Abstract
Combining intermittent renewable energy with large-scale energy storage technology is considered an essential technological approach for the broader application of wind power and solar energy. Pumped hydro combined with compressed air energy storage system (PHCA) is a novel energy storage system that could help solve energy storage difficult in China's arid regions. This combination integrates the advantages and overcomes the disadvantages of both compressed air energy storage systems and pumped hydro storage systems. In this chapter, a novel constant-pressure PHCA is proposed to solve the intermittent nature of renewable energy sources. The most significant characteristic of the constant-pressure PHCA is that the water pump and hydroturbine work under stable conditions, and this improves the working efficiency of the equipment without incurring an energy loss. Furthermore, the constant-pressure PHCA system has been analyzed in terms of energy and exergy in an attractive solution for the large-scale storage of existing intermittent renewable energy.
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