Power quality analysis based on root mean square and discrete fourier transform / Noor Asilah Yaacob
Power Quality (PQ) disturbance is the most significant power issues concern by the customer side due to degradation of the power quality. The root cause of PQ disturbance can be identified by analyzing the characteristics of disturbances. From that, appropriate action can be conducted. The PQ dis...
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| Format: | Thesis |
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2018
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| Online Access: | http://studentsrepo.um.edu.my/12193/ http://studentsrepo.um.edu.my/12193/1/Noor_Asilah_Yaacob.jpg http://studentsrepo.um.edu.my/12193/8/asilah.pdf |
| Summary: | Power Quality (PQ) disturbance is the most significant power issues concern by the
customer side due to degradation of the power quality. The root cause of PQ disturbance
can be identified by analyzing the characteristics of disturbances. From that, appropriate
action can be conducted. The PQ disturbances in the voltage waveform are very difficult
to identify using normal human sight. It is also difficult to analyze the PQ disturbance
manually because of dealing with the huge sample of data waveform. Besides, the method
in sag magnitude determination should be improved to get more relevant result. This
project presents two methods for analyzing the PQ disturbance based on Root Mean
Square (RMS) and Discrete Fourier Transform (DFT). A new technique is introduced to
determine the voltage sag magnitude. This method is applied to the voltage waveform
data as provided by the IEEE 1159.2 PQ event working group using MATLAB
programming. The proposed method for sag magnitude determination is added by
modifying the program of RMS and DFT measurement using Rectangular Approximation
technique. For the result, the RMS and DFT method can use to analyze the voltage sag
event. Both methods able to analyze the voltage sag detection time, sag duration and sag
magnitude. The comparison performance between RMS and DFT method in voltage sag
analysis is presented. The analysis result is affected by the sliding window technique and
the size of the rectangle in the sag magnitude determination. For future work in this
project, the method can be modified to analyze other types of PQ disturbances like swell,
transient and harmonics for more practical. |
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