Multifrequency small-signal model of voltage source converters connected to a weak grid for stability analysis

2016 ◽  
Author(s):  
Xing Li ◽  
Hua Lin
Keyword(s):  
Stability Analysis ◽  
Voltage Source ◽  
Small Signal ◽  
Voltage Source Converters ◽  
Signal Model ◽  
Weak Grid ◽  
Small Signal Model

scholarly journals Limitations of Small-Signal Modeling of Grid-Connected VSCs under Phase Jumps and Frequency Deviations

2020 ◽  
Author(s):  
Hongyang Zhang ◽  
xiongfei wang ◽  
östlund stefan
Keyword(s):  
Voltage Source ◽  
Frequency Variation ◽  
Small Signal ◽  
Voltage Source Converters ◽  
Signal Model ◽  
Small Signal Model ◽  
Frame Transformation ◽  
The Stability ◽  
Small Signal Modeling ◽  
Frequency Variations

The stability of grid-connected voltage source converters (VSCs) is commonly studied by the small-signal model in the synchronous reference (dq) frame. With phase-locked loop dynamic from VSCs, it is inevitable to convert the small-signal model to a common dq frame. When linearizing the frame transformation, the trigonometric functions of the angle are approximated by first-order terms. In this letter, the limitation of such linearization on the dq-transformation is discussed. The accuracy of the model, in presence of phase jumps and frequency variations, are examined. It is found that even under small phase jumps, mismatches are found between the small-signal model (SSM) and a nonlinear model (NM). It is further revealed that during the dynamics of frequency variation, significant mismatches can occur between the SSM and the NM.

scholarly journals Limitations of Small-Signal Modeling of Grid-Connected VSCs under Phase Jumps and Frequency Deviations

2020 ◽  
Author(s):  
Hongyang Zhang ◽  
xiongfei wang ◽  
östlund stefan
Keyword(s):  
Voltage Source ◽  
Frequency Variation ◽  
Small Signal ◽  
Voltage Source Converters ◽  
Signal Model ◽  
Small Signal Model ◽  
Frame Transformation ◽  
The Stability ◽  
Small Signal Modeling ◽  
Frequency Variations

The stability of grid-connected voltage source converters (VSCs) is commonly studied by the small-signal model in the synchronous reference (dq) frame. With phase-locked loop dynamic from VSCs, it is inevitable to convert the small-signal model to a common dq frame. When linearizing the frame transformation, the trigonometric functions of the angle are approximated by first-order terms. In this letter, the limitation of such linearization on the dq-transformation is discussed. The accuracy of the model, in presence of phase jumps and frequency variations, are examined. It is found that even under small phase jumps, mismatches are found between the small-signal model (SSM) and a nonlinear model (NM). It is further revealed that during the dynamics of frequency variation, significant mismatches can occur between the SSM and the NM.

Divided DQ Small-Signal Model: A New Perspective for the Stability Analysis of Three-Phase Grid-Tied Inverters

2019 ◽  
Vol 66 (8) ◽  
pp. 6493-6504 ◽  
Author(s):  
Zhikang Shuai ◽  
Yang Li ◽  
Weimin Wu ◽  
Chunming Tu ◽  
An Luo ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Small Signal ◽  
Signal Model ◽  
Small Signal Model ◽  
Three Phase ◽  
New Perspective ◽  
The Stability
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