Design of a 4-Phase Intercell Transformer Converter for a Space Charge Measuring System

2018-09-03T10:00:15+02:00February 22nd, 2018|HVDC Cable Systems, Publications|

This paper presents the design of a power electronics converter to produce strong current pulses (about 400A) in the core of a HVDC cable in order to use the thermal step method to evaluate the ageing state of the dielectric component. The described converter uses a magnetic coupler with intercells transformers and is current controlled. Index Terms—magnetic coupler; intercell transformer; high current pulses; thermal step method; dielectrics.

Evaluation of HVDC cable impedance and admittance matrices by finite element method

2019-02-15T16:02:42+01:00February 21st, 2018|Publications, Supergrid Architecture & Systems|

In this work, a 2D Finite Element Method (FEM) is used to calculate the frequency dependent impedance and admittance matrices of underground and submarine cables. A harmonic magnetodynamic formulation is used to calculate the series impedances, and for the calculation of the parallel admittance an electrodynamic formulation is applied.

Robustness study of 1700 V 45 mΩ SiC MOSFETs

2019-02-15T17:06:33+01:00February 15th, 2018|Power Electronics & Converters, Publications|

The threshold voltage instability is a main reliability issue of Silicon Carbide MOSFET transistors. It is a critical parameter when it comes to give a failure in time rate for industrial power applications. In this context, a static ageing test based on JEDEC standard is proposed and the resulting gate oxide degradation is studied and discussed in this paper.

Numerical investigations of ReBCO conductors with high limitation electric field for HVDC SFCL

2018-08-23T10:15:48+02:00February 14th, 2018|High Voltage Substation Equipment, Publications|

Superconducting fault current limiters (SFCL) are already in operation in alternative current medium voltage applications and their use in HVDC grids is very promising due to their capability of reducing high short-circuit currents.