Shanghai Xinhua DEH-ⅢA turbine digital electro-hydraulic controlling system has been widely applied in domestic power plants due to its friendly human-computer interface
flexible modularized configuration and mature controlling strategies.However
through analyzing the controlling process of operation with service power after units No.1 fast cut back(FCB) at Wanglong power plant
the system may not work well for the controlling scheme of units operation in an isolated-island way after the unit FCB.The controlling scheme for DEH-ⅢA system after units FCB was conducted and could be served as a reference for similar units.