RELIABILITY-ANALYSIS FOR HYDROTHERMAL GENERATING SYSTEMS INCLUDING THE EFFECT OF MAINTENANCE SCHEDULING

Usually, reliability indicators are obtained for one year periods, and must take into account maintenance requirements for thermal, units. T his paper describes an efficient method for the calculation of the two most common reliability indicators: LOLE (Loss Of Load Expectation) a nd EENS (Expected Value of Energy Not Served), in the case of electric systems including generation units with limits on energy generation ( hydro plants with a variable amount of available water). The method is based on transforming the initial load curve into a thermal load curv e, which enables one to separate completely the hydrothermal system an d the thermal system, thereby facilitating both the reliability evalua tions and the maintenace scheduling.