University of Twente Student Theses
Power Quality Monitoring and Data Collection : High frequency analysis of line voltage
Graaf, T. de (2024) Power Quality Monitoring and Data Collection : High frequency analysis of line voltage.
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| Abstract: | The increased use of power electronics devices and more decentralized power generation has attributed to more issues regarding power quality. To study the sources of these issues a cheap power quality monitor was designed that can measure some power quality parameters with an interval of 2 seconds. This paper shows how to expand its functionality to do line voltage analysis on a higher frequency, while adding the least amount of components possible. The usability of the analog to digital converter (ADC) of the microcontroller (ESP32) present on the power quality monitor is assessed. It is determined that a sampling frequency of 500 kHz is needed for troubleshooting a voltage grid. This is sufficient to measure many harmonics of the 50 Hz grid and some impulsive phenomena. However, it might not be enough for showing phenomena caused by fast switching of switched-mode power supplies etc. Using the internal ADC a maximum sampling frequency of 768 kHz is achieved using I2S, which meets the requirements. The signal conditioning to make the line voltage measurable is however not sufficient for the ADC as voltage levels are too low. Because of this a 10 kHz test signal is considered as well as two static voltages. The FFT magnitude plot and performance of static voltage readings are compared for different sampling frequencies. It is found that noise performance increases with higher sampling frequencies. An alternative signal conditioning system that meets the requirements is proposed. |
| Item Type: | Essay (Bachelor) |
| Faculty: | EEMCS: Electrical Engineering, Mathematics and Computer Science |
| Subject: | 53 electrotechnology, 54 computer science |
| Programme: | Electrical Engineering BSc (56953) |
| Link to this item: | https://purl.utwente.nl/essays/101848 |
| Export this item as: | BibTeX EndNote HTML Citation Reference Manager |
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