信息元件可靠性对配电网馈线系统的影响

Influence of cyber components reliability for the feeder system in distribution networks

随着信息物理系统(CPS)的深度融合,需考虑信息与物理系统的耦合关系,建立配电网信息物理系统融合构架。首先,根据IEC 61850标准构建配电子站CPS模型,分析信息层与物理层的交互关系;考虑信息元件的延时、误动与拒动等非正常运行情况,枚举、分类及定义由信息元件触发的不同类型的物理层故障传播场景。其次,通过计算故障清除过程中不同物理层故障传播场景的概率,量化评估配电网信息元件对物理层的耦合作用。最后,以某地区10 kV配电网馈线系统为例进行故障场景计算分析,计算结果表明:信息元件故障会扩大物理层故障范围,其中以交换机通信链路故障的影响最为显著。

An integration framework of the distribution network cyber-physical system(CPS)is established in this paper.Firstly,the CPS model of the distribution substation is constructed according to the IEC 61850 standard and the interaction between the information layer and the physical layer is analyzed.Secondly,different types of physical layer fault propagation scenarios triggered by information elements are enumerated,classified and defined under the consideration of the abnormal operation conditions such as the delay,malfunction and refusal of cyber elements.By calculating the probability of different physical layer fault propagation scenarios during the fault clearing process,the coupling effect of distribution network information elements on the physical layer is quantitatively evaluated.A 10 kV distribution network feeder system in a certain area is taken as an example to carry out the calculation and analysis of the fault scenario.The failure of cyber elements expand the scope of physical layer failures,among which the communication link failure of the switch has the most significant influence.