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Open AccessArticle

Equivalent Modeling of Dfig-Based Wind Farms for Sub-Synchronous Resonance Analysis

Ministry of Education Key Laboratory of Modern Power System Simulation Control and Green Power Technology, Northeast Electric Power University, Jilin 132012, China
Author to whom correspondence should be addressed.
Energies 2020, 13(20), 5426;
Received: 23 September 2020 / Revised: 13 October 2020 / Accepted: 14 October 2020 / Published: 17 October 2020
(This article belongs to the Section Wind, Wave and Tidal Energy)
The order of the detailed model of doubly-fed induction generator (DFIG) wind farms are too high and the simulation is difficult. Most of the existing research has used a single-machine equivalent model and clustering aggregation model for equivalence and few papers have explored the principles and equivalent conditions of the single-machine equivalent model under sub-synchronous resonance (SSR). Due to this reason, this paper equates DFIG wind farms connected with series compensated transmission network to two separate units based on the principle of matrix similarity transformation and the mathematical model and physical model of each unit has been studied. Then, the DFIG wind farm equivalent model’s validity is analyzed in number difference and collecting line difference based on linearization analysis. Finally, the system model is built in EMTDC/PSCAD, the damping analysis method is used to test the equivalent model’s validity and further reveal the mechanism of the system’s unstable operation. The results show that: the equivalent model can effectively reduce the system dimension and accurately reflect the dominant oscillation characteristics of DFIG wind farm under SSR; when SSR occurs, the damping coefficient of DFIG wind farm is negative under the oscillation frequency. View Full-Text
Keywords: DFIG wind farm; SSR; equivalent model; similarity transformation DFIG wind farm; SSR; equivalent model; similarity transformation
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MDPI and ACS Style

Yan, G.; Wang, D.; Jia, Q.; Hu, W. Equivalent Modeling of Dfig-Based Wind Farms for Sub-Synchronous Resonance Analysis. Energies 2020, 13, 5426.

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