction. The generator is operated in the speed control mode with the speed reference being dynamically modified in accordance with the magnitude and direction of change of active power. The peak power points in the P-ω curve correspond to dP/dω=0. This fact is made use of in the optimum point search algorithm. The generator considered is a wound rotor induction machine whose stator is connected directly to the grid and the rotor is fed through back-to-back pulse-width-modulation (PWM) converters. Stator flux-oriented vector control is applied to control the active and reactive current loops independently. The turbine characteristics are generated by a DC motor fed from a commercial DC drive. All of the control loops are executed by a single-chip digital signal processor (DSP) controller TMS320F240. Experimental results show that the performance of the control algorithm compares well with the conventional torque control method.

Published in:

Energy Conversion, IEEE Transactions on  (Volume:18 ,  Issue: 1 )

Date of Publication:

Mar 2003

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