A Robust Communication-Based Special Protection System

Class, Luis A Oquendo; Hopkinson, Kenneth M.; Wang, Xiaoru; Andel, Todd R.; Thomas, Ryan W.

doi:10.1109/tpwrd.2010.2042973

Cited by 12 publications

(1 citation statement)

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“…When this occurs, other generating units can trip, resulting in cascading events leading to system blackouts unless SPS actions are taken [24]. The frequency of 58.8 Hz is chosen as the frequency threshold for SPS success based on previous research [6], [19], [25]. Operating too far below this threshold can cause an increase in generator turbine vibrations, ultimately damaging the generator causing it to fail [8].…”

Section: B Simulation Scenariomentioning

confidence: 99%

Con-Resistant Trust for Improved Reliability in a Smart-Grid Special Protection System

Shipman

Hopkinson

López

2015

IEEE Trans. Power Delivery

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This paper applies a con-resistant trust mechanism to improve the performance of a communications-based special protection system to enhance its effectiveness and resiliency. Smart grids incorporate modern information technologies to increase reliability and efficiency through better situational awareness. However, with the benefits of this new technology come the added risks associated with threats and vulnerabilities to the technology and to the critical infrastructure it supports. The research in this paper uses con-resistant trust to quickly identify malicious or malfunctioning (untrustworthy) protection system nodes to mitigate instabilities. The con-resistant trust mechanism allows protection system nodes to make trust assessments based on the node's cooperative and defective behaviors. These behaviors are observed via frequency readings which are prediodically reported. The trust architecture is tested in experiments by comparing a simulated special protection system with a con-resistant trust mechanism to one without the mechanism via an analysis of the variance statistical model. Simulation results show promise for the proposed con-resistant trust mechanism.

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Section: B Simulation Scenariomentioning

confidence: 99%

Con-Resistant Trust for Improved Reliability in a Smart-Grid Special Protection System

Shipman

Hopkinson

López

2015

IEEE Trans. Power Delivery

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Optimal time‐current graded coordination of multistage inverse‐time overcurrent relays in distribution networks

Hamidi

Ahmadian

Patil

et al. 2019

Int Trans Electr Energ Syst

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Summary This paper proposes a method for optimal coordination of multistage overcurrent relays (OCRs) in radial distribution networks, including industrial, rural, and urban grids. The proposed method optimally coordinates multistage time‐current curves (TCCs) using the genetic algorithm (GA). The proposed method is able to determine the proper TCC type (eg, moderately inverse, very inverse, and extremely inverse), pickup current, and time‐setting multiplier (TSM) for each stage of TCCs. The proposed method utilizes the dynamic models of OCRs and fuses. This safeguards the relays against the maloperations resulting from the DC decaying part of fault currents and transient overcurrents caused by transformer energization or motor starting. The proposed method is evaluated using DIgSILENT Power Factory for power system analysis and Matlab for implementation of the proposed method. According to the simulation outcomes, the advantages and disadvantages of the proposed method are discussed and compared with the existing methods.

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