This paper studies a turbine-grid system through which an isolated power grid fed from CDQ steam turbine can be automatically switched over in running for critical electric consumers inside coke plant in case of power failure in the external grid.When the external power grid is resumed,the isolated grid can be automatically switched to the integrated grid to restore normal production as the quickest so that the potential risk of large-scale power outage due to the external grid failure can be avoided since the above-mentioned measures have strengthened the power grid stability of the coke plant.