Improved FEM for distribution network cables rating using multiple forgetting factors least-square

Complicated surroundings of distribution network cables make it difficult to compute maximum ampacity according to actual operations. However, single numerical method for cable rating causes complex computation load which is not suitable for ampacity dynamic adjustment. This paper deals with the contradiction between simplicity and accuracy of the distribution network cables rating. A novel approach with the combination of an Improved Finite Elements Model (IFEM) and Multiple Forgetting Factors Least-Square (MFLS) for distribution network cables rating is proposed. One of key boundary conditions, heat dissipation coefficient is corrected dynamically in the IFEM to improve the accuracy of boundary calculations, which shows better performance compared with the classical FEM and the IEC Standard. In addition, the proposed method capitalizes on the power of MFLS method to attain the maximum ampacity with a lower computation load while the conductor temperature reaches prescribed value instead of iterations. M...