Abstract
This is a summary of a research into the further development of a proof-of-concept power quality (PQ) monitoring system and its functionalities. This system is called the multi-functional energy device (MFED), and has been developed by HyTEPS with as main goals; improvement of installation efficiency and providing more insight in the installation for end-users. Currently the system is installed at one customer, and a second field application is in the works. Specifically,two items were researched; integration of harmonic source detection and efficiency scoring according to the newly introduced NEN1010-8-1 efficiency scoring framework (derived from IEC60364).
Harmonics are researched because they are one of the main contributors to PQ problems, and cause significant losses. They are also known to distribute throughout the grid, causing problems at other locations. Therefore, it is of importance to indicate the main harmonic contributor at an electrical installation. The efficiency framework is looked into because it is a new addition to the
well-known industry leading NEN1010 that is the standard in the Netherlands, and it promises to asses installation energy efficiency including PQ. In the future, this score could be used for legislation or billing. This research analyses the contribution that integration of an MFED could yield according to this framework, and reviews its PQ sections. For the harmonic source detection, multiple methods from literature have been researched through simulations and a field-test.
The harmonic current vector method has been indicated to perform the best and provide the most usable information for the end-user. This method was able to determine contributions to the harmonic currents and voltages at the point of connection (POC) from either the utility grid or the customer installation with data retrieved from the MFED. However, the results of the method were subject to some limitations that affected the performance, and will need further research.
Therefore, currently the method in combination with the MFED is deemed to be only used as an indication of the main harmonic contributor. To improve on this, future research was suggested. Within this analysis, the output of the MFED system has also been positively validated with a pre-calibrated PQ analyser. The NEN1010-8-1 scoring framework has been analysed, with a focus specifically on its PQ sections. This analysis was partly conducted through a small-scale simula-
tion and partly through literature research. It has indicated that the application of the MFED can contribute significantly in obtaining a higher efficiency score, although this is not a certainty for improving actual efficiency.
In addition to this, especially many important indirect PQ aspects have been neglected due to the limited scope of the framework. The suggestion is made to improve upon this by enlarging the scope. This research concludes that in its current state the scoring framework can thereby be considered as a good start, but concerning PQ it is incomplete.
| Date of Award | 12 Oct 2021 |
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| Original language | English |
| Supervisor | J.F.G. (Sjef) Cobben (Supervisor 1) & C.N. van Dorst (External coach) |