Voltage stability assessment based on improved coupled single‐port method

Cui, Bai; Wang, Zhaoyu

doi:10.1049/iet-gtd.2016.2067

Cited by 30 publications

(25 citation statements)

References 36 publications

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“…The above‐mentioned issues are addressed in the modified coupled single port model in Reference. This work in Reference overcomes the shortcomings of overestimation or underestimation of voltage instability detection with the coupled single port method. The coupled single port methodology is accurate only if the loads are varying proportionally.…”

Section: Online Indices/methodologiesmentioning

confidence: 99%

Voltage instability detection using synchrophasor measurements: A review

Chappa¹,

Thakur

2020

Int Trans Electr Energ Syst

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Summary This article presents the concept of voltage instability and a critical review of the literature available for detecting voltage instability in the power system. Initially, the problem of voltage instability, the signification of P‐V, Q‐V curves, the effect of load models, on‐load tap changer (OLTC), and over‐excitation limits of generators on voltage instability are lucidly explained. A very brief description of conventional methodologies for voltage instability detection is also presented. This literature review mainly focuses on methodologies based on synchrophasor measurements including both local and global measurements. These methodologies' feasibility for real‐time application has been investigated. The indices that are compared for instability detection may serve as an introduction to measurement‐based voltage instability detection methodologies. The measurement‐based indices that are analyzed and compared are mainly based on the concept of Thevenin parameters estimation, generator equivalent models, nodal reactive power loss concept, and apparent power difference criteria. Thus, this paper attempted to compile all the work reported so far for voltage instability detection using synchrophasor measurements and for each methodology merits and demerits are lucidly discussed and are tabulated.

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Section: Online Indices/methodologiesmentioning

confidence: 99%

Voltage instability detection using synchrophasor measurements: A review

Chappa¹,

Thakur

2020

Int Trans Electr Energ Syst

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“…Hence, some researchers advocate the use of more elaborate models, which are based on so-called coupled single-port circuits. For example, the TE can be extended by a coupling term [31] or refined with sensitivity coefficients [32]. Finally, Ward equivalents can be used instead of TEs [33].…”

Section: Maximum Power Transfermentioning

confidence: 99%

A Generalized Index for Static Voltage Stability of Unbalanced Polyphase Power Systems Including Thévenin Equivalents and Polynomial Models

Kettner

Paolone

2019

IEEE Trans. Power Syst.

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This paper proposes a Voltage Stability Index (VSI) suitable for unbalanced polyphase power systems. To this end, the grid is represented by a polyphase multiport network model (i.e., compound hybrid parameters), and the aggregate behavior of the devices in each node by Thévenin Equivalents (TEs) and Polynomial Models (PMs), respectively. The proposed VSI is a generalization of the known L-index, which is achieved through the use of compound electrical parameters, and the incorporation of TEs and PMs into its formal definition. Notably, the proposed VSI can handle unbalanced polyphase power systems, explicitly accounts for voltage-dependent behavior (represented by PMs), and is computationally inexpensive. These features are valuable for the operation of both transmission and distribution systems. Specifically, the ability to handle the unbalanced polyphase case is of particular value for distribution systems. In this context, it is proven that the compound hybrid parameters required for the calculation of the VSI do exist under practical conditions (i.e., for lossy grids). The proposed VSI is validated against state-of-theart methods for voltage stability assessment using a benchmark system which is based on the IEEE 34-node feeder.Index Terms-hybrid parameters, multiport network model, polynomial model, polyphase power systems, Thévenin equivalent, unbalanced power systems, voltage stability index arXiv:1809.09922v3 [cs.SY]

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“…To examine the proximity to voltage instability, a variety of approaches were presented, such as singular value decomposition [13], continuation power flow [14,15], and Thevenin equivalent (TE) model [16][17][18][19][20][21][22][23][24]. Many of these studies have developed voltage stability indices, which aims to show how far the system is away from a possible instability event.…”

Section: Introductionmentioning

confidence: 99%

“…In [18], for example, a local voltage stability index using single-port TE model to estimate voltage stability margin was developed. To enhance the performance of single-port TE, several voltage stability indices based on coupled single-port TE were presented in [19][20][21][22][23][24], where the work [24] develops a L-index for system voltage stability analysis. The L-index is well suited for online applications.…”

Section: Introductionmentioning

confidence: 99%

GECM-Based Voltage Stability Assessment Using Wide-Area Synchrophasors

Liu

2017

Energies

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Abstract:Voltage instability is a crucial issue in the secure operation of power grids. Several methods for voltage stability assessment were presented. Some of them are highly computationally intensive, while others are reported not to work properly under all circumstances. This paper proposes a new methodology based on the generator equivalent circuit model (GECM) and the phasor measurement unit (PMU) technology for online voltage stability monitoring of a power grid. First, the proposed methodology utilizes synchronized phasor (synchrophasor) measurements to determine the impedance parameters of a transmission grid by means of the recursive least squares (RLS) algorithm. Furthermore, it incorporates the dynamic models of generators to handle the cases with generator reactive power limit violations. After that, an enhanced voltage stability index with GECMs incorporated is developed for reliable and accurate voltage stability assessment. The proposed methodology was first demonstrated on several standard IEEE power systems, and then applied to a practical power system, the Taiwan power (Taipower) system. The test results demonstrate the flexibility and effectiveness of the proposed methodology.

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Voltage stability assessment based on improved coupled single‐port method

Cited by 30 publications

References 36 publications

Voltage instability detection using synchrophasor measurements: A review

Voltage instability detection using synchrophasor measurements: A review

A Generalized Index for Static Voltage Stability of Unbalanced Polyphase Power Systems Including Thévenin Equivalents and Polynomial Models

GECM-Based Voltage Stability Assessment Using Wide-Area Synchrophasors

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