scholarly journals Dynamic modeling and stability analysis of power networks using dq0 transformations with a unified reference frame

2018 ◽  
Vol 65 (4) ◽  
pp. 368
Author(s):  
J Belikov ◽  
Y Levron
Keyword(s):  
Stability Analysis ◽  
Reference Frame ◽  
Dynamic Modeling ◽  
Power Networks

scholarly journals Impedance Aggregation Method of Multiple Wind Turbines and Accuracy Analysis

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2035 ◽  
Author(s):  
Liang Chen ◽  
Heng Nian ◽  
Yunyang Xu
Keyword(s):  
Stability Analysis ◽  
Reference Frame ◽  
Wind Turbines ◽  
Power Distribution ◽  
Wind Farm ◽  
System Level ◽  
Small Signal ◽  
Impedance Model ◽  
The Stability ◽  
The Impact

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.

Dynamic modeling, testing, and stability analysis of an ornithoptic blimp

2011 ◽  
Vol 8 (4) ◽  
pp. 375-386 ◽  
Author(s):  
John Dietl ◽  
Thomas Herrmann ◽  
Gregory Reich ◽  
Ephrahim Garcia
Keyword(s):  
Stability Analysis ◽  
Dynamic Modeling
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