University of Twente Student Theses


Supercapacitor technologies to improve the power quality in dc microgrids

Lacina, F.R. (2023) Supercapacitor technologies to improve the power quality in dc microgrids.

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Abstract:Microgrids are a promising option to achieve the energy access goal given in the United Nations Sustainable Development Goal 7 and to use more renewable energy resources. However, especially in microgrids, power quality (PQ) is still important to consider. In this research the key question is how the implementation of energy storage devices (e.g. supercapacitors (SC) and Li-ion batteries) can improve the PQ issue of voltage and current fluctuation in a microgrid, focussing on the electrical characteristics that influence the transient response to inrush current events. This is investigated by performing simulations and experiments on a 12 V dc system with transmission line model and programmable load, where such an inrush current event is simulated with an instantaneous current draw of 5 A. SCs and Li-ion batteries have different electrical characteristics that influence the series resistance and series inductance of both. Taking this into account, simulation models have been made and simulations and measurements have been performed with both devices installed individually on both sides of the transmission line. Next to that, the series resistance and series inductance of the battery are increased to investigate the influence of both on the transient response. The simulations and measurements showed that the response is best when the storage device is located on the load side. Furthermore, the SC gives a better response than the battery. Another finding from the simulation is, that an increased series resistance and inductance lead to a lower and slower current output, respectively.
Item Type:Essay (Bachelor)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Subject:50 technical science in general, 53 electrotechnology
Programme:Electrical Engineering BSc (56953)
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