Experimental study on the feasibility of isobaric compressed air energy storage as wind power side energy storage

The isobaric compressed air energy storage system is a critical technology supporting the extensive growth of offshore renewable energy. Experimental validation of the coupling control between isobaric compressed air energy storage and renewable energy sources, such as wind power, is essential. This study pioneers coupling experiments between isobaric compressed air energy storage and wind power. Unstable wind power generation is entirely absorbed by adjusting the piston compressor speed, ensuring that the actual power deviation from the target power does not exceed ±5% during the adjustment process. The experiment affirms that real-time absorption of unstable wind power is achievable through regulating the compressor speed via PID. Concurrently, maintaining a constant hot water temperature under variable load can also be accomplished by regulating the cooling water flow via PID, thereby ensuring the efficient operation of the energy storage system. Throughout the coupling regulation experiment involving energy storage and wind power, despite the constant variation in compressor load corresponding to wind power fluctuations, the exhaust pressure at each compressor stage remained essentially constant, and the exhaust temperature across all stages tended towards stability. The research findings establish a foundation for the application of isobaric compressed air energy storage in the development of offshore renewable energy.