基于改进有功潮流介数的继电保护定值在线校核评估方法

Online protection setting assessment based on improved active power flow betweenness

为了使继电保护在线校核更高效合理,本文提出了按照保护重要度对继电保护定值进行顺序校核。该方法首先在有功潮流介数的基础上,引入信息熵的概念,计及了支路功率的方向性,克服了有功潮流介数指标忽略线路功率具有方向性的弊端,同时还考虑了电网的实际运行状态,物理背景更符合电力工程实际。然后考虑到各继电保护装置所属支路和节点的重要度不同,即保护的重要度不同,提出了将保护所属支路和节点的改进有功潮流介数之和作为保护重要度的评估指标,并以此给出了一种继电保护在线校核评估方法。最后通过仿真算例,验证了该方法的正确性和有效性。

It is presented to sequentially check the protection of values based on protection importance in order to make the online check relay protection more effective and reasonable.Firstly,the information entropy is introduced to consider the influence of power flow direction based on active power betweenness,which overcomes the shortcomings of active power betweenness ignoring directional line power flow.Meanwhile the power grid is considered as a directed and weighted network and the actual running state of line is taken into account,making the physical background even more suitable for the condition of the power system.Then,the protection of important degree is different when relay protection device is located in different place of the grid.The improved active power flow betweenness of line and node are integrated to measure the importance of different protections,and the protections are arranged according to the importance order from high to low.On the basis of the descending order of protection importance,all the protection of values can be verified online.Finally,the example of simulation shows that this method is correct and effective.