Model Reduction of DFIG Wind Turbine System Based on Inner Coupling Analysis
The doubly-fed induction generator (DFIG) wind turbine system, which is composed of the wind turbine, generator, rotor-side converter, grid-side converter, and so on, is a typical multi-time scale system. The dynamic processes at different time scales do not exist in isolation. Furthermore, neglecti...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-11-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/11/11/3234 |
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| author | Pingping Han Yu Zhang Lei Wang Yan Zhang Zihao Lin |
| author_facet | Pingping Han Yu Zhang Lei Wang Yan Zhang Zihao Lin |
| author_sort | Pingping Han |
| collection | DOAJ |
| description | The doubly-fed induction generator (DFIG) wind turbine system, which is composed of the wind turbine, generator, rotor-side converter, grid-side converter, and so on, is a typical multi-time scale system. The dynamic processes at different time scales do not exist in isolation. Furthermore, neglecting the coupling of parameters of different time scales to reduce the order of the model will lead to deviation between the simulation results and the actual results, which may not be suitable for power system transient analysis. This paper proposes an electromechanical transient model and an electromagnetic transient model of the DFIG wind turbine system that consider the interaction of multiple time-scale dynamic processes. Firstly, the paper applies the modal analysis method to explain the multi-time scale characteristics of the DFIG wind turbine system. Secondly, the variation in the eigenvalues of the DFIG wind turbine system before and after the order reduction and the coupling between variables and the system, as well as the coupling between variables of different time scales, are analyzed to obtain the preliminary 21-order simplified model. Thirdly, considering the weak coupling characteristics between the mechanical part and the electromagnetic part of the DFIG wind turbine system, the 21-order simplified model is decomposed into a 15-order electromagnetic transient model and a six-order electromechanical transient model on the basis of their time scales. Then, according to the balance between simulation time and simulation accuracy, the 14-order electromagnetic transient model and the 10 or 12-order electromechanical transient model are finally obtained. Finally, the rationality of the simplified models is verified by simulations under two large disturbance conditions, namely wind speed abrupt change and voltage sag. The obtained simplified models have reference significance for improving the simulation speed of a wind power grid-connected system and analyzing the internal mechanism of the DFIG wind turbine system’s stability. |
| first_indexed | 2024-04-11T22:31:30Z |
| format | Article |
| id | doaj.art-d772cdd9aa144cc5aa8949b30de9ef86 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-04-11T22:31:30Z |
| publishDate | 2018-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-d772cdd9aa144cc5aa8949b30de9ef862022-12-22T03:59:23ZengMDPI AGEnergies1996-10732018-11-011111323410.3390/en11113234en11113234Model Reduction of DFIG Wind Turbine System Based on Inner Coupling AnalysisPingping Han0Yu Zhang1Lei Wang2Yan Zhang3Zihao Lin4Anhui Provincial Laboratory of New Energy Utilization and Energy Conservation, Hefei University of Technology, Hefei 230009, ChinaAnhui Provincial Laboratory of New Energy Utilization and Energy Conservation, Hefei University of Technology, Hefei 230009, ChinaAnhui Provincial Laboratory of New Energy Utilization and Energy Conservation, Hefei University of Technology, Hefei 230009, ChinaAnhui Provincial Laboratory of New Energy Utilization and Energy Conservation, Hefei University of Technology, Hefei 230009, ChinaAnhui Provincial Laboratory of New Energy Utilization and Energy Conservation, Hefei University of Technology, Hefei 230009, ChinaThe doubly-fed induction generator (DFIG) wind turbine system, which is composed of the wind turbine, generator, rotor-side converter, grid-side converter, and so on, is a typical multi-time scale system. The dynamic processes at different time scales do not exist in isolation. Furthermore, neglecting the coupling of parameters of different time scales to reduce the order of the model will lead to deviation between the simulation results and the actual results, which may not be suitable for power system transient analysis. This paper proposes an electromechanical transient model and an electromagnetic transient model of the DFIG wind turbine system that consider the interaction of multiple time-scale dynamic processes. Firstly, the paper applies the modal analysis method to explain the multi-time scale characteristics of the DFIG wind turbine system. Secondly, the variation in the eigenvalues of the DFIG wind turbine system before and after the order reduction and the coupling between variables and the system, as well as the coupling between variables of different time scales, are analyzed to obtain the preliminary 21-order simplified model. Thirdly, considering the weak coupling characteristics between the mechanical part and the electromagnetic part of the DFIG wind turbine system, the 21-order simplified model is decomposed into a 15-order electromagnetic transient model and a six-order electromechanical transient model on the basis of their time scales. Then, according to the balance between simulation time and simulation accuracy, the 14-order electromagnetic transient model and the 10 or 12-order electromechanical transient model are finally obtained. Finally, the rationality of the simplified models is verified by simulations under two large disturbance conditions, namely wind speed abrupt change and voltage sag. The obtained simplified models have reference significance for improving the simulation speed of a wind power grid-connected system and analyzing the internal mechanism of the DFIG wind turbine system’s stability.https://www.mdpi.com/1996-1073/11/11/3234DFIG wind turbine systemcoupling characteristic analysismodel reductionelectromechanical transient modelelectromagnetic transient model |
| spellingShingle | Pingping Han Yu Zhang Lei Wang Yan Zhang Zihao Lin Model Reduction of DFIG Wind Turbine System Based on Inner Coupling Analysis Energies DFIG wind turbine system coupling characteristic analysis model reduction electromechanical transient model electromagnetic transient model |
| title | Model Reduction of DFIG Wind Turbine System Based on Inner Coupling Analysis |
| title_full | Model Reduction of DFIG Wind Turbine System Based on Inner Coupling Analysis |
| title_fullStr | Model Reduction of DFIG Wind Turbine System Based on Inner Coupling Analysis |
| title_full_unstemmed | Model Reduction of DFIG Wind Turbine System Based on Inner Coupling Analysis |
| title_short | Model Reduction of DFIG Wind Turbine System Based on Inner Coupling Analysis |
| title_sort | model reduction of dfig wind turbine system based on inner coupling analysis |
| topic | DFIG wind turbine system coupling characteristic analysis model reduction electromechanical transient model electromagnetic transient model |
| url | https://www.mdpi.com/1996-1073/11/11/3234 |
| work_keys_str_mv | AT pingpinghan modelreductionofdfigwindturbinesystembasedoninnercouplinganalysis AT yuzhang modelreductionofdfigwindturbinesystembasedoninnercouplinganalysis AT leiwang modelreductionofdfigwindturbinesystembasedoninnercouplinganalysis AT yanzhang modelreductionofdfigwindturbinesystembasedoninnercouplinganalysis AT zihaolin modelreductionofdfigwindturbinesystembasedoninnercouplinganalysis |