Cascading Synchronization Instability in Multi-VSC Grid-Connected System

Fu, Xikun; Huang, Meng; Pan, Shangzhi; Zha, Xiaoming

doi:10.1109/tpel.2022.3153283

Cited by 25 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The PLL interactions in a weak grid-tied parallel VSCs system increase, resulting in instability; however, reduced PLL bandwidth [22] and an improved notch filter ensure stability [23]. In parallel VSCs, the interactions from the inner current control loop and parallel VSCs influence synchronization and stability [24]; moreover, one VSC suffers from the interaction effects of the other at the PCC [25]. In parallel VSCs, the dynamic coupling under asymmetrical fault [26] and a weak grid [27] increases interactions, decreasing damping and resulting in instability.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Interactions and Stabilization of Weak Grid-Tied Parallel VSCs and Parallel CSCs Systems Considering PVG Dynamic Resistance

Rahman,

Mohamed

2024

IEEE Open J. Power Electron.

View full text Add to dashboard Cite

The parallel operation of power converters is essential to meet increased power demands. However, due to dynamic coupling, the instability in one converter can affect the stability of another. Therefore, this paper analyses the interaction and stability differences among the weak grid-tied photovoltaic (PV)-interfaced parallel voltage-and current-source converters (VSCs and CSCs) considering the PV generator (PVG) dynamics. Moreover, the impacts of the changing PVG operating points from the constant-voltage to a constant-current region (CVR to a CCR) and changing control parameters on converters' dynamic interaction are studied and compared in both cases. It is found that parallel VSCs dc-links suffer from low-frequency (<60 Hz) compared to high-frequency oscillations (>200 Hz) in parallel CSCs at the CCR with a short-circuit ratio (SCR) of 2.5. Moreover, the oscillation magnitude of injected power is higher in parallel VSCs compared to the parallel CSCs at SCR=1.2. Therefore, a stabilization method is proposed for both systems to ensure reduced interactions and stable operation in the CVR, CCR, and maximum power regions at weak and very weak grid conditions. Finally, the proposed compensators' efficacy is validated via detailed nonlinear time-domain and real-time simulation results.

show abstract

Section: Introductionmentioning

confidence: 99%

Dynamic Interactions and Stabilization of Weak Grid-Tied Parallel VSCs and Parallel CSCs Systems Considering PVG Dynamic Resistance

Rahman,

Mohamed

2024

IEEE Open J. Power Electron.

View full text Add to dashboard Cite

show abstract

“…[6] analyzed the mechanism of how DFIGWTs affect the stability of the SG in a single-machine infinite-bus system using EAC. Recent studies [7,8] were also devoted to the transient stability analysis of the voltage source converter (VSC) by EAC. VSCs were regarded as simplified models of renewable power generators in these studies.…”

Section: Introductionmentioning

confidence: 99%

Estimating the region of attraction of wind integrated power systems based on improved expanding interior algorithm

Liu,

Yao,

Chen

et al. 2024

IET Generation Trans & Dist

View full text Add to dashboard Cite

This paper proposes an improved expanding interior algorithm (EIA) to estimate the region of attraction (ROA) of power systems with wind power generation based on sum of squares (SOS) programming. An ordinary differential equation (ODE) model is derived for the doubly‐fed induction generator‐based wind turbine (DFIGWT), which is named as an enhanced synchronous‐generator‐mimicking (ESGM) model. The ESGM model bridges the gap between the requirement of an ODE model in ROA estimation and the conventional differential‐algebraic equation (DAE) model of the DFIGWT system. The ESGM model is able to accurately reflect the low frequency dynamics of the DFIGWT. Moreover, an improved EIA is designed to estimate the ROA based on SOS programming, which has higher efficiency than the existing ROA estimation algorithms based on SOS programming. It is able to adaptively search for the Lyapunov function and obtain an optimal estimation of the ROA in an iterative process. The accuracy and efficiency of this algorithm are verified in three test systems composed of DFIGWTs and synchronous generators (SGs). The morphological changes in the ROA of the test systems caused by the penetration of DFIGWT are examined.

show abstract

“…Their applications are frequently seen in control of power electronic devices for power systems, 3 microgrid and sustainable energy systems, [4][5][6][7] electric drives, 8,9 and grid synchronization. [10][11][12] A significant application of Clarke transformation is seen in the definition of instantaneous reactive power presented by Akagi et al 13 Transformations from abc to dq0 and αβ0 have been derived in various ways in the history and have been reviewed in O'Rourke et al 14 The Clarke transformation was originally arrived at using the symmetrical components, and Park transformation was derived trigonometrically. A geometric approach of the derivation is also presented in O'Rourke et al 14 The work in this paper is based on the trigonometric approach.…”

Section: Introductionmentioning

confidence: 99%

“…Although these transformations were originally developed for analyzing the dynamic models of electrical machines, they now extend to many other applications in power engineering other than the specific applications for which they were developed. Their applications are frequently seen in control of power electronic devices for power systems, 3 microgrid and sustainable energy systems, 4–7 electric drives, 8,9 and grid synchronization 10–12 . A significant application of Clarke transformation is seen in the definition of instantaneous reactive power presented by Akagi et al 13 …”

Section: Introductionmentioning

confidence: 99%

A visual understanding of electrical transformations and generalized abc to αβ0 and dq0 transformation

Madnani

Mishra

2022

Circuit Theory & Apps

View full text Add to dashboard Cite

Summary Varied control applications in electrical engineering find the utility of the theory of transformation of three‐phase quantities from abc to αβ0 and dq0 reference frames. These transformations are vital in simplifying the control equations and their implementation. However, for different applications, different orientations of the abc‐, αβ‐, and dq‐axes are used. This results in a different transformation matrix for each such orientation. In this paper, a generalized abc to αβ0 and dq0 transformation matrix is proposed which can be utilized for any possible orientation and thus effectuates faster derivation of the transformation matrix. This is achieved by defining two parameters l and m whose values are obtained by observing the orientation of the axes. The transformation equation can therefore be obtained without having to undergo the steps of resolving abc quantities into their components along the αβ‐ or dq‐axes. Furthermore, this paper discusses the visual understanding of transformed electrical quantities. It is shown that the complex plots of real versus imaginary parts of instantaneous positive and negative symmetrical components have shapes which exhibit specific characteristics of electrical quantities and give a direct understanding about unbalance and presence of harmonics in the system.

show abstract

Cascading Synchronization Instability in Multi-VSC Grid-Connected System

Cited by 25 publications

References 6 publications

Dynamic Interactions and Stabilization of Weak Grid-Tied Parallel VSCs and Parallel CSCs Systems Considering PVG Dynamic Resistance

Dynamic Interactions and Stabilization of Weak Grid-Tied Parallel VSCs and Parallel CSCs Systems Considering PVG Dynamic Resistance

Estimating the region of attraction of wind integrated power systems based on improved expanding interior algorithm

A visual understanding of electrical transformations and generalized abc to αβ0 and dq0 transformation

Contact Info

Product

Resources

About