FOR is defined as the number of hours the power station unit is on forced outage over the total number of hours in a year. So to calculate FOR of a renewable energy plant such as a wind power plant, we must have the data about the number of hours when the wind speed is below the minimum threshold required for power generation and the total number of hours for which it is operational. Another example is that of the solar thermal power plant. In such a plant, the number of hours in the night are the hours of forced outage. So FOR varies with different types of plants that we consider and cannot be calculated either statistically or through simulation without raw data.
The FOR are usually estimated based on the registered maintenance and repair records of power plants. We are working on a detailed project for estimating the reliability, availability l, and maintainability of wind, and solar-PV energy systems.
You may read the following articles
https://www.researchgate.net/publication/307585524_Wind_Energy_Conversion_Systems_Reliability_Prospective?_iepl%5BviewId%5D=OPLCL9kESzvOSIOCMt6690Wm&_iepl%5BprofilePublicationItemVariant%5D=default&_iepl%5Bcontexts%5D%5B0%5D=prfpi&_iepl%5BtargetEntityId%5D=PB%3A307585524&_iepl%5BinteractionType%5D=publicationTitle
https://www.researchgate.net/publication/321870624_Reliability_Assessment_of_Wind_Turbine_Operating_Concepts_using_Reliability_Block_Diagrams_RBDs?_iepl%5BviewId%5D=DCkbYJuKqc38b0JpB0ae1lwD&_iepl%5BprofilePublicationItemVariant%5D=default&_iepl%5Bcontexts%5D%5B0%5D=prfpi&_iepl%5BtargetEntityId%5D=PB%3A321870624&_iepl%5BinteractionType%5D=publicationTitle
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