为了研究地网中腐蚀支路对断裂导体诊断结果的影响程度,笔者基于二进制遗传算法编制了MATLAB地网导体断裂诊断程序。以重庆110 k V上桥变电站实际地网为例进行了8组仿真实验,对比分析了各组实验中不同腐蚀情况下的诊断结果和各节点电位...为了研究地网中腐蚀支路对断裂导体诊断结果的影响程度,笔者基于二进制遗传算法编制了MATLAB地网导体断裂诊断程序。以重庆110 k V上桥变电站实际地网为例进行了8组仿真实验,对比分析了各组实验中不同腐蚀情况下的诊断结果和各节点电位的变化,计算了不同导体断裂情况下适应度函数fitness值。利用支路灵敏度法分析了腐蚀支路存在对诊断结果的影响。结果表明:当地网未发生腐蚀或者发生轻微腐蚀时,诊断结果能准确找出断裂导体支路;当地网发生轻度、中度乃至严重腐蚀时,诊断结果中无漏诊、但会出现误诊的断裂导体支路。出现误诊的原因在于腐蚀支路位于不动点测量法中的不动点附近,通过剔除22节点的测量数据,4组仿真均能得到准确结果。展开更多
To gain the tradeoff between lower sidelobe and higher power amplifiers efficiency,a transmitting beam shaping scheme with limited amplitude weight values for satellite active phased array antenna is presented. The sc...To gain the tradeoff between lower sidelobe and higher power amplifiers efficiency,a transmitting beam shaping scheme with limited amplitude weight values for satellite active phased array antenna is presented. The scheme is implemented by a dual coding genetic algorithm(GA). Phase and amplitude of array weight vectors for beam shaping are encoded by real coding and finite length binary coding,respectively,which,maintaining accuracy of results,reduces the amplitude dynamic range and improves the efficiency of power amplifiers. The presented algorithm,compared with complex-coded GA,increases the convergence rate due to the search space's decrease. In order to overcome the prematurity and obtain better global optimization or quasi-global optimization,a new dual coding GA based on "species diversity retention" strategy and adaptive crossover and mutation probability are presented.展开更多
文摘为了研究地网中腐蚀支路对断裂导体诊断结果的影响程度,笔者基于二进制遗传算法编制了MATLAB地网导体断裂诊断程序。以重庆110 k V上桥变电站实际地网为例进行了8组仿真实验,对比分析了各组实验中不同腐蚀情况下的诊断结果和各节点电位的变化,计算了不同导体断裂情况下适应度函数fitness值。利用支路灵敏度法分析了腐蚀支路存在对诊断结果的影响。结果表明:当地网未发生腐蚀或者发生轻微腐蚀时,诊断结果能准确找出断裂导体支路;当地网发生轻度、中度乃至严重腐蚀时,诊断结果中无漏诊、但会出现误诊的断裂导体支路。出现误诊的原因在于腐蚀支路位于不动点测量法中的不动点附近,通过剔除22节点的测量数据,4组仿真均能得到准确结果。
基金The project supported by National Natural Science Foundation of China (No. 60572095)Research Foundation for Doctors of ZZULI
文摘To gain the tradeoff between lower sidelobe and higher power amplifiers efficiency,a transmitting beam shaping scheme with limited amplitude weight values for satellite active phased array antenna is presented. The scheme is implemented by a dual coding genetic algorithm(GA). Phase and amplitude of array weight vectors for beam shaping are encoded by real coding and finite length binary coding,respectively,which,maintaining accuracy of results,reduces the amplitude dynamic range and improves the efficiency of power amplifiers. The presented algorithm,compared with complex-coded GA,increases the convergence rate due to the search space's decrease. In order to overcome the prematurity and obtain better global optimization or quasi-global optimization,a new dual coding GA based on "species diversity retention" strategy and adaptive crossover and mutation probability are presented.