Abstract: The current electrical control mode(DCS+ECS) of thermal power plant in the domestic was analyzed, it is pointed out that under this mode there is bottleneck for data communication, and some advanced functions, such as electric equipment information management, were difficult to implement. Under the instrument-electric integration power plant control system architecture, an electrical control system scheme was put forward which implement data exchange by means of communication with DCS, the full communication ECS will be located on the DCS plateform and can implement data exchange with DCS at various network layers, so the electrical hardware secondary connection of DCS will be cancelled. Several technical key points for realization of this ECS were analyzed, which includes networking mode, evaluation of communication performance and communication in the interval layers.

Key words: instrument-electric integration, electrical control system of thermal power plant (ECS), distributed control system of thermal power plant (DCS), full communication