Autonomous power system for island or grid-connected wind turbines in distributed generation
| Autor: | Grzegorz Iwanski, W. Koczara |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Engineering
Wind power business.industry Rotor (electric) Induction generator Electrical engineering Energy Engineering and Power Technology AC power law.invention Electric power system Electricity generation law Control theory Distributed generation Power electronics Electrical and Electronic Engineering business |
| Zdroj: | European Transactions on Electrical Power. 18:658-673 |
| ISSN: | 1546-3109 1430-144X |
| DOI: | 10.1002/etep.256 |
| Popis: | Modern power generation systems for wind turbines are often based on the rotor fed slip-ring machines. Power electronics converter provides the slip power, and also the reactive power for excitation of the generator during standalone operation. This way the isolated load can be supplied even if the grid has failed. Stator voltage in an autonomous operation is controlled using vectorial phase locked loop (PLL) structure; therefore the information about mechanical speed or angular position of the rotor is eliminated from the control method. The second PLL is also used for synchronization of the generated voltage with the grid voltage. Voltages synchronization is necessary for soft connection and protection of the supplied load from the rapid change of the supply voltage phase. The grid-connected doubly fed induction generator (DFIG) can be useful after grid fault; however, the mains outage detection methods are necessary for fast disconnection after grid failures. Copyright © 2008 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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