Modeling large modern fossil-fueled steam-electric power plant and its coordinated control system for power system dynamic analysis

Fossil-fueled steam-electric power plants have many outstanding advantages and are still one of the main power types in the world especially for non-European countries. The classic mathematic models are designed for traditional hydraulic governing steam turbine units. Single turbine and its control system models are used wildly for dynamic analysis in power system. Digital electro-hydraulic (DEH) control systems and coordinated control systems (CCS) are used in most of the modern large power boiler-turbine units. They are key elements in the operation of the power station and have great impact on the system responses to the frequency or load disturbances. But seldom researches are available for modern generation unit models with both CCS and boiler control systems. A general model of power plant with CCS control system is built for power system dynamic analysis. The proposed model is compared with the classic ones under given disturbance inputs. The simulated results show the CCS should be considered in power plant modeling for power system dynamic analysis.