Voltage stability assessment and identification of important nodes in power transmission network through network response structural characteristics

Adebayo, Isaiah G.; Jimoh, A.A.; Yusuff, Adedayo A.

doi:10.1049/iet-gtd.2016.0745

Cited by 28 publications

(9 citation statements)

References 28 publications

(52 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…23,24 In AVSR, a two-dimensional plane geometrical concept is used to represent the voltage stability index considering both axes as the active and reactive loading, respectively. In the literature, [25][26][27][28] the network response structural characteristics of complex systems are adopted to derive tools for power system node and branch severity ranking. L-Index, P-index, V/V0 index, and modal analysis were extensively discussed and applied for voltage stability assessment in other works.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of a new VSC‐optimal power flow formulation for power system security planning

Adewuyi

Howlader

Olaniyi

et al. 2020

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

Summary The performance of a new approach for multiobjective voltage stability constrained‐optimal power flow (VSC‐OPF) formulation is compared with a conventional VSC‐OPF approach for improving the steady‐state power systems security in this paper. The compared OPF problems involve the minimization of the fuel cost and minimization of novel line stability index (NLSI) for case 1 and minimization of fuel cost and maximization of line static stability margin (CBI) for the proposed case 2. Clerc's constricted PSO algorithm modified with the nondominated sorting algorithm is used for obtaining the best solution point for each of the decision variables. Network security constraints and bus voltage limits are considered along with the constraint on permissible line stability margin limit adopting the quadratic penalty model for constraints violations. The approach is tested on a load‐modified IEEE 30‐bus and actual Nigerian 28‐bus systems. From the results obtained, the proposed OPF formulation performed better for simultaneous consideration of voltage stability improvement and line loss reduction.

show abstract

Section: Introductionmentioning

confidence: 99%

Comparative analysis of a new VSC‐optimal power flow formulation for power system security planning

Adewuyi

Howlader

Olaniyi

et al. 2020

Int Trans Electr Energ Syst

View full text Add to dashboard Cite

show abstract

“…Te optimization results for a single fault are difcult to achieve for all faults, and even the postfault response is degraded in some scenarios. To improve the applicability, the weighting value of the optimization results a' is derived as follows: By introducing the index of the importance degree of the node φ IDN [38], the severity index of the nth scenario φ SEV (n) is calculated in the following equation:…”

Section: Parameter Optimization Under Scenarios With Diferentmentioning

confidence: 99%

Suppression to Angular Oscillation among Synchronous Generators by Optimizing Parameters and Set-Points of Synchronous Condenser and High-Voltage DC

Tao

et al. 2022

International Transactions on Electrical Energy Systems

View full text Add to dashboard Cite

After losing one or two poles of the high-voltage DC (HVDC) line, power systems may experience angular oscillations among the synchronous generators (SGs), possibly followed by tripping of the SGs and blackouts of the loads. To suppress the oscillations, the difficulty lies in the optimization methods and the countermeasures. For the former, parameter optimization based on the eigen-analysis for a given scenario is not suitable for angular oscillation after a large disturbance lasting for several seconds or longer. For the latter, adjusting the active power of the SGs is effective but responds slowly. Adjusting the excitation system of the synchronous condensers (SCs) is seldom studied since the relation of the power angle with the reactive power is not clearly described. Adjusting the control parameters of the remaining HVDC has limited effect and is not enough. The set-points for the controller of the HVDC are adjusted to suppress the oscillation but are to be restored after the oscillation, which is different from optimization of the control parameters. In this paper, coordinated optimization of the control parameters and the set-points of the SC and the HVDC is proposed to suppress the angular oscillations among the SGs. At first, the relation of the reactive power of the SC with the power angles is validated to provide the basis for optimizing the control parameters and the set-points of the SC. Since the analytical expression between the power angle and the control parameters or the set-points related to the reactive power is not explicit and the optimization periods of different parameters are different, an improved analytical model of the trajectory sensitivity (TS) is proposed. Based on the indication indices, the control parameters and the set-points of the constant current controller and the excitation system to be optimized are decided. The gradients of the objective function are extended to derive a coordinated multiparameter optimization model to suppress the angular oscillation among the SGs. The numerical results validate the accuracy of the improved TS by comparing it with the perturbation method. The time-domain analysis in different scenarios shows that the angular oscillations in the AC/HVDC system are effectively suppressed with the proposed optimization model.

show abstract

“…In this method, electrical distance, power transfer distribution, and line flow limits are also required to create the pure topological metrics. Structural characteristics of the network were used to compute important nodes for analysing susceptibility to voltage instability in [18]. Concept of hybrid flow betweenness was developed in [19] instead of assuming the shortest path power flow for computing topology betweenness.…”

Section: Introductionmentioning

confidence: 99%

Graph-theoretic algorithms for cyber-physical vulnerability analysis of power grid with incomplete information

Srivastava

Ernster

Liu

et al. 2018

J. Mod. Power Syst. Clean Energy

View full text Add to dashboard Cite

A key focus recently has been in assessing the risk of a coordinated cyber-physical attack and minimizing the impact of a successful attack. Most of the cyberattackers will have limited system information and conventional power grid N-1 security analysis cannot be extended to assess the risk. Centrality measures are widely used in the network science and an attacker with incomplete information can use it to identify power system vulnerabilities by defining the system as a complex network but without real-time system measurements. This paper presents a graph theory based centrality indices for vulnerability assessment of the power system due to various bus and branch contingencies using limited system information and provides a preliminary defense mechanism to prevent such an attack. Proposed work answers the fundamental question of possible attack scenarios by balancing risk (limited information with low risk to get caught or high risk attack to access more system information) and impact (identifying contingencies with maximal impact on system operation). Statistical comparisons are made between the graph theory measures compared to the corresponding DC power flow based N-X linear sensitivity measures. A unified N-X centrality based performance index is proposed and validated against the AC power flow based performance index by doing the real-time simulations of an N-3 attack scenario. Defensive mechanisms using topology-based performance indices are also presented.

show abstract

Voltage stability assessment and identification of important nodes in power transmission network through network response structural characteristics

Cited by 28 publications

References 28 publications

Comparative analysis of a new VSC‐optimal power flow formulation for power system security planning

Comparative analysis of a new VSC‐optimal power flow formulation for power system security planning

Suppression to Angular Oscillation among Synchronous Generators by Optimizing Parameters and Set-Points of Synchronous Condenser and High-Voltage DC

Graph-theoretic algorithms for cyber-physical vulnerability analysis of power grid with incomplete information

Contact Info

Product

Resources

About