Aiming at the problems of equipment selection and capacity configuration of roof integrated photovoltaic storage system

this paper proposes the method of roof photovoltaic equipment selection and capacity optimization configuration based on multi-energy flow balance network model.The equipment and energy flow in the integrated photovoltaic storage system are abstracted as the binary relationship between nodes and branches

and the multi-energy flow balance network modeling is constructed to portray the multi-energy flow coupling relationship and distribution characteristics within the system；through the analysis of the multi-energy flow balance network topology

the graph theoretic method of vertex graph decomposition is applied

and the energy flow correlation matrix between the aggregation-assignment vertexes and the equipment to be selected is formed

and the equipment to be selected is combined in the form of 0-1 variables.The problem of optimizing the capacity allocation of rooftop photovoltaic integrated system is introduced

and an integer linear programming model with comprehensive consideration of economic and energy-saving indexes

as well as equipment selection

capacity allocation and operation constraints

is established.Through simulation

the reasonableness and effectiveness of the proposed modeling method in improving the economy and energy utilization level of building roof integrated photovoltaic storage system are verified.