一种交直流系统连锁故障预测方法及风险评估  

AC-DC system cascading failure simulation method and risk assessment

作　　者：张晶晶[1] 陈博进 尉静慧 吴佳瑜 齐先军[1] 李小燕[1] ZHANG Jingjing;CHEN Bojin;WEI Jinghui;WU Jiayu;QI Xianjun;LI Xiaoyan(Anhui New Energy Utilization Saving Laboratory,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学安徽省新能源利用与节能实验室,安徽合肥230009

出　　处：《电力系统保护与控制》2021年第4期125-132,共8页Power System Protection and Control

基　　金：安徽省自然科学基金项目资助(1808085ME142);高等学校学科创新引智计划资助。

摘　　要：随着大容量直流线路的相继投运,交直流系统连锁故障预测模型的完善日益迫切。针对目前研究缺乏交直流相互作用过程的动态特性仿真,提出一种基于多时间尺度的交直流系统连锁故障预测方法。首先将连锁故障划分为3种时间尺度过程,并根据不同的时间尺度建立相应的仿真模型。其中短时间尺度过程考虑直流换相失败、暂稳、交流线路严重过载;长时间尺度过程考虑交流线路一般过负荷和重载开断,并包含短时间尺度;极长时间尺度过程考虑负荷波动,并包含长时间尺度。其次,以IEEE_(39)节点系统为例,对使用该预测方法形成的连锁故障过程进行分析,并与其他方法形成的连锁故障过程进行对比,主要从时间尺度特性及与实际的负荷情况两方面展示了预测方法所具有的优越性。最后对事故链各阶段不同控制措施的平均故障风险和有无直流调制的预测路径风险进行分析。结果表明:不同控制措施在不同阶段存在风险差异以及将直流调制加入控制措施中可减少控制代价。With the successive commissioning of large-capacity DC lines,it is increasingly urgent to improve the cascading failure prediction model for AC-DC systems.In view of the lack of dynamic characteristic simulation in current research on the AC-DC interaction process,a cascading failure prediction method for AC-DC systems based on multi-time scale is proposed.First,the cascading failures are divided into three time-scale processes and corresponding simulation models are established according to different time scales.Among them,DC commutation failure,temporary stability and severe overload of the AC line are considered in the short time scale process.The AC line general overload and heavy load interruption are considered in the long time scale process(long time scale process includes short time scale process).Load fluctuations are considered in the extremely long time scale process(extremely long time scale process includes long time scale process).Secondly,the IEEE_(39) node system is taken as an example and then the cascading failure process formed by using this prediction method is analyzed and compared with the cascading failure process formed by other methods.The superiority of the prediction method is mainly demonstrated from time-scale characteristics and consistency with the actual situation.Finally,the average failure risk of different control measures at each stage of the accident chain and the predicted path risk with or without DC modulation are analyzed.The simulation results show that different control measures have different risks at different stages and that DC modulation can be introduced into the control measures to reduce the cost of control.

关 键 词：交直流系统 连锁故障 多时间尺度 换相失败 直流调制 

分 类 号：TM721.1[电气工程—电力系统及自动化]