Impedance Aggregation Method of Multiple Wind Turbines and Accuracy Analysis

Liang Chen, Heng Nian and Yunyang Xu
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Liang Chen: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Heng Nian: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Yunyang Xu: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China

Energies, 2019, vol. 12, issue 11, 1-17

Abstract: The sequence domain impedance modeling of wind turbines (WTs) has been widely used in the stability analysis between WTs and weak grids with high line impedance. An aggregated impedance model of the wind farm is required in the system-level analysis. However, directly aggregating WT small-signal impedance models will lead to an inaccurate aggregated impedance model due to the mismatch of reference frame definitions among different WT subsystems, which may lead to inaccuracy in the stability analysis. In this paper, we analyze the impacts of the reference frame mismatch between a local small-signal impedance model and a global one on the accuracy of aggregated impedance and the accuracy of impedance-based stability analysis. The results revealed that the impact is related to the power distribution of the studied network. It was found that that the influence of mismatch on stability analysis became subtle when subsystems were balanced loaded. Considering that balanced loading is a common configuration of the practical application, direct impedance aggregation by local small-signal models can be applied due to its acceptable accuracy.

Keywords: impedance model; stability analysis; impedance aggregation; wind turbine (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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