Abstract: In order to solve the problem of heat dissipation in the process of producing hydrogen from

electrolytic water and generating electricity from fuel cells，an independent photohydrogen fuel cell thermoelectric

combined supply system was designed according to the principle of water cooling heat dissipation between

electrolytic cell and fuel cell. Based on this model，a control strategy was formulated to coordinate the output order

and size of each module，which solved the inefficiency of electrolytic cell in low power operation zone. The

capacity allocation model was established with the objective function of optimal comprehensive cost，and the

optimal capacity allocation result of the system was obtained by using the particle swarm algorithm. The simulation

results show that the overall cost of the configuration scheme proposed can be reduced by 2.2% compared with the

traditional configuration scheme，and it can meet the same starting and ending states of the hydrogen storage tank and the heat storage tank during the operation cycle. The long-term energy supply effect of the system is excellent，which can provide a reference value for the capacity configuration of the current stand-alone photohydrogen fuel cell cogeneration system.

      Key words: independent cogeneration system；fuel cell；waste heat utilization；capacity configuration