随着可再生能源在电力系统中的普及，提高火电机组的一次调频(Primary Frequency Regulation， PFR)能力，从而抑制电网频率波动，是目前需要攻克的一个难题。然而，火电厂的灵活性运行在保证电网安全稳定运行方面挥发了重要作用。传统的火电机组一次调频策略采用协调控制系统(Coordinated Control System， CCS)、数字电液调节系统(Digital Electro-Hydraulic， DEH)，随着凝结水(Condensate Throttling， CT)和高加给水旁路节流(High-Pressure Heaters’ Feedwater Bypass， HPHFB)的改造，也能改善火电机组快速调频特性，因此，本文将CCS、DEH、CT、HPHFB四种控制方式相结合提出了新的调频策略。此外，为了提高火电机组的快速调频性能，将万有引力搜索(Gravitational Search Algorithm， GSA)算法和模糊增益调度策略相结合，提出了适用于多工况的火电机组快速调频策略，仿真结果验证改进控制策略的有效性。

With the popularization of renewable energy in the power system, improving the primary frequency regulation (PFR) capability of thermal power units to suppress grid frequency fluctuations is currently a difficult problem to overcome. However, the flexibility transformation of thermal power plants plays an important role in ensuring the safe and stable operation of the power grid. Traditional thermal units use coordinated control system (CCS), digital electro-hydraulic control systems (DEH), and with the transformation of condensate throttling (CT) and high-pressure heaters’ feedwater bypass (HPHFB), the fast frequency regulation characteristics of thermal units can also be improved. Therefore, this paper combines CCS, DEH, CT, and HPHFB to propose a new frequency regulation strategy. In addition, to improve the fast frequency regulation performance of thermal units, the gravitational search algorithm (GSA) and fuzzy gain scheduling control strategy are combined to suit for multiple operating conditions of thermal units, and simulation results verify the effectiveness of the improved control strategy.