An optimum three-stage stator winding connections for wind-driven stand-alone self-excited induction generators for enhanced annual energy output
| Autor: | R. Essaki Raj, R. Karthigaivel, C. Kamalakannan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Battery (electricity)
Stator 020209 energy Applied Mathematics 020208 electrical & electronic engineering Induction generator 02 engineering and technology Power factor Wind speed law.invention Generator (circuit theory) Control theory law Physics::Space Physics 0202 electrical engineering electronic engineering information engineering Astrophysics::Solar and Stellar Astrophysics Equivalent circuit Electrical and Electronic Engineering Physics::Atmospheric and Oceanic Physics Energy (signal processing) Mathematics |
| Zdroj: | Electrical Engineering. 103:865-880 |
| ISSN: | 1432-0487 0948-7921 |
| Popis: | A special three-phase stator winding consisting of a parallel combination of delta and star is proposed for wind-driven, self–excited induction generators (SEIGs), increasingly used for supplying isolated loads. This winding configuration enables the SEIG to be operated over a wide range of wind speeds, in three stages. The winding is set at parallel delta-star connection at higher wind speeds and then changed to conventional series delta and series star connections at medium and low wind speeds, respectively. An equivalent circuit has been developed for SEIG with this unconventional winding, and the expressions for the evaluation of its performance characteristics have been derived. A method of determining a suitable value of excitation capacitor bank has also been formulated using genetic algorithm. Taking an example of a 2.2 kW, three-phase SEIG, its predetermined characteristics and the corresponding experimental results have been presented. Taking the wind data from an actual wind farm, the annual energy output obtainable from this generator is also estimated. The proposed switching scheme is thus shown to be optimum for covering a wide range of wind speeds. A cluster of several such generators can lead to the establishment of battery charging stations and formation of micro-grids. |
| Databáze: | OpenAIRE |
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