The push for clean energy has caused a rapid growth of renewables in the electricity supply mix of the EU. Although one would assume that the impact of these technologies is entirely positive, recent research and experience indicate that there is reason for concern namely regarding the security of supply. In this context, the concern is how renewable energy sources (RES) affect the business case of conventional power generation. In response to this concern, capacity mechanisms are being considered or have already been implemented by various member states of the EU. However, in a highly interconnected electricity system, such as the one in Europe, there appears to be a risk that the uncoordinated implementation of capacity mechanisms may cause unintended cross-border effects. This research explored the performance of various capacity mechanisms in an electricity system with a strong growth in the portfolio share of variable renewable energy sources (RES). The cross-border effects of implementing various capacity mechanisms in an interconnected power system were also analyzed. In this research, two capacity mechanisms, namely a strategic reserve and a capacity market, were modeled as extensions to the EMLab-Generation agent-based model. Furthermore, two variations of a capacity market were analyzed. The first was a yearly capacity market design and the second was a forward capacity market with long term contracts. A survey of experts on the US capacity markets supplemented the modeling work with practical insights. / <p>QC 20161006</p><p>The Doctoral Degrees issued upon completion of the programme are issued by Comillas Pontifical University, Delft University of Technology and KTH Royal Institute of Technology. The invested degrees are official in Spain, the Netherlands and Sweden, respectively.</p><p>copyright (c) 2016 P. C. Bhagwat</p>

Most modern electricity markets do not guarantee that generation is reliable and sufficient to provide all consumer’s electricity needs at all times. This is due to design-flaws and regulatory intervention. During the coming decades, increased electricity demand and decarbonization trends will affect the electricity market greatly. As the share of wind and solar power increases in the generation mix, the inertia in the power system is expected to decrease. This can potentially increase the systems exposure to blackout risk. Therefore, it is important to ensure that electricity is traded in a way that ensures enough supply even during scarcity events. The study aims to compare six different capacity market designs that are widely discussed in the scientific literature. Furthermore, this study uses MATLAB to simulate how the utility for the strategic reserve in Sweden has changed over the past few years. The study finds no ideal capacity market design but concludes that different solutions come with their own advantages and trade-offs. The simulation results show that the utility of the strategic reserve in Sweden has increased during the last few years. Additionally, the simulation results suggest that demand for the strategic result varies on a daily time frame. / De flesta moderna elmarknader kan inte garantera pålitlig och tillräcklig produktion för att tillgodose konsumenters elbehov under alla tillfällen. Detta har att göra med brister i designen av elnätet och regleringar. Under de kommande decennierna kommer trender inom avkarbonisering att ha stor inverkan på elmarknaden. Med en ökande andel vind och solkraft som kraftproduktionsslag förväntas trögheten i kraftsystemet att minska. Detta kan potentiellt höja systemets utsatthet för strömavbrott. Därför är det viktigt att el handlas på ett sätt som försäkrar tillräcklig elförsörjning även under fall då produktionen är begränsad. Med målet att jämföra sex olika designer av kapacitetsmarknader som är etablerade i tidigare forskningsstudier. Vidare använder denna studie MATLAB för att simulera hur behovet av effektreserven i Sverige har ändrats under de senaste åren. Studien finner ingen ideal design för en kapacitetsmarknad, men fastställer att olika lösningar har sina egna fördelar och avvägningar. Studien finner vidare att behovet av effektreserven har ökat under de senaste åren. Dessutom indikerar simuleringsresultaten att behovet av effektreserven varierar med elbehovet under dag. / Kandidatexjobb i elektroteknik 2022, KTH, Stockholm