On the basis of obtaining the security power generation feasible interval of cogeneration unit with double extraction

a multi-objective

multi-constrained optimization model was established

taking the coal consumption for power generation

environmental performance and load dispatch speed as the multiple targets.The advantages of ergodicity and randomness of chaotic motion were applied to build hybrid genetic algorithm

on the basis of the chaotic variable step length-gradient descent.Then

the cogeneration heat/electricity load distribution was optimized

and by introducing penalty factor into constraints of the objective function

the fitness function was determined.The example calculation results show that:the above model not only effectively met the power grid requirement of load dispatch speed

but also reduced the unit comprehensive cost

which improved the comprehensive competitiveness of unit load and provided a scientific basis for load dispatch.