基于信息物理接口矩阵的IEC61850变电站自动化系统可靠性分析

随着电力系统通信控制网络和物理设备网络交互的加深,基于信息物理融合发展的变电站自动化系统的综合可靠性问题亟待研究。以IEC61850实际变电站自动化系统为例,基于变电站主接线建立其信息物理融合框架,在该框架下将信息层保护元件对物理层主要设备的影响进行分类,提出用信息物理接口矩阵表征故障传播类别的概率。考虑信息层的影响,建立变电站自动化系统可靠性分析方法,以实际变电站为算例进行了可靠性计算分析,验证了所提方法的正确性。结合算例进一步分析可靠性指标,结果表明信息层故障将明显增大系统的故障损失,而对系统连锁故障风险的影响相对较小。针对信息传输延时进行灵敏度分析,结果表明负荷点期望缺供电力的变化幅度随过程总线传输延迟率的增加而显著提升。

Reliability analysis of IEC61850 substation automation system based on cyber-physical interface matrix

With the deepening interaction between communication control network and physical device network in power system, the comprehensive reliability of the cyber-physical-based substation automation system needs to be studied urgently. The actual IEC61850 substation automation system is taken as an example, whose cyber-physical integrated framework is established based on the main wiring of substation. The influences of the cyber protection components on the main physical equipment are classified, and the cyber-physical interface matrix is proposed to represent the probabilities of fault propagation categories. The reliability analysis method of substation automation system is put forward considering the influence of cyber layer. And the reliability of an actual substation is calculated to verify the correctness of the proposed method. The reliability indexes are further analyzed with an example, and results show that the fault in cyber layer will obviously increase the power loss of the whole system, while it has relatively smaller influence on the risk of cascading fault. Finally, the sensitivity analysis of information transmission delay is implemented, which shows that the changing magnitude of expected demand not supplied increases significantly with the increase of the transmission delay rate of process bus.