Abstract: The coordination control system of boiler and turbine is widely used in thermal power plant which controls the turbine and the boiler as a whole. There are two aspects must be considered simultaneously in unit operation, the first is to use the boiler heat storage fully for fast response to load variation, the second is could not use the boiler heat storage excessively for the safety and stability of the boiler operation. The two aspects are conflict each other and must be treated properly. The inherent delay of boiler will badly influence on the response speed of power grid to load variation. There are three feedforward methods for resolution the inherent defect of boiler. The simulation experiment and comparison for the three methods were accomplished, and the advantages and disadvantages of each method were analyzed. The result provides a theoretical foundation for practical production.

Key words: boiler and turbine coordination control system, load control, feedforward control, simulation experiment, thermal power plant