Safety Control Strategy of Compressed Air Energy Storage Based on Variable Flow Control

Advanced adiabatic compressed air energy storage (AA-CAES) can improve the rate of new energy consumption, and it is a key technology for new power systems. Since the compressor of the AA-CAES system adopts a centrifugal compressor, there is a phenomenon of surge and blockage during the operation, which seriously affects the safe operation of the system. In this paper, the safety control strategy of the compression side of the AA-CAES system is investigated. Firstly, a simple judgement method of the surge and blockage phenomena based on the slope of the compressor mass flow rate is proposed, and the range of the compressor's allowable mass flow rate of air flowing through the compressor at a given rotational speed is determined. Then, the anti-surge and blockage control strategy of the compression subsystem is designed to limit the range of compressor air mass flow rate by controlling the angle of the inlet guide vane of the compressor using the variable flow method. Finally, simulations are carried out under the start-stop condition and grid-connected operation condition to verify the effectiveness of the control strategy.