A dual-modular-multilevel-converter (MMC) structure is presented that allows multifrequency
power transfer between its ports. By exploiting a three-winding transformer, where the …

Considering stability, the loadability of long line ac transmission system is typically far below
its thermal limitation. To partially address this problem, a hybrid ac/dc approach is …

Electric power consumption has been increasing rapidly across the globe; this increase
specially accelerated in the last decade. Consequently, existing transmission lines are …

Hybrid ac/dc transmission can increase the power transfer capability of long ac transmission
lines. High voltage dc (HVDC) converters are needed, and the line-commutated converter …

This thesis investigates the use of flexible AC transmission systems (FACTS) and voltage
source converter (VSC) high-voltage direct current (HVDC) transmission systems for …

The increasing penetration of renewable source-based generators in the power grid has
paved the way for several hybrid power grid topologies. These topologies ensure efficient …

Solid dielectrics are often used as a barrier on grounded metal parts of electric apparatus.
This insulation barrier can be charged under DC and mixed voltages, which leads to …

Because of the need to maintain an adequate margin against transient instability, long extra
high voltage (EHV) AC lines cannot be filled to their thermal maximum. If the conductors are …

In modern electrical grids DC voltage is becoming more widely spread. In addition to the
need of coupling DC networks with the existing AC grids, DC networks of different voltage …

Power electronics as a subject integrating power devices, electric and electronic circuits,
control, and thermal and mechanic design, requires not only knowledge and engineering …