| Autor: |
Scholey, Alexander, Gierschner, Magdalena, Jeinsch, Torsten |
| Předmět: |
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| Zdroj: |
Digital Proceedings of the Virtual '19th International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Power Plants'; 2019, p1-6, 6p |
| Abstrakt: |
This article addresses the problem of state estimation. In general, not all process states of control systems are measured, so state estimation can provide additional information during the run-time. Typically, observers are used to fulfil this task. The paper focuses on a wind energy system with LCL filter and an observer is applied to estimate the grid current of the filter. The observer model is characterized by several features to suit the application best. First, it treats the grid current as a harmonic signal, which corresponds to the ideal case. An extension of the observer takes higher-order harmonics into account as well. Lastly, a change of frequency of the grid current is considered, which leads to a non-linear observer. Therefore, the stability properties have to be analysed with a non-linear theory, and for this Lyapunov's theory is applied. Numerical simulations of the proposed observers are carried out to prove the effectiveness and for comparison. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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