考虑发电机励磁保护和OLTC的多时间尺度连锁故障模型

Multi-Timescale Cascading Outage Model Considering Generator Excitation Protection and OLTC

世界范围内多次连锁故障和大停电事故表明,无功电压相关因素对连锁故障具有重要影响。提出了一种计及有载调压变压器(on-load tap changer,OLTC)和发电机励磁保护的多时间尺度大停电模型。该模型提出了对无功电压具有重要影响的发电机励磁保护和OLTC动作的建模方法,并进一步基于该模型提出了多时间尺度连锁故障模拟方法,实现了连锁故障动态过程的清晰描述,克服了传统连锁故障模型在此方面的局限性。文中用IEEE 30节点系统进行了连锁故障仿真计算,分析了发电机励磁保护、OLTC动作等与无功电压密切相关的因素对连锁故障的影响及机理,并揭示了连锁故障的若干阶段性特征。

Voltage and reactive power characteristics play an important role in cascading outages and blackouts in power systems. In this paper, a multi-timescale cascading outage model considering on-load tap changer （OLTC） and generator excitation protection was proposed. This model proposed a multi-timescale cascading outage simulation framework, in which clear expression of time in cascading outage simulation was realized, thus overcame limitation of traditional models. Modeling of generator excitation protection and OLTC simulation were introduced in this model. The IEEE-30 system case studies analyzed mechanisms of generator excitation protection and OLTC, and their influence on cascading outage risk and process. Moreover, phrasal characteristics of cascading outages are analyzed using this model.