A Security-Constrained Unit Commitment Model for Power Systems with Compressed Air Energy Storage Stations

To address the challenges of the security and economic performance in power systems arising from the penetration of renewable energy, this paper proposes a Security-Constrained Unit Commitment (SCUC) optimization model that integrates the operational characteristics of Compressed Air Energy Storage (CAES). The established model mitigates the challenges of renewable energy volatility by leveraging CAES for load shifting, peak shaving, and renewable energy curtailment mitigation. A detailed mathematical formulation of CAES operation under isothermal conditions is developed, incorporating constraints for compressors, expanders, air storage tanks, and heat storage systems. The SCUC model minimizes system operational costs, while satisfying constraints for power balance, transmission capability, ramping rate, and etc. Case studies performed on an improved IEEE 39-bus system demonstrate that CAES significantly reduces operational costs, flattens the net load profile, and improves the operation of thermal units.