Optimal Sizing of Energy Storage for Microgrid Systems Considering Energy Balance Ability Indicator

The strong uncertainties of the renewable power supply and load demand have a great impact on the safe and stable operation of the microgrid. The reasonable optimization of energy storage size is an effective means to efficiently absorb renewable energy and improve the operational reliability of the system. This paper builds a new energy storage size optimization indicator based on the stochastic network calculus (SNC), which can quantitatively analyze the ability of the microgrid system to maintain the source-storage-load energy balance under different energy storage size allocation scenarios, by combining existing conventional constraints and the investment cost indicator, we constructs a new optimization model for the storage size. The optimization results can effectively reduce the exchange amplitude of tie line power on the basis of economy. Finally, an example is given to verify the rationality and effectiveness of the proposed model and method.