【摘要】 在对实际大区域电网进行频率动态过程的研究中发现,仿真所得的频率轨迹与量测装置记录到的实测轨迹偏差较大。解释了轨迹偏差产生的原因和特点,指出仿真系统中所采用的火电机组负荷调节系统模型中未考虑锅炉主蒸汽压力对频率动态过程的影响。根据分析,在仿真系统中自定义了计及锅炉动态特性影响的机组负荷调节系统模型。考虑锅炉动态特性对发电机组输出功率的影响,将模型中锅炉主蒸汽压力侧的影响等效为一阶惯性环节,应用调整后的模型进行仿真计算。为使频率动态过程的仿真轨迹与实测轨迹相接近,进一步修正了惯性环节中的时间常数。更多还原

【Abstract】 In the dynamic frequency process analysis of practical large power system,there are some evident errors between measured and simulated frequency trajectories.Its reason and characteristics are explained and it is pointed out that the impact of main steam pressure on dynamic frequency process is not considered in the unit load control model of simulation system.According to the analysis,the unit load control model based on the dynamic characteristics of boiler is built up in the simulation system.Considering the impact of boiler’s dynamic characteristics on unit output power,its influence at the main steam pressure side is treated as a first-order inertial element in the model for calculation.In order to make the simulated trajectory of dynamic frequency approaching to the measured one,the time constant is further modified in the model.更多还原