Browsing by Author "Teh, Jiashen"

Now showing 1 - 7 of 7
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    Composite Reliability Impacts of Synchrophasor-Based DTR and SIPS Cyber–Physical Systems
    (IEEE Systems Journal, 2022) Jimada-Ojuolape, Bilkisu; Teh, Jiashen
    The integration of smart infrastructures that facilitate two-way communication via information and communi- cation technology (ICT) has enhanced the efficiency and sustain- ability of the power network. However, technologies, such as dy- namic thermal rating (DTR) systems and system integrity protec- tion schemes (SIPS), have disadvantages, including infrastructure failures, cyber–physical interdependencies, and cyber intrusions. These disadvantages contribute to the reduced reliability of the net- work. Comprehensive exploration of the reliability impacts of mul- tiple smart grid technologies on a single power network has not been conducted. A DTR and SIPS system integrating wide area monitor- ing functions using phasor measurement units (PMUs) is presented in this study, and the effect of ICT contingencies on network relia- bility is investigated. A Monte Carlo simulation approach and a sce- nario reduction technique are utilized in this article. This approach is evaluated on the IEEE-RTS to demonstrate the advantages of ICTs. The approach is suitable for different network topologies, in which the difference lies in the number of required PMUs. Results demonstrate that a reliable SIPS can minimize the aging process while slightly influencing load curtailment despite the increase in overall network aging due to DTR. PMU functional failures result in load loss due to loss of observability despite their high availability.
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    Impact of the Integration of Information and Communication Technology on Power System Reliability: A Review
    (IEEE Access, 2020) Jimada-Ojuolape, Bilkisu; Teh, Jiashen
    There has been a progressive development in the synthesis of Information and Communication Technologies (ICTs) in power networks recently. ICT systems have become a vital part of every aspect of our daily lives and its integration into the electric power system has become paramount. ICTs support efficient incorporation of activities of all stakeholders of the power system to certify a more cost-effective and sustainable power system. The power system will exhibit intelligent monitoring and control, bidirectional communication between stakeholders and power system elements, security and safety of supply and self-healing qualities. However, asides from the vast benefits ICTs, their implementation within the power network come with some drawbacks which include element failures, failures due to interdependencies as well as vulnerabilities to cyber-attacks. These drawbacks can impact the reliability of the power network negatively. The objective of this paper is to investigate the impact of ICTs integration on the reliability of power networks in terms of empirical validation of standard reliability indices. This study groups the findings into four perspectives, including the effects of cyber power interdependencies, ICT infrastructure failures, cyber-attacks and environmental conditions. As expected, results show that failures and maloperations in the ICT network have adverse effects on system reliability and careful considerations need to be made to dampen these shortcomings.
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    Impacts of Communication Network Availability on Synchrophasor-Based DTR and SIPS Reliability
    (IEEE Systems Journal, 2021) Jimada-Ojuolape, Bilkisu; Teh, Jiashen
    The modern electricity network has become smarter and more reliable because of the addition of information and com- munication technology. Dynamic thermal rating systems (DTR) allow existing transmission lines to be operated much closer to their limits. However, line outages after DTR implementation could threaten network security. Thus, system integrity protec- tion schemes (SIPS), which are designed to ensure security, are useful to forestall impending contingencies that could arise from DTR implementation. Furthermore, synchrophasors can improve wide-area monitoring and protection capabilities. However, the reliability of these technologies considering their communication network availability is yet to be studied in a unified framework. Therefore, a novel framework of synchrophasor-based DTR and SIPS is presented while examining eight DTR network topologies and two SIPS schemes simultaneously. A sequential Monte Carlo simulation-based technique is proposed to simulate the effect of the topologies on system-wide reliability. This method is tested on the IEEE-RTS. Results show an improvement of 93.27% between DTR communication Schemes 1 and 8 in load curtailment. More impor- tantly, the article reveals an improvement of 99.15% in the load curtailment value in scenarios where SIPS is deployed compared with the case where SIPS is not deployed, highlighting the benefits of DTR and SIPS hybrid implementation.
