电网断面热稳定限额的计算

摘要

介绍了电网断面热稳定限额的计算方法和步骤，认为电网的负荷水平和开机方式是基础因素，而N-1故障的选择，是确定限额的关键；指出了针对故障后存在直流或负荷失却状况下断面限额计算方法。指出了在计算热稳定限额时，应首先确定电网负荷水平和机组出力安排，并根据元件阻抗和设备限额，选择最严重的N-1故障及最易过载的元件进行计算；在涉及直流或负荷切除的N-1故障时，应考虑直流或负荷切除对断面潮流的影响。%The calculation method and procedure are introduced in thermal stability limitation of transmission interfaces.In limitation calculation,the load level and unit output are the basics while the fault selection is the key factor.A calculation method is proposed in condition of DC or load loss in fault.It is proposed that in thermal stability limitation calculation,load level and unit output should be set first while most serious fault and most vulnerable element should be selected according to element impedance and equipment limitation.In relation to faults with DC or load loss,the influence on power flow must be taken into consideration.