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

Shaojian Song, Peichen Guan, Bin Liu, Yimin Lu and Huihwang Goh
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Shaojian Song: School of Electrical Engineering, Guangxi University, Nanning 530004, China
Peichen Guan: School of Electrical Engineering, Guangxi University, Nanning 530004, China
Bin Liu: School of Electrical Engineering, Guangxi University, Nanning 530004, China
Yimin Lu: School of Electrical Engineering, Guangxi University, Nanning 530004, China
Huihwang Goh: School of Electrical Engineering, Guangxi University, Nanning 530004, China

Energies, 2021, vol. 14, issue 11, 1-22

Abstract: 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.

Keywords: DFIG; impedance modeling; harmonic stability; frequency coupling; sub-synchronous oscillation (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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