Methodology for Fast Impedance Calculation for Twisted Power Cables at High-frequency via a Multi-level PEEC Method

Twisted power cables are widely used in distribution networks due to their ease of installation and low maintenance requirements. As twisted power cables are typically composed of multi-stranded conductors, their complex structure poses challenges for impedance calculation, which increases the difficulty of optimizing systems involving twisted power cables and analyzing lightning surge transients. The common approaches for twisted power cable impedance analysis suffer from significant calculation errors and are time-consuming. This paper proposes an efficient method based on a multi-level partial element equivalent circuit (PEEC) method to address these challenges, an algorithm that effectively models the intricate structure of twisted power cables while maintaining computational efficiency. Experimental validation and verification with analytical methods and finite element methods (FEM) show that the proposed method achieves high accuracy, with calculated values closely matching measured results and significantly reducing errors in resistance and inductance computations, demonstrating the advantages of our proposed approach, particularly in largescale cable models and high-frequency applications. This work provides a valuable method for impedance assessment with broad application potential in cable design optimization and transient analysis.