An increased share of electricity production from variable energy sources, especially wind and solar power, and loss of inertia in the system, result in higher demands of frequency control. In the last decades, the quality of the grid frequency in the Nordic power system has gradually deteriorated. This thesis has examined if an introduction of a new frequency control service, called fast FCR‑N, can improve the frequency quality. Today, almost all of the frequency control in the Nordic countries is provided by hydropower units. Whether fast FCR-N can reduce wear and tear on the hydropower units was also studied. Numerical simulations of a one-area model representing primary frequency control and the Nordic electrical grid were carried out in Matlab Simulink. Two different designs of fast FCR-N, proportional and deadband design, were introduced in the system. The system performance regarding frequency quality and hydropower control work was evaluated. The results show that both proportional and deadband fast FCR-N improve the system performance. Still, studies on a future scenario, assuming less inertia and frequency dependent load in the system, indicated that further actions need to be taken to get significantly better frequency quality in the future compared to today.
| Identifer | oai:union.ndltd.org:UPSALLA1/oai:DiVA.org:uu-320126 |
| Date | January 2017 |
| Creators | Olsson, Helena |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Student thesis, info:eu-repo/semantics/bachelorThesis, text |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | UPTEC ES, 1650-8300 ; 17 003 |
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