A reliability-centred asset maintenance method for assessing the impact of maintenance in power distribution systems

Allan, R.N.

doi:10.1109/pes.2005.1489068

Cited by 24 publications

(25 citation statements)

References 11 publications

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“…RADPOW was developed by the Centre of Excellence in Electrical Engineering at KTH [5], [6]. The tool includes an analytical approach to the reliability predictions.…”

Section: B Analytical Tool For Reliability Assessment Radpowmentioning

confidence: 99%

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Evaluation of the customer value of component redundancy in electrical distribution systems

Bertling¹,

Larsson²,

Wallnerström

2005

2005 IEEE Russia Power Tech

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Abstract-A new regulatory model for the Swedish electrical distribution system operators has been proposed, and is now being implemented. The model is referred to as the Network Performance Assessment Model (NPAM). The NPAM is based on fictive reference networks. These emanate from a radial network that is reinforced with redundant components if it increases the customer value more than required investment cost for higher system reliability. The NPAM involves a paradigm shift for the Swedish DSO from a system based on compensation for costs to one based on performance. Evidently, it is of great importance to both the regulator and the different DSOs to evaluate how well the NPAM calculates the performance i.e. the customer values. The aim for this paper is to take a first step in this process; by putting light on how these redundant reference networks are created and used for the NPAM. In order to do this a comparative study has been made for a small test system where two different approaches are used for identifying the resulting redundant reference network for a system. The NPAM approach uses a Monte Carlo simulation technique, and the comparative approach uses an analytical based reliability assessment tool RADPOW, developed at KTH.Index Terms-Customer value, Electrical distribution systems, Network Performance Assessment Model, Outage cost, Power systems, Probability, Performance based regulation, Redundancy, Reference networks and Reliability. I. INTRODUCTIONlectrical energy customers generally require high availability in the power supply. However, if, as for other goods, the customer were to pay a price for electricity corresponding to the customer value, different customers, such as industrial or household, would have different values for energy not supplied Consequently, there would be different set of prices for power supply from a customer point of view. From the perspective of the electrical distribution system operator (DSO), there is a cost for operation and maintenance of the electrical distribution system, to balance against the requirements for system reliability and the profit for the stakeholders. In a perfect market environment, a balance would be reached where customers select the DSO with the best price for the required customer value. However, the infrastructure for the electrical distribution system is in most cases still under a monopoly. To manage this situation the authorities apply different regulatory tools. In Sweden, a The NPAM aims to regulate the network tariffs, i.e. the price that the DSO charges the power supply customers, based on the customer value. An increase in network tariffs should then only be valid if it creates higher customer value, e.g. by increased system reliability. It is important to realize, however, that an increase in system reliability does not necessarily lead to a corresponding increase in customer value. The increase in customer value might be lower than the cost of increasing the reliability and the DSO will not be completely compensated by the network ...

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“…RADPOW was developed by the Centre of Excellence in Electrical Engineering at KTH [5], [6]. The tool includes an analytical approach to the reliability predictions.…”

Section: B Analytical Tool For Reliability Assessment Radpowmentioning

confidence: 99%

“…More specifically, the paper addresses the question of how system redundancy is created for the reference networks and compares it with a general reliability model for electrical distribution systems, using the reliability assessment tool RADPOW, developed at KTH [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the customer value of component redundancy in electrical distribution systems

Bertling¹,

Larsson²,

Wallnerström

2005

2005 IEEE Russia Power Tech

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“…The RCM concept has been described in many studies [4][5][6][7][8]. The most of research focuses on the relationship between the reliability and cost on RCM models [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

“…The most of research focuses on the relationship between the reliability and cost on RCM models [4][5][6]. The model described in [4] determines a maintenance interval very similar to another maintenance method called TBM. The model described in [5] determines the inspection interval.…”

Section: Introductionmentioning

confidence: 99%

Application of Particle Swarm Optimization to the Reliability Centered Maintenance Method for Transmission Systems

Heo¹,

Lyu²,

Kim³

et al. 2012

Journal of Electrical Engineering and Technology

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-Electric power transmission utilities make an effort to maximize profit by reducing their electricity supply and operation costs while maintaining their reliability. The development of maintenance strategies for aged components is one of the more effective ways to achieve this goal. The reliability centered approach is a key method in providing optimal maintenance strategies. It considers the tradeoffs between the upfront maintenance costs and the potential costs incurred by reliability losses. This paper discusses the application of the Particle Swarm Optimization (PSO) technique used to find the optimal maintenance strategy for a transmission component in order to achieve the minimum total expected cost composed of Generation Cost (GC), Maintenance Cost (MC), Repair Cost (RC) and Outage Cost (OC). Three components of a transmission system are considered: overhead lines, underground cables and insulators are considered. In regards to aged and aging component, a component state model that uses a modified Markov chain is proposed. A simulation has been performed on an IEEE 9-bus system. The results from this simulation are quite encouraging, and then the proposed approach will be useful in practical maintenance scheduling.

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“…Two programs have been developed; RADPOW and RACalc. RADPOW was first introduced in 2003 [4] and has constantly been improved with the latest methods developed within the RCAM group since then [5]. One example is the component importance indices, which is one of the major research topic within the group [6] [7].…”

Section: Introductionmentioning

confidence: 99%

RACalc - A power distribution reliability tool

Setréus

Wallnerström

Hilber

et al. 2010

2010 IEEE 11th International Conference on Probabilistic Methods Applied to Power Systems

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Abstract-One major objective of maintenance management activities in electrical distribution systems is to find the right level of investments. Within an MSc thesis project at KTH, the probabilistic reliability software RACalc has been developed to support the decision making in the distribution system maintenance planning and risk analysis. This paper describes the algorithms in RACalc and shows on present status on RADPOW, an additional reliability tool developed within the research group.Calculations with RACalc is in this paper exemplified with a case study on an existing Swedish distribution system, were the program is used to determine the components' importance to the system reliability indices. The result show that if the failure rate can be decreased by 10% on the 21% most important components, the overall system reliability improvement is more than 7%.

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A reliability-centred asset maintenance method for assessing the impact of maintenance in power distribution systems

Cited by 24 publications

References 11 publications

Evaluation of the customer value of component redundancy in electrical distribution systems

Evaluation of the customer value of component redundancy in electrical distribution systems

Application of Particle Swarm Optimization to the Reliability Centered Maintenance Method for Transmission Systems

RACalc - A power distribution reliability tool

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