快速甩负荷功能对于维持电网及大型火电厂稳定运行具有重要的意义,布连电厂660 MW超超临界机组快速甩负荷（fast cut back,FCB）试验时，通过合理调整磨煤机跳闸次序及时间间隔，以及合理控制一、二次风和引风，能够维持良好的炉膛负压及锅炉的正常燃烧。探讨了对高、低压旁路的控制方式，以及汽温、汽压、凝汽器及除氧器水位等重要参数的控制策略，结果显示，各主要参数波动幅度小并能够迅速稳定，验证了控制策略的合理性和逻辑功能设计的完善性，为超超临界机组快速甩负荷试验提供经验借鉴。

The function of fast-cut back （FCB） is very important to maintain the stable of power grid and large thermal power plant. In the FCB test of 660 MW ultra-supercritical units in BuLian Power Plant, the normal combustion of boiler and the good furnace pressure could been maintained very well through the reasonable adjustment of coal mill trip order and intervals, as well as the coordination control of primary air, secondary air and induced air. The control method of HP and LP bypass, steam temperature and pressure, water level of condenser and deaerator were also discussed. The results show that the main parameters are fluctuated slightly and can be quickly stabilized. The rationality of control strategy and the integrity of logic function design are verified, which can provide references for the FCB test of ultra-supercritical units.