Intentional power system islanding under cascading outages using energy function method

Kamali, Sadegh; Amraee, Turaj; Khorsand, Mojdeh

doi:10.1049/iet-gtd.2019.0317

Cited by 10 publications

(3 citation statements)

References 33 publications

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“…Formula ( 22) multiplied by a scale factor is approximately equal to the actual noise covariance, and the scale factor will not have any impact on the application. Therefore, the noise covariance matrix can be obtained by the following formula [23]:…”

Section: Reliability Estimation Of Non-rigid Body Deformation Degreementioning

confidence: 99%

Reconstruction of 3D Non-Rigid Moving Human Targets Based on Reliable Estimation of Contour Deformation Degree

Zhang,

Baza,

Alshahrani

2024

IEEE Access

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The human body is a typical non-rigid object, and its 3D reconstruction is a classic problem in the field of computer vision. Due to the inherent complexity and dynamism of the human body, it is not suitable for existing non-rigid 3D motion reconstruction algorithms that assume that the number of shape bases of non-rigid bodies is known. The number of shape bases is very important for 3D reconstruction methods. If the number of shape bases is estimated incorrectly in contour deformation estimation, it can lead to unreliable or even complete failure of the reconstruction algorithm. Therefore, this paper designs a 3D non-rigid motion human object reconstruction algorithm based on reliable estimation of contour deformation degree. This algorithm leverage Scale Invariant Feature Transform (SIFT) to obtain non-rigid moving human target features. Firstly, the contour appearance model of the moving human sequence is used to extract the contour feature sequence, which is preprocessed based on the contour appearance depth feature; Furthermore, the deformation degree of the contour is reconstructed and the calculation process of the number of shape bases was optimized, which is no longer simply defined as known. This method optimizes and solves the problem of missing data, improves the reliability of estimating the degree of contour deformation, and completes target reconstruction. The experimental results show that the threedimensional reconstruction algorithm can accurately reconstruct the changes in the movements of athletes' shots; The accuracy of 3D reconstruction can reach 95.98%; Moreover, PSNR, SSIM, and MSE indexes performed well with smaller fluctuation range, and the distribution of three-dimensional reconstructed scattering points is very close to the three-dimensional position distribution of real scattering points, and the three-dimensional reconstruction effect is good with strong reliability.

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Section: Reliability Estimation Of Non-rigid Body Deformation Degreementioning

confidence: 99%

Reconstruction of 3D Non-Rigid Moving Human Targets Based on Reliable Estimation of Contour Deformation Degree

Zhang,

Baza,

Alshahrani

2024

IEEE Access

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“…A good overview of different techniques can be found in [2]. The clusters of nodes identified to form islands should have minimal power imbalance [3][4], CI should cause a minimal change in the power flow pattern [5] [6], minimize dynamic stability problems [2], [7] - [14] and consider resynchronization requirements [15]. The conflicting requirements often require trade-offs [12].…”

Section: Introductionmentioning

confidence: 99%

Tree-Partitioning as an Emergency Measure to Contain Cascading Line Failures

Białek

Vahidinasab

2022

IEEE Trans. Power Syst.

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This paper proposes to replace controlled islanding, which is a defense mechanism against cascading failures, by tree partitioning whereby some of the tie-lines connecting the clusters are still connected in such a way that the cluster-level graph forms a tree. Tree-partitioning prevents line failures from spreading between clusters, similarly as for islanding, but keeps the clusters connected. That results in three main advantages. Power transfers between the clusters can still take place, helping to balance each cluster and limiting any necessary load shedding. Fewer lines are cut, which reduces the shock to the system. There is no need to resynchronize the clusters after the emergency. This paper offers a simple graph-theoretic justification for tree-partitioning, rather than one based on the spectral analysis of network Laplacian proposed in the literature. It also proposes a two-stage methodology, which utilizes spectral clustering, for splitting a network into tree-connected clusters. Test results performed on the 118 node IEEE test network have confirmed the usefulness of the methodology.

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“…This model greatly increases the accuracy compared to a standard DC PF, by minimally increasing the computation time. Another application for this approach is presented in [14], where a controlled islanding strategy for severe cascading events is developed using a mixed‐integer linear programming (MILP) model. A multi‐step corrective control method for nodal power injections, which can assist in mitigating the propagation of cascading failures, is presented in [15].…”

Section: Introductionmentioning

confidence: 99%

Multi‐zonal method for cascading failure analyses in large interconnected power systems

Stankovski

Gjorgiev

Sansavini

2022

IET Generation Trans & Dist

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Most cascading failure analysis methods successfully capture cascading developments within one control zone, or region comprised of multiple control zones, controlled by a single transmission system operator (TSO). They neglect, however, the operations of multi‐zonal systems. To bridge this gap, the authors introduce the multi‐zonal method for cascading failure analyses of large interconnected power systems. The method accounts for all control zones in a multi‐zonal system, assesses their power flows, re‐evaluates the system topology after disturbances and applies frequency balancing measures in each control zone independently, thus effectively simulating the actions of multiple TSOs. To demonstrate the capabilities of this method, a case study is investigated which compares the security benefits of the multi‐zonal (national) versus the single‐zone (regional) frequency balancing methods in a multi‐zonal system. The application to the IEEE 118‐bus test system shows that the regional approach increases the security of this system in small and medium cascades, whose expected demand not served is reduced by 28% and 26%, respectively, in comparison to the national approach. However, the expected load shedding for large‐scale cascading events in the regional approach is 42 times as large as in the national approach. This is mainly caused by overloads occurring in transmission lines adjacent to the cross‐zonal tie lines, which are 154% higher with the regional method compared to the national in large cascading events. The capability to identify congestions is presented by devising an upgrading strategy, which makes the regional frequency balancing approach viable from a security aspect.

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Intentional power system islanding under cascading outages using energy function method

Cited by 10 publications

References 33 publications

Reconstruction of 3D Non-Rigid Moving Human Targets Based on Reliable Estimation of Contour Deformation Degree

Reconstruction of 3D Non-Rigid Moving Human Targets Based on Reliable Estimation of Contour Deformation Degree

Tree-Partitioning as an Emergency Measure to Contain Cascading Line Failures

Multi‐zonal method for cascading failure analyses in large interconnected power systems

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