Abstract: The Siemens TELEPERM-XP distributed control system was adopted in Yangzhou Second Power Generation Corporation Limited Phase I Project. The coordination control mode based on the principle of boiler follow (BF) was used in the unit control, which has faster response speed, lower load change speed and larger steam pressure fluctuation at high load condition. In the second time optimizing commissioning organized by Yangzhou Second Power Generation Corporation Limited, more attention has been paid to maintain the stabilization of main stream pressure and to insure the parameters of every automatic control loop were easy to control during load change. The safety, stabilization and economy of unit operation was emphasized, and analysis of characteristics of controlled objects was emphasized too. After the optimizing commissioning, accuracy of automatic control has raised a lot.

Key words: coordination control system (CCS), direct energy balance, optimize