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Recently, availability decrease due to increase of midnight electric power demand has risen necessities to improve economic efficiency of the pumped-storage power plants in South Korea. The necessities cause to extend a preventative maintenance cycle, especially an overhaul cycle. But, unconditional extension cannot be implemented because it may generate unanticipated failures due to insufficient maintenance. So, first, in this study, possibility of extension of the preventative maintenance cycle is identified via investigation on preventative maintenance situation of overseas and domestic hydropower plants. Second, a methodology to optimize the preventative maintenance cycle considering both reliability and economic efficiency is presented via review of the previous reliability studies and considering characteristics of the pumped-storage power plant. The methodology consists of the eight parts including selection of principal components and subcomponents, identification of damage mechanisms in the principal components/subcomponents, FMEA(failure mode effect analysis), derivation of replacement and repair time of the principal components/subcomponents, design of preventative maintenance cycle plan, reliability analysis, economic assessment, and derivation of the optimized preventative maintenance cycle. Also, as a result of application of the methodology to an aged pumped-storage power plant in South Korea, the overhaul cycle has been extended from 4 years to 7.5years. Last, effect of replacement of some aged principal subcomponents such as rotor runner and generator stator on economic profits is investigated via application of the methodology to the aged pumped-storage power plant.

Investigation on Effect of Aged Pumped-Storaged Component Replacement on Economic Profits Considering Reliability and Economic Efficiency