Related references
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Summary: This paper investigates the stability issue of grid-connected voltage source converter with limits of phase locked loop. A conservative stable region of the unbounded autonomous system is derived by Lyapunov method, and it is proved that when the bounds are touched, the trajectory of the studied switched system deviates from these bounds at two fixed switching points. Furthermore, the energy of the switched system is non-increasing when the trajectories are inside the derived stable region. Based on these properties, it is proved that in order to ensure global asymptotic stability, the fixed switching points should be placed inside the derived stable region of the unbounded autonomous system. Finally, a stabilization method is proposed through the placement of fixed switching points to guarantee global asymptotic stability.
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Summary: This article investigates the impact of virtual resistance (VR) on the transient stability of virtual synchronous generator (VSG) control systems. By introducing the concepts of virtual point of common coupling and virtual power angle, a mathematical model of VSG with VR damping is established, and the stability analysis is conducted using phase portraits and attraction regions of the nonlinear system. The results reveal that the effects of VR on transient stability are different from those of real grid resistors. To ensure the normal operation of VSG with VR during grid voltage sag, an enhanced transient stability method is proposed. Theoretical analysis is validated by experimental results.
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(2022)
Article
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Bo Fan et al.
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IEEE TRANSACTIONS ON POWER SYSTEMS
(2022)
Article
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Yiyuan Lu et al.
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(2022)
Article
Engineering, Electrical & Electronic
Yingjie Tang et al.
Summary: This paper proposes an improved equal area criterion (IEAC) for transient stability analysis of a simple microgrid equipped with both grid-following and grid-forming converters. The study reveals the limitations of conventional equal area criterion (EAC) and presents IEAC to improve the estimation accuracy of stability boundaries. The impacts of system and controller parameters on transient stability are also investigated, providing useful guidelines for parameter optimization.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
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Yujun Li et al.
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IEEE TRANSACTIONS ON POWER DELIVERY
(2021)
Article
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IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
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(2021)
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