中文摘要：

基于IEC 61850的数字化变电站系统具有传统变电站系统所不同的结构与特点。现有的变电站可靠性分析方法多针对单装置或单间隔,鲜有针对整个变电站自动化系统。介绍了基于IEC 61850的数字化变电站系统的典型结构,分析了提高数字化变电站可靠性的主要方法,提出一种计算全站可靠性的方法。该方法将数字化变电站系统划分为通信系统、控制系统、保护系统以及站控层系统。利用可用性框图,分别计算每个子系统可靠性参数,然后通过系统可用性框图,计算出整个变电站的可靠性参数。利用该方法对一典型数字化变电站系统的可靠性进行了分析计算。结果表明,在合理采用装置冗余并采用基于IEC 62439-PRP的并行网络冗余后,数字化变电站系统的可靠性能够满足IEC 61508的要求。

英文摘要：

The digital substation system based on IEC 61850 is different from the conventional substation system in the architecture and the characteristics.While the method of the reliability analysis for a single device or a single bay has been studied extensivel y,the method for the entire substation automation system is still very limited so far.This paper analyzes the typical architecture of the digital substation,and shows the main methods to improve the reliability of the system.A method to calculate the reliability indices of the entire substation is then introduced.The method divides the digital substation system into communication systems,control systems,protection systems and station level system.Firs t,the availability block diagram is employed to calculate the reliability indices for each subsystem,and then the reliability indices of the entire substation are deduced.To demonstrate the metho d,the reliability indices of a typical digital substation are calculated and discussed.T he result shows that the reliability of the digital substation system can meet the requirements of IEC 61508 after adopting a reasonable device redundancy and network redundancy based on IEC 62439-PRP.