Continuum gradient-based shape optimization of conducting shields for power frequency magnetic field mitigation

A Survey on Optimization Techniques Applied to Magnetic Field Mitigation in Power Systems

“…There are only few cases where analytical expressions are derived [96,97,100,101], but these are usually based on simplified situations (infinite width shields, perfect magnetic or perfect electric materials, ferromagnetic cylindrical shields, etc.). So, numerical methods, such as FEM, are frequently preferred to address this problem [38,89,91,94,99,102,103]. Nevertheless, from the optimization point of view, this may imply more computational requirements and longer computation time, depending on the complexity of the analyzed system, so obtaining new analytical formulae for more realistic situations would lead to faster and more efficient optimization procedures for this mitigation technique.…”

“…However, shielding optimization has only been considered for UPC. In this sense, a first approach is presented in [102], where a continuum gradient-based shape optimization procedure for conductive shields installed over UPC is proposed. Its main objective is to optimize the shape of the plates for maximal MF reduction and a minimal amount of material for the shield.…”

Highly efficient shielding of high-voltage underground power lines by pure iron screens

“…It eliminates the air-gaps in the magnetic circuit of the shield, at the cost of pretty difficult maintenance operations on the cables. Solutions with open circuit configurations have indeed been proposed, with either pure conductive [9] or ferromagnetic materials [10], which are, however, quite less effective. In this paper, we therefore concentrate on a cable-enwrapping longitudinal structure obtained joining two doubly bent laminations, where air-gaps can be minimized by accurate machining operations and maintenance operations are easily done.…”