Robust primary frequency control in a system dominated by hydropower
(English)Manuscript (preprint) (Other academic)
Concerns about deteriorating quality of the Nordic grid frequency, including frequently occurring oscillations with a period of 40-90~s, has called for improved primary frequency control of the Nordic hydropower. In this paper, the parameters of the currently used PI controller with droop are optimised using a robust control approach. The trade-off between performance, actuator work and robustness is analysed in frequency domain and time domain, and the sensitivity to disturbances and model errors is discussed. It is found that the low-frequency oscillation of the system can be reduced by almost half if the parameters of the primary control are retuned.
Load frequency control, primary frequency control, hydraulic turbine, robust control, PID control
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject Engineering Science with specialization in Science of Electricity
IdentifiersURN: urn:nbn:se:uu:diva-237795OAI: oai:DiVA.org:uu-237795DiVA: diva2:768925