中文摘要：

分析和总结了目前现有的接地网腐蚀诊断方法，提出了基于动态混沌粒子群优化算法的分块诊断方法。该方法针对不规则接地网拓扑结构，将其分块成规则的子模块，并根据电路分析原理，建立了数学关系模型及诊断方程组。通过诊断模型的优化和采用动态混沌粒子群优化算法来求解，以搜索全局最优解。该方法降低了诊断方程组的病态程度，提高求解精度。通过适应度评价准则动态增减混沌粒子数目，从而达到既提高了求解精度和加快求解速度的目的。通过某变电站地网结构的实际算例分析，证明了该算法的可行性。

英文摘要：

All the approaches applied now in the field of grounding grid corrosion diagnosis are analyzed, and a theory based on dynamic chaotic PSO is proposed. Such an approach aiming at abnormal topological structure divides the whole grid into regular small parts, and uses circuit theory to construct the equation of diagnosis. Also, dynamic chaotic PSO helps to optimize the algorithm and improve its searching ability of optimization. Such an approach betters the situation of the illness of the equation, and increases the accuracy. By the evaluation of dynamic principle, changing the numbers of chaotic particles can improve both the accuracy and the speed of the solution. At last, application in a power station proves its feasibility.