The maintenance plans in any PV plant is developed with the objective to preserve the efficiency of power plant components. Each of these methodologies has its own aspect, but mainly they focus on the characteristics of the PV plant components. The maintenance plan focuses on predictive maintenance where monitoring and inspection activities are performed to determine the best time to start the maintenance in order to minimise the efforts compared to corrective maintenance.
Preventive maintenance activity has a direct impact on the reliability of the equipment or components by improving their technical condition and prolonging their life. All maintenance procedures involve both costs and benefits.
Maintenance operations are profitable when the costs are lower than the potential cost of a failure, which these operations are trying to prevent. Most of the maintenance plans on short-and medium-term do not take into account the operating conditions in which the components operated throughout their runtime but rather are scheduled, based on the occurrence of defects and previous repairs.
The main purpose of the maintenance plan is to minimise production costs per unit of energy generated. In general, this is achieved by minimising operational and maintenance costs, improving PV module performance and efficiency. A study on “Key Technical Performance Indicators for Power Plants” proposes the following two indicators for determining the losses during maintenance of PV plant. Depending on these indicators, the maintenance policy can be scheduled in order to minimise production losses.
1. Preventive loss indicator (PLI)
PLI is the ratio between estimated energy loss caused by planned interruptions and the maximum energy that can be produced during the reported period (usually 1 year).
PLI = (Energy loss caused by the planned interruptions ÷ Maximum estimated energy that can be generated by PV plant per year ) X 100%
2. Corrective loss indicator (CLI)
CLI is the ratio between estimated energy loss caused by unplanned interruptions and the maximum energy that can be produced during the reported period.
CLI = (Energy loss caused by the unplanned interruptions ÷ Maximum estimated energy that can be generated by PV plant per year ) X 100%
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