Impedance Modeling and Stability Analysis of the Cascaded Three-phase Symmetric Systems Using Complex Transfer Functions

2018 ◽  
Author(s):  
Teng Liu ◽  
Zeng Liu ◽  
Jinjun Liu ◽  
Yiming Tu ◽  
Zipeng Liu
Keyword(s):  
Stability Analysis ◽  
Transfer Functions ◽  
Three Phase ◽  
Impedance Modeling ◽  
Symmetric Systems

Harmonic Transfer-Function-Based Impedance Modeling of a Three-Phase VSC for Asymmetric AC Grid Stability Analysis

2019 ◽  
Vol 34 (12) ◽  
pp. 12552-12566 ◽  
Author(s):  
Chen Zhang ◽  
Marta Molinas ◽  
Atle Rygg ◽  
Jing Lyu ◽  
Xu Cai
Keyword(s):  
Stability Analysis ◽  
Transfer Function ◽  
Three Phase ◽  
Impedance Modeling

SISO Transfer Functions for Stability Analysis of Grid-Connected Voltage-Source Converters

2019 ◽  
Vol 55 (3) ◽  
pp. 2931-2941 ◽  
Author(s):  
Hongyang Zhang ◽  
Xiongfei Wang ◽  
Lennart Harnefors ◽  
Hong Gong ◽  
Jean-Philippe Hasler ◽  
...  
Keyword(s):  
Stability Analysis ◽  
Transfer Functions ◽  
Voltage Source ◽  
Voltage Source Converters

scholarly journals Impedance Modeling and Stability Analysis of DFIG-Based Wind Energy Conversion System Considering Frequency Coupling

Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3243
Author(s):  
Shaojian Song ◽  
Peichen Guan ◽  
Bin Liu ◽  
Yimin Lu ◽  
HuiHwang Goh
Keyword(s):  
Stability Analysis ◽  
Coupling Effect ◽  
Impedance Model ◽  
Wind Energy Conversion ◽  
Proposed Model ◽  
New Type ◽  
Impedance Modeling ◽  
Frequency Coupling ◽  
Bus Voltage ◽  
Voltage Dynamics

Impedance-based stability analysis is an effective method for addressing a new type of SSO accidents that have occurred in recent years, especially those caused by the control interaction between a DFIG and the power grid. However, the existing impedance modeling of DFIGs is mostly focused on a single converter, such as the GSC or RSC, and the influence between the RSC and GSC, as well as the frequency coupling effect inside the converter are usually overlooked, reducing the accuracy of DFIG stability analysis. Hence, the entire impedance is proposed in this paper for the DFIG-based WECS, taking coupling factors into account (e.g., DC bus voltage dynamics, asymmetric current regulation in the dq frame, and PLL). Numerical calculations and HIL simulations on RT-Lab were used to validate the proposed model. The results indicate that the entire impedance model with frequency coupling is more accurate, and it is capable of accurately predicting the system’s possible resonance points.

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