A new method is proposed to calculate the heating coal consumption rate and power generation coal consumption rate at different heating loads and power generation loads. On this basis

the heating coal consumption rate curve and power supply coal consumption rate curve that change with the power generation load

as well as the maximum and minimum generating power at different heating loads

are fitted. By using the Lagrangian interpolation method

the curved surface of coal consumption rate of heating and power generation which changes with the power generation load and the heating load in feasible region is obtained. Combined with the local in-depth peak shaving policy and fuel cost

the real-time cost and profit of the cogeneration plant is accurately calculated. Finally

based on the self-adaptive genetic algorithm

the load distribution method that maximizes the total profit of the two units under the conditions of given heating power is determined. The final method can both give the current real-time cost and profit of the cogeneration company

and also give the best load distribution method during the current peak shaving period of the power plant

and guide the operation decision-maker to make the optimal operation strategy.