DYNAMIC EQUIVALENT MODEL OF WIND FARM FOR SHORT-CIRCUIT FAULTS ANALYSIS

Xue Yicheng; Zhang Zheren; Xu Zheng

doi:10.19912/j.0254-0096.tynxb.2020-0791

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (5) : 327-335. DOI: 10.19912/j.0254-0096.tynxb.2020-0791

DYNAMIC EQUIVALENT MODEL OF WIND FARM FOR SHORT-CIRCUIT FAULTS ANALYSIS

Xue Yicheng, Zhang Zheren, Xu Zheng

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Abstract

In order to study the dynamic characteristics of interactions between the large-scale wind farms and grid, dynamic equivalent modeling methods for wind farms has attracted extensive attention. Aiming at the existing problems that the equivalence of the wind farm collection network is relatively rough and the accuracy of equivalent models is often ignored during asymmetric faults, a dynamic equivalent modeling method, which is suitable for short-circuit fault analysis for wind farm, is proposed in the paper. Firstly, the decoupling of the collector network is carried out according to the power flow calculation results. Secondly, the modularity based K-means algorithm is adopted for clustering the wind turbine system output ac voltages to realize the optimal multi-machine aggregation. Considering the influence of distributed capacitance of the collector network, the centralized reactive compensation capacitor is set for the wind farm after aggregation. Then, in order to ensure the validity of the equivalent model during asymmetric faults, the equivalent method of zero-sequence network is proposed. Finally, the electromagnetic transient model built in the time-domain simulation software PSCAD/EMTDC verifies the effectiveness of the proposed method.

Key words

wind farm / dynamic models / K-means clustering / short-circuit currents / power flow

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Xue Yicheng, Zhang Zheren, Xu Zheng. DYNAMIC EQUIVALENT MODEL OF WIND FARM FOR SHORT-CIRCUIT FAULTS ANALYSIS[J]. Acta Energiae Solaris Sinica. 2022, 43(5): 327-335 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0791

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