Operation related maintenance and reinvestment costs for hydropower scheduling

Abstract This paper addresses the questions: How to calculate cost of a start/stop cycle? running one hour outside normal operating range, e.g., on part load? The presents model for calculation individual hydropower units comprising both direct costs incurring at each cycle, and indirect because reduced rehabilitation intervals main components. fundamental assumption is that frequent start-ups lead increased stress, degradation wear reducing residual service life equivalent certain number hours, thus accelerating need rehabilitation. proposed used average marginal cycle. When calculating cost, technical condition turbine generator as well length stand-still period can be considered. Applying similar approach, extended ramping, load overload operation, i.e., when using unit range. extension operation related important include deciding scheduling in systems with large shares variable generation from wind solar. Such are very consider optimal strategy power where delivers flexibility terms following different types reserves.