OPTIMIZATION STUDY ON OPERATION OF HOUSEHOLD HYDROGEN ENERGY SYSTEM CONSIDERING THERMAL LOAD FLEXIBILITY

Aiming at the challenge of the random and intermittent characteristics of wind power/photovoltaic output to the reliability of combined heat and power supply of household hydrogen energy system，an optimization strategy of combined heat and power supply of household hydrogen energy system based on flexible relaxation operation constraint of heat load is proposed. Firstly，the infrastructure of household hydrogen energy system including different modules is built，and the operation principle of the system is described in detail. Secondly，the mathematical model of the key links in the system is established，and the range of the average hydrogen/heat ratio of the electrolytic cell and the electric/heat ratio of the fuel cell at different temperatures are determined. Then，in order to take consider the user’s comfort and the flexibility of the heat load，the heat load demand of the household hydrogen energy system is adjusted according to the thermal sensation average scale prediction index. Finally，considering the capacity limitation of hydrogen storage tank，the electric/thermal power of hydrogen energy equipment and the flexible thermal energy demand of user side，the optimal operation model of household hydrogen energy system is established with the goal of minimizing the total investment cost and the abandonment rate of new energy. The simulation results show that the introduction of flexible heat load for operation adjustment not only enhances the consumption capacity of renewable energy，but also significantly reduces the operating cost of the system. © 2024 Science Press. All rights reserved.