Abstract
In order to meet the design and operation requirements of uncertain renewable energy accommodation in power grid, this paper establishes the energy model of pumped hydro storage station, including energy water head, energy storage and the relationship of conversion between power and energy. The energy water head which directly describes the potential energy of water storage of upper reservoir is different from the conventional water head; the change of supply water storage has obvious influence on the energy water head, and the conservation of the energy water head increment describes the influence of the change of supply water storage on energy water head; energy storage is determined by the water storage of upper reservoir and the energy water head; energy storage capacity is determined by the power generation storage capacity and the rated energy water head; the sensitivity analysis shows that the change of the water storage of upper reservoir is the main cause of the energy storage change. The concept and construction method of the storage function are put forward to calculate the energy storage situation quickly.
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