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| Content Provider | IET Digital Library |
|---|---|
| Author | Shifeng, Zhang Yunlei, Yang Xiao, Chang Min, Zhang Shengwen, Li Jinhao, Wang Da, Lei Huipeng, Li Long, Xu |
| Abstract | With the increase of capacity and the improvement of economy, doubly-fed induction generator (DFIG) is gradually becoming the most widely used wind power generator in the world. DFIG has different characteristics of transient operation from the synchronous generator and its short-circuit current is affected by the converter control mode, thus when there is a voltage sags occurs, the short-circuit current of the wind farm may contain a certain amount of two harmonic. Power transformer is one of the most important power equipment in power system and the normal or not of transformer protection determines the safe and stable operation of power system. At present, the main protection of transformer is longitudinal differential protection. In order to correctly identify the inrush current, it is usually equipped with two harmonic braking measures to ensure the reliable operation of differential protection. Therefore, when the transformer failure occurs in wind farm, the protection may refuse to operate due to the reason that the short-circuit current contains a certain amount of two harmonic. Focused on the large-scale application of DFIG and the lack of the short-circuit current harmonic characteristics analysis, this work is devoted to the study of two harmonic characteristics and their influence on transformer protection when the grid voltage occurs in a non-depth drop. Through the analysis of the short-circuit current, harmonic components under different control modes of converter research the characteristics and production mechanism of the two harmonic currents of the doubly-fed wind power generator. This also lays a solid foundation for the improvement of transformer protection. Finally, the correctness of the analysis is verified by the experiments of short-circuit and time-domain simulation. |
| Starting Page | 996 |
| Ending Page | 1001 |
| Page Count | 6 |
| Volume Number | 2017 |
| e-ISSN | 20513305 |
| Issue Number | Issue 13, Jan (2017) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/joe/2017/13 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/joe.2017.0479 |
| Journal | The Journal of Engineering |
| Publisher | The Institution of Engineering and Technology |
| Publisher Date | 2017-01-01 |
| Access Restriction | Open |
| Rights License | Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/) |
| Subject Keyword | Asynchronous Generator Asynchronous Machine Converter Control Mode DFIG Doubly Fed Induction Generator Failure Analysis Grid Voltage Harmonic Analysis Harmonic Braking Harmonics Inrush Current Identification Longitudinal Differential Protection Mathematical Analysis Nondepth Drop Power Converter Power Equipment Power Generation Protection Power Generation Reliability Power Grid Power Supplies to Apparatus Power Supply Quality Power System Protection Power System Stable Operation Power Transformer Power Transformer Protection Reliability Short Circuit Current Harmonic Analysis Short-circuit Current Short-circuit Current Harmonic Characteristic Analysis Short-circuit Current Harmonic Component Analysis Solid Foundation Synchronous Generator Time Domain Analysis Time-domain Simulation Transformer And Reactors Transformer Failure Transformer Protection Transient Operation Characteristic Voltage Sag Wind Farm Wind Power Generator Wind Power Plant |
| Content Type | Text |
| Resource Type | Article |
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