在传统电力系统向电力信息物理融合系统CPS演变的趋势下,电力信息安全与电网的可靠运行密不可分,若仍将通讯系统视为完全可靠,则难以适应信息化程度较高的电力系统可靠性评估的要求.引入信息物理关联矩阵(CPIM)的方法,在传统配电网可靠性评估方法中考虑信息物理相依失效,并通过拓展后的IEEE Roy Billinton Test System算例,验证所提方法的有效性.基于算例结果分析了配电网自动化程度对可靠性的影响,同时比较了几种典型变电站主接线方式下,信息物理融合对可靠性的影响.结果表明,随着馈线断路器的数量增加,配电网可靠性得到的改善比信息相依失效带来的影响显著的多,证明了配电自动化推广带来的可靠性收益远大于其弊端.%Facing an overall trend of power system that the modem power system is developing towards a cyber-physical power system, electric information safety is closely related to the reliability of power grid. If the communication system is assumed to be reliable completely, it is difficult to adapt to the requirements of reliability assessment with high information degree. Cyber-Physical Interface Matrix (CPIM) is introduced, the influence of cyber part on distribution system reliability is considered. The example of expanded IEEE Roy Billionton Test System verify the effectiveness of proposed method. The comparisons on distribution system reliability between different protection schemes of main electrical connection in transformer substation and feeders are also discussed. As the result provided in this paper, when the number of circuit breakers in feeders increases, the improvement for reliability is far more than damage from Cyber-physical dependent failures,which means the development of distribution automation is an effective way to improve reliability for distribution system.
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