An Improved Impedance/Admittance Analysis Method Considering Collector Subsystem Transformation in Converter-Integrated Power Systems

Wang, Chenxuan; Wang, Zhen; Wu, Qiuwei; Xin, Huanhai

doi:10.1109/tpwrs.2021.3107715

Cited by 7 publications

(3 citation statements)

References 6 publications

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“…Figure 5 illustrates the multi-paralleled DFIG WFs consisting of the jth and kth WFs [19], [23]. In Fig.…”

Section: A Dynamic Coupling Between Wfsmentioning

confidence: 99%

Dynamic Coupling and Cooperative Control for Multi-Paralleled Doubly Fed Induction Generator Wind Farms During Symmetrical Low Voltage Ride-Through in a Weak Grid

Guan,

Yao

2024

Prot. Control Mod. Power Syst.

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In multi-fed grid-connected systems, there are complex dynamic interactions between different pieces of equipment. Particularly in situations of weak-grid faults, the dynamic coupling between equipment becomes more pronounced. This may cause the system to experience small-signal instability during the fault steady-state. In this paper, multi-paralleled doubly fed induction generator (DFIG)-based wind farms (WFs) are taken as an example to study the dynamic coupling within a multi-fed system during fault steady-state of symmetrical low voltage ride-through (LVRT) in a weak grid. The analysis reveals that the dynamic coupling between WFs will introduce a damping shift to each WF. This inevitably affects the system's dynamic stability and brings the risk of small-signal instability during fault steady-state in LVRT scenarios. Increasing the distance to fault location and fault severity will exacerbate the dynamic coupling between WFs. Because of the dynamic coupling, adjusting the control state of one WF will affect the stability of the remaining WFs in the system. Hence, a cooperative control strategy for multi-paralleled DFIG WFs is proposed to improve dynamic stability during LVRT. The analysis and the effectiveness of the proposed control strategy are verified by modal analysis and simulation.

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“…Figure 5 illustrates the multi-paralleled DFIG WFs consisting of the jth and kth WFs [19], [23]. In Fig.…”

Section: A Dynamic Coupling Between Wfsmentioning

confidence: 99%

Dynamic Coupling and Cooperative Control for Multi-Paralleled Doubly Fed Induction Generator Wind Farms During Symmetrical Low Voltage Ride-Through in a Weak Grid

Guan,

Yao

2024

Prot. Control Mod. Power Syst.

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“…The system topology and all operational data can be found in [20]. Details of the wind farm system such as the controller structure and parameters can be referred to in [21]. In Fig.…”

Section: Case Studiesmentioning

confidence: 99%

Partition-based Network Equivalent Method for Power System Subsynchronous Oscillation Analysis

Wang,

Zheng,

Wang

et al. 2024

Journal of Modern Power Systems and Clean Energy

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Given large-scale modern power systems with power electronic converters, the numerical simulation with subsynchronous oscillation (SSO) faces great challenges in engineering practice due to sharply enlarged modeling scale and high computational burden. To reduce the modeling scale, network partition and equivalent becomes a vital technique in numerical simulations. Although several methods have been developed for network equivalent, a generally accepted rule for network partition is still required. This paper proposes that the system can be partitioned into three parts, i. e., the internal, the middle, and the external subsystems, in which the internal subsystem consists of all power electronic components, the middle subsystem includes those selected AC dynamic components with detailed models, and the remaining components and buses constitute the external subsystem. The external subsystem is further represented by an equivalent RLC network determined by the frequency dependent network equivalent (FDNE) method. In the proposed method, the observability index and the electrical distance index are used to identify the interface between the middle and the external subsystems. Case studies based on a modified Hydro-Quebec system are used to verify the effectiveness of the proposed method.

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“…Another simpler approach to aggregate wind farms is presented and evaluated by Kunjumuhammed, Pal, Oates et al (2017), where the wind turbines are grouped per string in order to keep the representation of medium frequency oscillations. Also, Wang et al (2021) presents a method to aggregate the wind farm collector grid as a radial configuration in order to facilitate the impedance-based analysis.…”

Section: Promising Analysis Trendsmentioning

confidence: 99%

Modeling and analysis approaches for small‐signal stability assessment of power‐electronic‐dominated systems

Cheah-Mañé

Egea‐Àlvarez

Prieto‐Araujo

et al. 2022

WIREs Energy & Environment

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The stability, operation, and control of power networks have been challenged due to the increased penetration of power electronic converters. New instability phenomena have appeared due to the interaction of the power converter controllers with other power network elements, including other power converters. Small-signal tools have been proved effective to identify and mitigate stability issues but their development is still ongoing. This article presents the state of the art on small-signal modeling and stability assessment of converterdominated networks. The modeling of converters and other power system components is reviewed, as well as the most common small-signal analysis techniques employed in conventional and modern power systems with power electronics. Two case studies are introduced to exemplify the modeling and stability analysis, employing some of the techniques presented in the article.

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An Improved Impedance/Admittance Analysis Method Considering Collector Subsystem Transformation in Converter-Integrated Power Systems

Cited by 7 publications

References 6 publications

Dynamic Coupling and Cooperative Control for Multi-Paralleled Doubly Fed Induction Generator Wind Farms During Symmetrical Low Voltage Ride-Through in a Weak Grid

Dynamic Coupling and Cooperative Control for Multi-Paralleled Doubly Fed Induction Generator Wind Farms During Symmetrical Low Voltage Ride-Through in a Weak Grid

Partition-based Network Equivalent Method for Power System Subsynchronous Oscillation Analysis

Modeling and analysis approaches for small‐signal stability assessment of power‐electronic‐dominated systems

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