Power quality: time-domain measurement, harmonic diagnosis, and suppression techniques

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Copyright: Dalvand, Hedayatollah
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Abstract
The current international standards on power quality and harmonics provide the definition of a set of power quantities as a common base for energy billing, evaluating electrical energy quality, detecting the sources of distortion, and designing mitigation equipments, such as power filters. However, they do not define or suggest any measurement methods for power quantities and detection of harmonic sources to quantify the flow of electrical energy and also determine the attribution of responsibility between customers and utilities. This work proposes a time-domain method for on-line precise calculation of power quantities and detection of the harmonic sources upstream or downstream the metering section. The distinctive property of the proposed method is its lower delay and higher accuracy compared to the others as it utilizes a recursive implementation of the Clarke-Park transformations in order to calculate the fundamental components of voltage and current waveforms that in turn avoids the low-pass filtering stage. This stage, required for the Direct Clarke-Park transformation-based method to obtain the fundamental components in synchronous rotating frame, results in uncertainty and delay. Extensive simulation and experimental results demonstrate the excellent performance of the proposed time-domain method for single-phase and three-phase systems under various operating conditions. On the other side, hybrid power filter is assumed the most effective equipment for harmonic elimination, reactive power compensation, and load balancing when required. However, several factors affect the tuning frequency of the passive parts of the filter over time; hence the current harmonics cannot be utterly eliminated. This work proposes a rotary variable reactor which is able to change the resonance frequencies of such passive parts, as required, in order to mitigate dominant harmonics. The effectiveness of the proposed hybrid power filter, including variable passive parts, is verified through the simulation for single-phase and three-phase applications. The results from this study reveal the integration of the functions of a power quality analyser and a smart metering system into a single box that will provide more intelligence about the customer interface with the utility grid as well as achieving the best performance of hybrid power filters over a wide range of cases.
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Author(s)
Dalvand, Hedayatollah
Supervisor(s)
Agelidis, Vassilios
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Publication Year
2011
Resource Type
Thesis
Degree Type
PhD Doctorate
UNSW Faculty
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