基于禁忌搜索的接地网故障诊断

为了诊断接地网腐蚀情况,提出了一种基于禁忌搜索算法的接地网故障诊断方法。采用轮换激励位置和每处激励多处测量的方法,使可及节点得到更充分利用,观测信息显著增加。以可及节点间测量电压与估计电压偏差的平方和最小为适配值函数,以各个支路电阻的原始设计值为初始解,以支路电阻为禁忌对象,对各支路分别以某个确定步长增加和减少支路电阻的策略进行邻域搜索,并运用全局形式的藐视准则。对一个60支路的实验接地网分别选择15处以10A直流电流源进行激励,分别测量89处电压,运用提出的方法进行数据分析和故障诊断。结果表明,提出的方法可行,且具有对测量误差敏感性低的特点。

Fault Diagnosis for Grounding Grids Based on Tabu Search

A Tabu search based approach to diagnose the fault of grounding grids is presented.Shifting the positions of the current exciter within the touchable nodes and measuring the voltages between touchable nodes,the information of the grounding grid is remarkably increased.The index of the proposed method is to minimize the summation of the squared errors between testing voltages and evaluation values.The proposed Tabu search starts with the initial values of the designed resistances of the branches of a grounding grid.A tabu list is formed for the branches.In each iteration step,a set of neighborhood is formed by increasing or decreasing the resistance of each branch at a certain level respectively,while the other branches are not changed.The optimum one in the neighborhood without being tabooed is selected to be the solution of the corresponding iteration step.The global aspiration criterion is adopted,as well.Experiments are made on a grounding grid with sixty branches.A current exciter of 10A is injected at fifteen positions.Eighty-nine voltages between touchable nodes are measured.The diagnosis results show that the proposed approach is feasible and also has the advantage of not sensitive to the testing error.