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Power quality analysis using relay recorded data

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dc.contributor.advisorSidhu, Tarlochan S.en_US
dc.contributor.advisorSachdev, Mohinder S.en_US
dc.contributor.committeeMemberShi, Yangen_US
dc.contributor.committeeMemberGokaraju, Ramakrishnaen_US
dc.contributor.committeeMemberDinh, Anh vanen_US
dc.creatorBirdi, Harjit Singhen_US
dc.date.accessioned2006-08-31T15:14:53Zen_US
dc.date.accessioned2013-01-04T04:55:55Z
dc.date.available2007-09-01T08:00:00Zen_US
dc.date.available2013-01-04T04:55:55Z
dc.date.created2006-08en_US
dc.date.issued2006-08-08en_US
dc.date.submittedAugust 2006en_US
dc.description.abstractDemand for electrical power is increasing everyday. Along with the increase in power demand, the characteristics of the loads are also changing. From being high power consuming, simple, robust loads, today loads are more efficient, but at the same time more sensitive. The performance and life of these highly sensitive loads depend a lot on the quality of power supplied to them. Power quality is any deviation of the voltage or current waveform from its normal sinusoidal waveshape. These disturbances include, but are not limited to, sag, undervoltage, interruption, swell, overvoltage, transients, harmonics, voltage flicker and any other distortions to the sinusoidal waveform. Occurrence of one or more of such disturbances is called a power quality event. Automatic classification of these disturbances is important for quick determination of the causes and to characterize possible impacts of the disturbances.Modern microprocessor based protective relays have numerous integrated functions that allow them to provide information on power quality events. It is proposed to utilize the existing numerical relays to analyze the quality of power at any point in the power system. The numerical relays can be programmed to capture the oscillographic waveform or any disturbance on the analogue signal or change of state of the digital signals and store it in the form of Common Format For Transient Data Exchange (COMTRADE) format. These records are then transferred to a central monitoring workstation for off-line analysis. This thesis describes a technique to automate the classification and analysis of the power quality events using relay recorded data. The technique uses voltage duration and magnitude (as specified in the IEEE Std. 1159 - 1995, IEEE Recommended Practice for Monitoring Electric Power Quality) of three phases to detect and classify the events. The classified results are then presented in a user-friendly graphical form. Fast Fourier Transform (FFT) is used to estimate the fundamental frequency and harmonic components in power systems. The graphical user interface of the power quality analysis tool is developed using Microsoft Visual C++ IDE and the algorithms are programmed in C++. The proposed technique was tested using data obtained by simulating different power system disturbances as well as on the data recorded by relays. The algorithms were able to classify the power quality events accurately. In the future, this facility will: enhance the real time monitoring of power quality and provide statistical analysis of available power quality data. From the utility viewpoint, it would allow them to monitor power quality in a cost effective manner and assist in preventive and predictive maintenance besides helping them to fix differential tariff based on the quality of the delivered power. It may also turn out to be a smart tool for them to penalize the consumer polluting the power quality.en_US
dc.identifier.urihttp://hdl.handle.net/10388/etd-08312006-151453en_US
dc.language.isoen_USen_US
dc.subjectImpulsive Transientsen_US
dc.subjectTransientsen_US
dc.subjectHarmonicsen_US
dc.subjectPower Qualityen_US
dc.subjectDatabase Integrationen_US
dc.subjectOscillatory Transientsen_US
dc.subjectRelay Recorded Dataen_US
dc.subjectOvervoltageen_US
dc.subjectInterruptionen_US
dc.subjectUndervoltageen_US
dc.subjectSagen_US
dc.subjectSwellen_US
dc.subjectPower Quality Eventsen_US
dc.subjectImportance of Monitoring Power Qualityen_US
dc.subjectLocations for Monitoring Power Qualityen_US
dc.subjectPower Quality Monitoring in Protective Relaysen_US
dc.subjectReal Time Power Quality Monitoringen_US
dc.subjectUtility Customer Contractsen_US
dc.subjectPower Quality Standardsen_US
dc.subjectQuinn Curtis Graphics Libraryen_US
dc.subjectMicrosoft Visual C++en_US
dc.subjectStatistical Analysisen_US
dc.subjectPower Systems Computer Aided Designen_US
dc.subjectComtrade Recorden_US
dc.titlePower quality analysis using relay recorded dataen_US
dc.type.genreThesisen_US
dc.type.materialtexten_US
thesis.degree.departmentElectrical Engineeringen_US
thesis.degree.disciplineElectrical Engineeringen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US

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