摘要
现代电网已经具备信息-物理紧密融合的特征,电流差动保护是信息物理紧密耦合的典型应用,因此,有必要从信息物理融合的视角研究其可靠性。从物理-量测-通信-决策的完整闭环控制过程出发,分析线路电流、互感器测量误差、通信延时及保护判据(分析决策)等信息物理因素对电流差动保护的综合影响,提出电力信息物理系统视角下电流差动保护业务的误动概率模型。然后,通过仿真算例验证了模型的合理性,并分析了影响电流差动保护误动的关键因素。
Modern power system is developing into a cyber physical power system(CPPS).The current differential protection is a typical application with ICT and physical function tightly coupled.So it is necessary to study its reliability from the perspective of CPPS.On the basis of the closed-loop control process of physical-measurement-communication-decision making,the paper analyzes the integrated effects of cyber and physical factors,such as line current,measurement error of CT,communication delay and protection criteria,on the current differential protection,and proposes the mis-operation probability model of the current differential protection.On that basis,a simulation is performed to verify the model,and the key factors affecting the reliability are analyzed.
引文
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