Method and system for calculating direct-current transformation current-carrying capacity of cable line

The invention provides a cable line direct current transformation current-carrying capacity calculation method and system, and the method comprises the steps: taking the current of each cable in a cable group as an optimization design variable, taking the core temperature of each cable as a state variable, and building an optimization model with the maximum cable group current-carrying capacity sum as an optimization target; and improving a convergence factor updating mode of the grey wolf algorithm, changing an optimization design variable within a change range after each calculation according to a single step length, and solving the optimization model by using the improved grey wolf algorithm to obtain the optimal current distribution of the cable group. The method has the advantages of being high in calculation convergence speed and accurate in calculation precision. 本发明提供了一种电缆线路直流化改造载流量计算方法及系统，将电缆群中各根电缆电流作为优化设计变量，各根电缆线芯温度作为状态变量，建立以电缆群载流量总和最大为优化目标的优化模型；对灰狼算法的收敛因子更新方式进行改进，按照单一步长在每次计算后将优化设计变量在变化范围内加以改变，利用改进后