中文摘要：

目前进行电力系统频率稳定研究主要是将系统进行单机单负荷等值，采用单机单负荷模型。该模型主要是基于hnderson提出的低阶系统频率响应模型，其忽略了锅炉及辅机对系统动态频率的影响。在低阶系统频率响应模型基础上，建立了一个包含电厂锅炉、辅机及机组控制系统的简单闭环模型，用于电力系统频率稳定研究。该闭环模型计及了由锅炉效应及厂用电驱动的辅机设备的频率效应。仿真对比了系统在遭受同一扰动时，锅炉主蒸汽压力恒定、辅机由无穷大电源供电及考虑辅机由厂用电电源供电三种情况下系统的动态频率。仿真结果表明，当系统所遭受的扰动较大时，锅炉及辅机设备对系统动态频率的影响不应被忽视。

英文摘要：

The primary method for power system frequency stablity study currently is to make the equivalent of the power system into a sigle-machine with centralized load which based on Low-order System Frequency Response （SFR） model proposed by Anderson. Usually, the influences of boiler and auxiliaries on power system dynamic frequency are ignored. A simplified close-loop dynamic model based on SFR model of coal fired power plant for power system dynamic frequency study is proposed. The boiler, auxiliaries and unit control system are included in this model. The induction motors＇ frequency characteristic of auxiliaries powered by plant power is also considered in the closed loop model. Simulations and comparisons of power system dynamic frequency have been done among the systems with constant steam pressure, auxiliaries powered by infinite power source and auxilairies powered by plant-power. The simulation results show that the effect of boiler and auxilairies should be taken into account when the power system is under large disturbances.