Modelling generator maintenance scheduling costs in deregulated power markets

Abstract

Generating companies use the maintenance cost function as the sole or main objective for creating the maintenance schedule of power generators. Usually only maintenance activities related costs are considered to derive the cost function. However, in deregulated markets, maintenance related costs alone do not represent the full costs of generators. This paper models various cost components that affect the maintenance activities in deregulated power markets. The costs that we model include direct and indirect maintenance, failures, interruptions, contractual compensation, rescheduling, and market opportunity. The loss of firm's reputation and selection of loyalty model are also considered using the Analytic Hierarchy Process (AHP) within an opportunity cost model. A case study is used to illustrate the modelling activities. The enhanced model is utilised in generator maintenance scheduling cases. The experimental results demonstrate the importance and impact of market related costs in maintenance schedules.

Multi-criteria decision analysis for supporting the selection of medical devices under uncertainty

“…An assessment of the consistency ratio ( ) and consistency index ( ) were defined, as was recommended (Dahal, Al-Arfaj, & Paudyal, 2015;Saaty, 1980). The random consistency index ( ) was selected based on the data (Forman, 1990).…”

Constrained non-linear multi-objective optimisation of preventive maintenance scheduling for offshore wind farms

“…Specifically, the power production and maintenance costs are the two fundamental costs mostly taken into account when building a cost minimisation objective, and the remaining types of costs are used in different degrees. According to Dahal et al [9], Ding and Tian [14] and Zhang et al [52], the market related maintenance costs 3 and the accompanying compensation cost 4 can usually be found in both the preventive and corrective maintenance, while the failure cost (i.e., cost of repair or replacement because of failures) arises only after the breakdown has happened in the mechanical system.…”

“…In order to cater to the PM without a power shortage or system failure in this paper, we refer to the definitions of the no-failure maintenance cost presented by Dahal et al [9] and Dalgic et al [12] to some degree, including the classical maintenance cost (direct and indirect costs), the start-up cost, the fixed cost, the variable cost and the opportunity cost, owing to opportunity foregone as the economic criterion of our PM scheduling problem of offshore wind farms. Although the power production cost is used in most of the literature, it is not imported in our model because we attribute it to its weak relationship with maintenance works.…”

“…Although the power production cost is used in most of the literature, it is not imported in our model because we attribute it to its weak relationship with maintenance works. In Fattahi et al [19] Mollahassani-pour et al [37] Dahal et al [9] Dalgic et al [12] Gundegjerde et al [23] Lagaros et al [28] Lv et al [34] addition, some other cost factors particularly for wind farms are also involved in our definition as indicated by Ding and Tian [14] and Gundegjerde et al [23], e.g., the fixed cost of sending vessels to wind farms for maintenance, the variable access cost to wind turbines, etc. Thus, a new rational and offshore wind farm-oriented maintenance related cost criterion is well built to conduct an overall weighting.…”

“…in which the manpower cost C M i,t and the transportation cost C T i,t are detailed by their definitions, respectively, see Eqs. (8) and (9).…”