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    Securing the grid: A comprehensive analysis of cybersecurity challenges in PMU-based cyber-physical power networks
    (Electric Power Systems Research, 2024) Jimada-Ojuolape, Bilkisu; Teh, Jiashen; Lai, Ching-Ming
    The threat of cyber-attacks poses a considerable risk to Phasor Measurement Unit (PMU) applications within Cyber-Physical Power Networks (CPPNs), leaving them susceptible to malicious attacks such as false data in- jection, time synchronization manipulation, and DoS attacks. Existing studies in the area of cyber security in CPPNs primarily address broader network security issues, overlooking specific challenges in networks with features like PMU integration, highlighting the urgent need to explore vulnerabilities in PMU-based networks for comprehensive understanding. In this study, a thorough analysis is conducted, exploring various cyber-attacks targeting PMU-based CPPNs. These attacks are categorized into data integrity, communication network vul- nerabilities, device spoofing and tampering, and coordinated cyber-physical attacks and subsequently, discussed in detail, underscoring the pressing need for robust cybersecurity measures. The study not only provides valuable insights but also outlines future research directions, empowering power system researchers and operators to enhance the resilience of PMU-based CPPNs against evolving cyber threats. Like the need for more reliability studies that investigate impacts of cyber-attacks in PMU-based CPPNs. The findings offer a good foundation for devising effective planning and fortification strategies to navigate the challenges posed by emerging cyberse- curity threats.
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    Surveys on the reliability impacts of power system cyber–physical layers
    (Sustainable Cities and Society, 2020) Jimada-Ojuolape, Bilkisu; Teh, Jiashen
    Information and communication technology (ICT) is a vital addition to modern society living and is a crucial feature of the smart grid. It boosts the power system with the advantage of using intelligent infrastructure to aid monitoring, protection, bidirectional communication, supply safety, security and self-healing characteristics. ICT infrastructures are integrated into the power network by using technologies, such as active distribution net- works, smart cities and societies, dynamic line ratings, special protection schemes and demand-side management programmes. Deployment of these technologies has beneficial impacts on the reliability of power systems. However, these infrastructures are naturally prone to failures and cybersecurity issues because of Internet of things standards, which can further jeopardise system reliability. Various studies have examined the effect of these technologies on the reliability of power systems whilst ignoring that the associated ICTs could be un- available. Thus, this work comprehensively reviews studies that go beyond component-based reliability as- sessment and accounts for the impact of ICT integrations on system-wide reliability whilst explicitly considering the effects of malfunctions of the cyber system. Moreover, the paper presents quantitative and qualitative in- formation about the impact of ICT deployed with various smart grid technologies and applications on the re- liability of modern power systems.
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    Synchrophasor-Based DTR and SIPS Cyber-Physical Network Reliability Effects Considering Communication Network Topology and Total Network Ageing
    (IEEE Access, 2023) Jimada-Ojuolape, Bilkisu; Teh, Jiashen; Alharbi, Bader
    The lifespan of overhead transmission conductors is influenced by various factors, including design, maintenance, and operating conditions. Prolonged exposure to high temperatures, particularly near maximum design values, can significantly age transmission lines (TLs). The dynamic thermal rating (DTR) system, an advanced technology that increases TL capacities, can contribute to these stringent conditions. DTR overlays a cyber layer with communication and control systems onto the physical network, transforming it into a cyber-physical network. Currently, the increased risk of TL ageing associated with DTR, and the cyber layer’s functionality lack a unified framework for quantification. This study introduces a novel framework that considers the cyber layer’s network topology and its impact on TL ageing due to DTR implementation. It also proposes the implementation of system integrity protection schemes (SIPS) within the framework. SIPS detects abnormal conditions from DTR deployment, like excessive line loading, and takes corrective actions to optimize DTR system’s performance. The study employs a Sequential Monte Carlo Simulation (SMCS) technique on a modified cyber-physical IEEE RTS-79. The study reveals that topologies like double ring and mesh, cause higher line ageing indices compared to line and star topologies. ETNA values remain relatively stable across the network topologies within a year, suggesting minimal short-term impact on transmission line ageing. However, cumulative effects over several years can potentially reduce lifespan. SIPS can slow network ageing by up to 5hr/yr, but their contingencies can cause the opposite effect. Nonetheless, a reliable SIPS can maintain an ETNA value of 101hr/yr without increasing load curtailment.
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    Synchrophasor-Based Dynamic Thermal Rating System for Sustainable Cyber- Physical Power Systems
    (CRC press, Tailor and Francis group, 2023) Jimada-Ojuolape, Bilkisu; Teh, Jiashen; Arowolo, Olaolu Micheal