The wind/photovoltaic/storage microgrid(MG)is an effective solution which achieves complementary advantages and efficient use of distributed sources. However

many factors affect the economics with various influences. The criticality of economic factors is quantified and analyzed in the wind/photovoltaic/storage MG. Based on the analysis of operation mode

the economic model of MG planning is built. The model is aimed at optimal annual net profit considering the operation characteristics of micro-sources

the power balance between the MG and the utility grid as well as the reliability constraints. Also

the evaluation indices of economic operation are established. On this basis

economic factors in both planning and operation aspects are quantified by calculating the influence coefficients. A practical MG in Yunnan Province is used as case study. The analysis results show that rational allocation of energy storage can improve the economics of MG planning

and the key economic factors of wind/photovoltaic/storage MG include the equivalent life cycles of energy storage

the unit investment cost of wind generators and the discount rate on the planning level

and the energy supplied

unit electricity price as well as unit environmental benefit of wind power and photovoltaic generation on the operation level.