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Sökning: WFRF:(Laban Danilo)

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1.
  • Boricic, Alexandar, et al. (författare)
  • Dynamic Resistance Measurements and Result Interpretation for Various On-Load Tap Changers
  • 2019
  • Ingår i: 2019 IEEE MILAN POWERTECH. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538647226
  • Konferensbidrag (refereegranskat)abstract
    • Dynamic Resistance Measurement (DRM) is introduced in the last decade and provides more information about the condition of the OLTC than static measurements. However, there is little information available on how to interpret the results from the DRM for different types of tap changers and different faults. In this paper, different faults are introduced in a typical tap changer and it is then subjected to DRM tests. The test results are presented and interpreted. DRM measurements are performed on resistor-type and vacuum-type OLTCs and their DRM behavior is simulated in Simulink to compare with the measured results for further studies. Results demonstrate the possibility to determine and locate the likely cause of a problem in an OLTC, thus improving fault identification and further optimizing maintenance and reliability of a transformer.
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2.
  • Laban, Danilo, et al. (författare)
  • Storage System Design for Improved Primary Frequency Control From Hydropower Units
  • 2023
  • Ingår i: IEEE transactions on energy conversion. - : IEEE. - 0885-8969 .- 1558-0059. ; 38:3, s. 1836-1844
  • Tidskriftsartikel (refereegranskat)abstract
    • The upcoming modifications to the criteria for providing Frequency Containment Reserves (FCR) in the Nordic synchronous area present severe challenges for some hydropower units. By quantifying the difference between the required FCR power response and the actual response provided by the unit, an additional power response from an energy storage system can be specified to augment the hydropower unit, thus securing its participation in FCR in the future. A practical method to control the storage system, by applying a band-pass filter on the negative frequency deviation, is presented in this paper. The method is verified using a set of field measurements from Swedish hydropower units currently providing FCR. It is found that all tested units are able to satisfy the upcoming criteria with the specified storage systems. The optimality of the method is discussed by comparing the storage system power and energy ratings to the theoretical minimum. Obtained power ratings between 3% and 24% of the FCR power, combined with a short storage system duration of up to 2.5 minutes, indicate that the method presents a possible application for high-power and low-energy storage technologies.
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