State of charge management in battery systems

摘要

The present invention is concerned with reduced calendar aging of a battery in a Battery Energy Storage System BESS for capacity firming or for load peak shaving. The invention takes advantage of the fact that load or production profiles for various applications may be known in advance, and may specifically be known to exhibit significantly varying characteristics, such as a day-night cycle or a working day vs. holiday distinction, with periods during which no or less battery intervention is required as compared to other periods. This is the case for instance with industrial load peaks exclusively occurring during working hours, and with energy production of solar power plants that follows a day-night cycle. Performance and battery aging in BESS operation are optimized by reducing a target average State of Charge of the battery during idle periods with less or no battery discharge.