This article proposes a simple copper loss minimization control algorithm to minimize copper losses of a squirrel-cage induction generator based wind energy conversion system to improve efficiency at low wind speeds. The proposed scheme does not necessitate rotor position information and an encoder. The proposed algorithm is used to find the optimum slip and stator voltage such that efficiency of the squirrel-cage induction generator is increased by minimizing the copper loss. This is particularly useful in extracting the power at low speeds, where losses form a higher percentage of input power when flux is maintained at the rated value. Especially at low wind speeds, the total copper loss can be minimized by decreasing the flux. The proposed algorithm is a simple scalar control that has the potential to reduce losses, and this has been attempted considering voltage and flux saturation limits. To validate the performance of the scheme, a comparison is made with an indirect field-oriented control scheme, in which rotor flux is maintained constant. Simulations are carried out on a typical 2-MW squirrel-cage induction generator in a MATLAB/Simulink environment (The MathWorks, Natick, Massachusetts, USA). Experimentations on 2.3-kW laboratory test setup further validate the efficacy of the proposed scheme.
A Simple Copper Loss Minimization Control Algorithm for a Grid Connected Squirrel-Cage Induction Generator Through Indirect Flux Optimization
2016
Aufsatz (Zeitschrift)
Englisch
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