IEEE Power & Energy Magazine - May/June 2019 - 32

By Neil Kirby

H

HigH-power electronics Have been
employed in transmission and distribution systems for many years, using thyristor-based currentsource converters. this approach has seen approximately 200 high-voltage dc (Hvdc) systems and
more than 1,000 static var compensation systems
installed worldwide. the introduction of voltagesource converters (vscs) across the transmission and distribution voltage range has stimulated
significant interest in exploring many previously
inaccessible applications. ac network planners
have been striving to maintain the stability of ac
networks with an increasing load and an evolving
generation mix, seeking to more effectively integrate renewable energy at increasingly high power
levels. some significant trends may be identified in
the broader dc industry, with each trend having its
own timeline and drivers, including the following:
✔ an increasing preference for vscs instead
of the traditional line-commutated converters (llcs), increasing digitalization in
Hvdc systems
✔ the long-term goal in some regions to create dc grids
✔ the nearer-term increasing interest in the
use of medium-voltage dc (Mvdc), which
includes microgrids.

VSC Technology Dominating
New Projects
vscs are rapidly becoming the technology of choice in
some areas of the world, especially in europe, and for Hvdc
transmission projects with power ratings at or below approximately 1,400 Mw. the most common vsc in use presently is

the half-bridge modular multilevel converter (MMc), as seen
in Figure 1, arranged in the form of a symmetrical monopole circuit, as seen in Figure 2. as, in the coming years, the
current rating of vscs continues to evolve and increase with
existing and future semiconductors, it is anticipated that the
preference for vscs will continue to increase as well.

Current Trends
in dc

Voltage-Source Converters

Digital Object Identifier 10.1109/MPE.2019.2897406
Date of publication: 17 April 2019

32

ieee power & energy magazine

1540-7977/19©2019IEEE

may/june 2019



IEEE Power & Energy Magazine - May/June 2019

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2019

Contents
IEEE Power & Energy Magazine - May/June 2019 - Cover1
IEEE Power & Energy Magazine - May/June 2019 - Cover2
IEEE Power & Energy Magazine - May/June 2019 - Contents
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IEEE Power & Energy Magazine - May/June 2019 - Cover3
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