Journal Article10.1109/TPEL.2021.3066205
Optimal Controller Design for Transient Stability Enhancement of Grid-Following Converters Under Weak-Grid Conditions
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TL;DR: A systematic analysis procedure of a grid-following converter under weak-grid conditions and large-signal disturbances including the outer dc-link and ac-side voltage control loops is proposed and a recommendation and a design guideline for converter constraints and outer-loop controller parameters are given.
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Abstract: Modeling and design-oriented control of transient stability of grid-following converters have attained an increasing interest in recent years. Despite novel nonlinear models enabling a design-oriented enhanced transient stability controller, the focus has so far been limited to study only the synchronization dynamics of the phase-locked loop. To expand upon the knowledge of the large-signal performance and stability, this article proposes a systematic analysis procedure of a grid-following converter under weak-grid conditions and large-signal disturbances including the outer dc-link and ac-side voltage control loops. A reduced-order large-signal model is used to analyze the large-signal nonlinear behavior of the system using the area of the basin of attraction as a measure for large-signal robustness. Here, stabilizing and destabilizing trends for outer-loop controller parameters are given. Through a surrogate-model expensive black-box optimization algorithm, a computational-efficient optimal design of the outer-loop controller parameters is proposed to maximize the large-signal robustness. Finally, a recommendation and a design guideline for converter constraints and outer-loop controller parameters are given. This can be used to identify the influencing parameters for grid-following converters under large-signal disturbances, and as a tool for fast controller optimization toward large-signal robustness.
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Citations
Issues and Challenges of Grid-Following Converters Interfacing Renewable Energy Sources in Low Inertia Systems: A Review
Rafat Aljarrah,Bayan H. Bany Fawaz,Qusay Salem,Mazaher Karimi,Hesamoddin Marzooghi,Rasoul Azizipanah-Abarghooee +5 more
TL;DR: GFL converters heavily depend on the presence of SGs for stable operation, and their limitations in low inertia systems hinder the integration of RESs.
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Transient Stability Analysis of Grid-Following VSCs Considering Voltage-Dependent Current Injection During Fault Ride-Through
TL;DR: In this article , the transient stability of grid-following voltage source converters (GFL-VSCs) considering the voltage-dependent current injection (VDCI) dynamics during fault ride-through (FRT) was analyzed.
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Hybrid Control Scheme for VSC Presenting Both Grid-Forming and Grid-Following Capabilities
01 Dec 2022
TL;DR: In this article , a hybrid control converter (HCC) is proposed to mimic the behavior of two individual virtual converters working in parallel (one with grid following and the other with grid-forming control) for autonomous connection of multiple distinct AC systems using a meshed DC transmission system.
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Transient Stability Analysis of Grid-Following VSCs Considering Voltage-Dependent Current Injection During Fault Ride-Through
TL;DR: In this article , the transient stability of grid-following voltage source converters (GFL-VSCs) considering the voltage-dependent current injection (VDCI) dynamics during fault ride-through (FRT) was analyzed.
12
Robust Control of GTIs under wide grid impedance ranges: An approach combining metaheuristics and LMIs
Lucas Cielo Borin,Caio Ruviaro Dantas Osório,Gustavo Guilherme Koch,Ricardo C. L. F. Oliveira,Vinicius F. Montagner +4 more
TL;DR: In this article , the authors proposed a new design procedure for robust state feedback current controllers suitable for grid-tied inverters under wide grid impedance ranges, which is based on the combination of particle swarm optimization and linear matrix inequalities.
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