• norsk
    • English
  • norsk 
    • norsk
    • English
  • Logg inn
Vis innførsel 
  •   Hjem
  • Fakultet for informasjonsteknologi og elektroteknikk (IE)
  • Institutt for elkraftteknikk
  • Vis innførsel
  •   Hjem
  • Fakultet for informasjonsteknologi og elektroteknikk (IE)
  • Institutt for elkraftteknikk
  • Vis innførsel
JavaScript is disabled for your browser. Some features of this site may not work without it.

Modular Multilevel Converter Control for HVDC Operation: Optimal Shaping of the Circulating Current Signal for Internal Energy Regulation

Bergna-Diaz, Gilbert
Doctoral thesis
Åpne
Fulltext not available (Låst)
Permanent lenke
http://hdl.handle.net/11250/2374615
Utgivelsesdato
2015
Metadata
Vis full innførsel
Samlinger
  • Institutt for elkraftteknikk [1597]
Sammendrag
ELECTRICITY will most probably be the dominant form of energy in the upcoming

future. Triggered by the decline of fossil fuels along with their elevated

and volatile prices, the threat that they represent to national energy security, and

growing environmental concerns as consequence of their negative effect on climate

change, Europe has decided to undertake an ambitious and multidisciplinary project

called the SuperGrid. Such an initiative will serve as a transcontinental highway

for renewable energy, [1], allowing for geographical smoothing effects to help minimize

the disadvantages inherent to the intermittent renewable sources. In more

simple words, this so-called SuperGrid will interconnect the offshore wind and wave

power from the North sea, with the photovoltaic (PV) and concentrated solar power

(CHP) from the south, as well as geothermal and biomass generation, and indeed,

large hydro-power dams (located in Norway and Switzerland among other countries)

that will serve as Europe’s energy storage. The main challenge is of course the

continental-size distances of the interconnections, which were not possible using the

traditional AC technology. Nowadays, such ambitious projects have become feasible

as high voltage direct current (HVDC) technology enters the scene, thanks to

semi-conductor breakthroughs and advances in power electronics; more precisely,

voltage source converters (VSC)-based high voltage direct current (HVDC) links.

It seems to be getting clear that the Modular Multilevel Converter (MMC) proposed

by Professor Marquart in 2003 [2] has emerged as the the most suitable power

converter for such application, since it has several advantages with respect to its

predecessors, such as its high modularity, scalability and lower losses.

When this research project was undertaken in 2011, there was not yet a clear

control strategy defined that could be used to operate the MMC in an optimal and

stable manner since the topology was still very new. Moreover, this strategy needed

to take into account the final HVDC application and withstand grid fault scenarios.

Thus, the present Thesis was carried out with the aim of overcoming such crucial issues,

by proposing a control philosophy in the MMC natural phase coordinates that

was obtained from the application of mathematical optimization using Lagrange

multipliers to the energy-based model of the MMC for balanced and unbalanced

grid conditions. Furthermore, global asymptotic stability issues involving theMMC

were addressed, and a simple and local approach for ensuring the global stability of

the complex MMC-multi-terminal HVDC system was implemented.
Utgiver
NTNU
Serie
Doctoral thesis at NTNU;2015:143

Kontakt oss | Gi tilbakemelding

Personvernerklæring
DSpace software copyright © 2002-2019  DuraSpace

Levert av  Unit
 

 

Bla i

Hele arkivetDelarkiv og samlingerUtgivelsesdatoForfattereTitlerEmneordDokumenttyperTidsskrifterDenne samlingenUtgivelsesdatoForfattereTitlerEmneordDokumenttyperTidsskrifter

Min side

Logg inn

Statistikk

Besøksstatistikk

Kontakt oss | Gi tilbakemelding

Personvernerklæring
DSpace software copyright © 2002-2019  DuraSpace

Levert av  Unit