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Stability Enhancement of Bi-Directional Voltage Source Converters in Modern Power Systems
  • MohamadAmin Ghasemi,
  • Seyed Fariborz Zarei,
  • Saeed Peyghami (GE)
MohamadAmin Ghasemi
Bu Ali Sina University

Corresponding Author:ma.ghasemi@basu.ac.ir

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Seyed Fariborz Zarei
Qom University of Technology
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Saeed Peyghami (GE)
Aalborg Universitet
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Abstract

In future modern power systems, reliability and resilience could be an extreme challenge caused by the stability issues of the bidirectional power converters (BPCs). The non-linear dynamics of DC link voltage (DCLV) of BPCs in interaction with the existing linear control schemes may decrease the stability margin and cause operating-point-dependent instability issues. Existing approaches may solve this issue by reducing the DCLV control loop bandwidth, which considerably degrades the system performance. To tackle this issue, first, the root cause of the instability challenge is analytically investigated, and then, a non-linear stabilizer control scheme based on Lyapunov theorem is proposed. Considering the non-linear dynamic of the BPCs and the interaction between dynamics of DC link voltage and AC currents in the proposed stabilizer, it guarantees the stability of the converter in both directions of power flow and the full range of loading conditions. The performance of the proposed scheme is verified through simulation of the system under various operating conditions, considering uncertainties, disturbances, and short-circuit events, and comparing it with that of prevalent controllers.
25 Jan 2023Submitted to IET Generation, Transmission & Distribution
30 Jan 2023Submission Checks Completed
30 Jan 2023Assigned to Editor
27 Feb 2023Reviewer(s) Assigned
13 Mar 2023Review(s) Completed, Editorial Evaluation Pending
14 Mar 2023Editorial Decision: Revise Major
10 Apr 20231st Revision Received
16 Apr 2023Submission Checks Completed
16 Apr 2023Assigned to Editor
16 Apr 2023Reviewer(s) Assigned
24 Apr 2023Review(s) Completed, Editorial Evaluation Pending
25 Apr 2023Editorial Decision: Accept