Research and Improvement of The Difficulties of FCB Function of Subcritical Units

摘要

Power plant will be threatened in the blackout, a tiny carelessness could result in serious damage to the equipment. FCB (FastCutBack) refers to the function that during the normal operation, because of the internal fault or external fault the unit take the moment to get rid of all external power supply instantaneously, and keep the boiler continue running at the lowest load to supply the auxiliary power. In this paper, the new designed FCB control strategy has been applied in a 350MW subcritical coal-fired unit. Through some control logic optimization and debugging, the viable control parameters is obtained, the result of unit FCB function test is excellent and the safety of unit are effectively improved.