Industrial and commercial loads have high requirements for power supply reliability and are usually equipped with diesel generators and fixed energy storage device such as backup power sources.However

these traditional backup power sources have drawbacks such as environmental protection problems

noise pollution and low asset utilization rate.For this purpose

it is proposed to use the photovoltaic-charging-storage microgrids(PCSMs) as the backup power sources for industrial and commercial load centers to replace the traditional backup power source.Based on this scenario

it studies the economic optimal dispatching method of the PCSMs.Firstly

it establishes an optimized dispatching model for power supply guarantee in industrial and commercial load centers.The objective function is to minimize the operating cost of the PCSMs

and the reserved discharge capacity when the energy storage system being used as a backup power source is considered in the constraint conditions.Secondly

through the calculation examples of typical industrial and commercial load centers

it verifies the validity of the established model.It analyzes four influencing factors

namely energy storage capacity

purchase cost of energy storage

electricity sales price and the limit value of energy storage batteries under the state of charge.Finally

it compares the optimization results of the PCSMs in the two cases of serving as a backup power source and not serving as a backup power source

which can provide a reference for the application of the PCSMs as a backup power source for the load center.