发电机中间过热时间常数对电力系统频率动态过程仿真影响

Influence of generator reheating time constant on dynamic frequency process in electric power system

针对电网频率质量造成的电网崩溃事故,讨论了单机带综合负荷系统模型引入蒸汽容积效应环节后,过热环节中发电机中间过热时间常数对系统频率动态仿真的影响。制定了轨迹评价指标,并通过仿真的方法获得发电机中间过热时间常数变化与轨迹评价指标变化的关系。实例验证:引入蒸汽容积效应环节后,发电机中间过热时间常数对于频率仿真曲线回升斜率的校核效果优于调差系数的效果,有利于电力技术人员在电网事故后,对电网频率动态过程进行再现分析。

This paper discusses the influence of generator reheating time constant on dynamic frequency simulation in reheating link after steam volume effect being brought to single - machine system model with aggregate load, formulates evaluation index for orbit, and works out the relation between the change of reheating time constant and that of tracking evaluation index by simulation. Experiment proves that after bringing in steam volume effect the checking of rebounding rate of frequency simulated curve by reheating constant is optimal than that by difference coefficient, which enhances the quality and security of electric power system running.