The optimized control methods used at present are mainly based on optimizing a single control quality

this isn't complete for the whole control system.For this

a design method for multi-objective optimization of the control system has been put forward

a number of optimizing objects being determined from view point of over all optimization for the control system

and seeking the optimal solution of the multiple objects by using the particle swarm optimization theory

so as to obtain the optimal set values.Directing against the established global fuzzy model for the thermal process

a constrained strategy based on fuzzy gain scheduling has been put forward

ensuring the global optimization ability of the said control system.The multi-objective optimization method has been used in the boiler-turbine coordinated control system of thermal power unit.Through wide range simulation under whole conditions of increasing and decreasing the load

results show that the said control strategy not only can satisfy the overall multi-objective requirements in the boiler-turbine system

but also has good load-tracking property and other control characters.