Optimal allocation of energy storage in airport multi energy system with variable energy efficiencies

The airport multi-energy system (MES) operates economically, reliably and efficiently on the premise of ensuring the comfort of passengers. Configuring energy storage equipment in the airport MES can further improve the economy and reliability. Considering the variability of energy efficiency of MES equipments, an optimal allocation model of energy storage in airport multi energy system with variable energy efficiency is proposed. The objective function of the model is that the annual total cost of airport MES is the lowest, which includes the annual investment cost of energy storage, equipment maintenance cost, energy purchase cost and carbon emission cost. The variability of energy efficiency specifically refers to that the energy efficiency is not a constant marked on the nameplate, but changes with the change of part load ratio. The constraint of energy storage operation, the nonlinear relationship between energy efficiency and part load ratio make it difficult to directly solve the model, which is addressed by the big M method and the piecewise linear method respectively. The simulation results of an example show that,