Impact of Imperfect Repairs and Diagnostic Coverage on the Reliability of Multi-Channel IEC-61850 Substation Communication Network

Mathebula, Vonani Clive; Saha, Akshay Kumar

doi:10.1109/access.2020.3047781

Cited by 7 publications

(8 citation statements)

References 40 publications

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“…In [23], the authors integrated the quality of repairs in a 'one-out-of-two' reliability model using the Markov process. The impact of the quality of repairs on the reliability performance of SCN architecture based on IEC 61850 is discussed in [37], [38]. Other studies are presented in [39], [40] focusing on the SCN architecture's responsiveness to incremental changes in the quality of repairs.…”

Section: A Critical Review Of Iec 61850 Scn Architecture Reliability Studiesmentioning

confidence: 99%

“…This section presents the main concepts used in this paper to study the system's dynamics, considering the state transition movements as a series of finite symbols. At the highest level of system abstraction, it is considered that the next system's state is only dependent on the current state based on some rule, such that the next system state is given by (22), assuming that is a vector in , where represents the dimension of the system if a linear map exists such that : → [38], [49]- [51].…”

Section: Linear Dynamical Systemsmentioning

confidence: 99%

“…Markov processes can be viewed as linear dynamical systems, where the row of the transition probability matrix represents the system's state at time [37], [38]. The impact of CCFs on the systems' dynamical behaviour and performance is analysed by prudently examining the behavioural dynamics of the system's transitions' probabilities.…”

Section: System Dynamics and Convergence Of Markov Processesmentioning

confidence: 99%

“…The impact of CCFs on the systems' dynamical behaviour and performance is analysed by prudently examining the behavioural dynamics of the system's transitions' probabilities. In considering (31), the transition probability matrix can be written in the form of (32) [37], [38].…”

Section: System Dynamics and Convergence Of Markov Processesmentioning

confidence: 99%

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Impact of Quality of Repairs and Common Cause Failures on the Reliability Performance of Intra-Bay IEC 61850 Substation Communication Network Architecture Based on Markov and Linear Dynamical Systems

Mathebula

Saha

2021

IEEE Access

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Modernisation of substations using digital-based Substation Communication Networks (SCN) enables the automation of substations, allowing effective and efficient monitoring of substation equipment and implementing complex control and protection schemes. The IEC 61850 standard for SCN's objective is to integrate substation devices from different vendors, enabling peer-to-peer communication between the devices. The reliability investigation of the IEC 61850 based SCN architecture continues since it is left to the system designer to determine based on the network's applications and functions. In all endeavours to designing highly available SCN architectures, redundant systems are employed in mission-critical applications. In this paper, the impact of Common Cause Failures (CCF) and the quality of repairs on the reliability performance of IEC 61850 based architecture are investigated using the Markov process and Linear Dynamical Systems, where the diagnostic coverage level of the system is based on the ISO 13849-1. The results of the case studies indicate that common engineering design and coupling factors have a negative impact on the system reliability performance, notably for systems with high diagnostic coverage. The results also indicate that the factors have less impact when the system diagnostic coverage is low, specifically at low repair efficiency levels. However, the impact becomes more pronounced as the repair efficiency increases, as observed from the responses of the transition probability matrix's eigenvalue magnitudes. Thus, it is critical to ensure the minimum impact of common engineering design and coupling factors by diversifying the system's subsystems to ensure a high independence level.

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Section: A Critical Review Of Iec 61850 Scn Architecture Reliability Studiesmentioning

confidence: 99%

Section: Linear Dynamical Systemsmentioning

confidence: 99%

Section: System Dynamics and Convergence Of Markov Processesmentioning

confidence: 99%

Section: System Dynamics and Convergence Of Markov Processesmentioning

confidence: 99%

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Impact of Quality of Repairs and Common Cause Failures on the Reliability Performance of Intra-Bay IEC 61850 Substation Communication Network Architecture Based on Markov and Linear Dynamical Systems

Mathebula

Saha

2021

IEEE Access

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“…Moreover, operational challenges such as a greater percentage of power network equipment damage and customer service disruptions caused by breakdowns and faults in the distribution feeders as overhead power systems are subjected to either partial or permanent faults [6]. Although systems are designed to be as fault-free as possible, it is impractical to eliminate the fault occurrence completely [7]. However, system abnormalities must be catered to during the engineering design stage, commissioning, and maintenance to circumvent enormous damage and guarantee the protection of expensive equipment [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Effects of Particle Swarm Optimization and Genetic Algorithm Control Parameters on Overcurrent Relay Selectivity and Speed

Langazane

Saha

2022

IEEE Access

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Distribution systems continue to grow and becoming more complex with increasing operational challenges such as protection miscoordination. Initially, conventional methods were favoured to solve overcurrent relay coordination problems; however, the implementation of these methods is time-consuming. Therefore, recent studies have adopted the utilisation of particle swarm optimization and genetic algorithms to solve overcurrent relay coordination problems and maximise system selectivity and operational speed. Particle swarm optimization and genetic algorithms are evolutionary algorithms that at times suffer from premature convergence due to poor selection of control parameters. Consequently, this paper presents a comprehensive sensitivity analysis to evaluate the effect of the discrete control parameters on particle swarm optimizer and genetic algorithms performance, alternatively on the behaviour of overcurrent relays. Optimization algorithms aim to minimise overcurrent relay time multiplier settings and accomplish optimal protection coordination. The findings indicate that particle swarm optimization is more sensitive to inertia weight and swarm size while the number of iterations has minimal effect. The results also depict that 30% crossover, 2% mutation, and smaller population size yield faster convergence rate and optimise fitness function, which improves genetic algorithms performance. Sensitivity analysis results are verified by comparing the performance of particle swarm optimization with the genetic algorithms which show the former parameter setting outperforms the latter. The relay operational speed is reduced by 15% for particle swarm optimization and system selectivity is maximised. The optimal protection coordination achieved using particle swarm optimization showed superiority of the algorithm, its ability to circumvent premature convergence, consistency, and efficiency.

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Sensitivity and elasticity of multi-channel IEC-61850 Substation Communication Networks to imperfect repairs

Mathebula

Saha

2021

Sustainable Energy, Grids and Networks

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Impact of Imperfect Repairs and Diagnostic Coverage on the Reliability of Multi-Channel IEC-61850 Substation Communication Network

Cited by 7 publications

References 40 publications

Impact of Quality of Repairs and Common Cause Failures on the Reliability Performance of Intra-Bay IEC 61850 Substation Communication Network Architecture Based on Markov and Linear Dynamical Systems

Impact of Quality of Repairs and Common Cause Failures on the Reliability Performance of Intra-Bay IEC 61850 Substation Communication Network Architecture Based on Markov and Linear Dynamical Systems

Effects of Particle Swarm Optimization and Genetic Algorithm Control Parameters on Overcurrent Relay Selectivity and Speed

Sensitivity and elasticity of multi-channel IEC-61850 Substation Communication Networks to imperfect repairs

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