Modelling of corrective actions in power system reliability analysis

Consequence analysis, including the modelling of corrective actions, is an important component when performing power system reliability analyses. Using an integrated methodology for power system reliability analysis, we investigate the impact of different modelling choices for the consequence analysis on estimates for the energy not supplied. These investigations corroborate the large impact modelling assumptions for corrective actions have on the resulting reliability indices. We have also identified other features of the consequence analysis, such as islanding and distributed slack, that can be important to take into account. The findings and the underlying structured approach contribute to improving the accuracy of power system reliability analyses.Modelling of corrective actions in power system reliability analysisacceptedVersio

The OPAL methodology for reliability analysis of power systems

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The impact of protection systems on power system reliability

This report is a collection of memos written to describe the methodology for quantifying the impact of protection systems on power system reliability. Including the effect of protection system response scenarios on a transmission system is vital for a realistic appraisal of the reliability attributes of electricity supply. This is usually accomplished by resorting to Markov models. As a viable alternative, a new procedure based on approximate methods of system reliability evaluation is proposed in this work. This is used in conjunction with the OPAL methodology for reliability analysis of power systems. The overall reliability model is thus based on minimal cutsets for each delivery point, which are obtained from an analytical contingency enumeration approach. The results are first demonstrated on the four bus OPAL test network. Additional dependent failure considerations in the modeling are then illustrated on a Modified OPAL (MOPAL) test network. Further, the impact of substation configuration arrangement (breaker-and-a-half scheme) has been investigated, on the transmission protection system failure dependency propagation and the consequent effect on reliability of supply. The results are presented for the MOPAL test network.publishedVersio

Risk Based Decision for Reinvestments in Distribution Systems

This paper illustrates the challenges associated with risk assessment for reinvestments decisions. A holistic framework for risk assessment in electricity distribution systems will be described first and then used to structure the analysis and decision making in a case study concerning cable reinvestment. These decisions are generally multi criteria decisions, including risks related to e.g.; economy, environment, reputation, safety and quality of supply. The paper describes the use of different types of decision support tools used to aid reinvestment decision making in electricity distribution systems, with emphasis on multi criteria decision analysis (MCDA).acceptedVersio