Power Quality Problems and Mitigation Techniques Case Study: National Tobacco Enterprise
| dc.contributor.advisor | Biru, Getachew (PhD) | |
| dc.contributor.author | Dagnew, Estifanos | |
| dc.date.accessioned | 2018-06-28T11:43:19Z | |
| dc.date.accessioned | 2023-11-28T14:26:35Z | |
| dc.date.available | 2018-06-28T11:43:19Z | |
| dc.date.available | 2023-11-28T14:26:35Z | |
| dc.date.issued | 2015-11 | |
| dc.description.abstract | The electrical energy is one of the easily used forms of energy and with the advancement of technology; the dependency on the electrical energy has been increased greatly. However, the quality of power being supplied is affected by various internal and external factors of the power system and the presence of power quality problems deteriorate the performance of the system. Nowadays power quality problem is an issue to the industrial customers. As a result, many of the industries in our country faced with the problem of power quality, having various causes. In this thesis work the assessment of power quality problems of National Tobacco Enterprise which is located in Addis Ababa and its mitigation techniques have been studied. The study focuses on investigating and identifying the power quality problems of the industry as per IEEE standards. The data required for the study is collected from the industry using Fluke 434/435 three phase Power Quality Analyzer and from recorded data. Based on the measurement the following data have been recorded; oscillatory transient that reaches two times as much the standard voltage, voltage sags which is less than 90% of the rms voltage, sustained power interruptions for 5-6 hrs per week, voltage unbalance of 2.62% and current distortions of THD value that reach 18.33%. The collected data have been analyzed and computer simulations are done using MATLAB/SIMULINK model to show the effectiveness of mitigation techniques. In this thesis pre-insertion resistor is used to mitigate the problem of oscillatory transient and the result indicates that the transient voltage reduced from 510 V to 230 V. For the problem of voltage sag, dynamic voltage restorer is identified as a solution and the results shows that the device restores the voltage for the three phases from 202.86 V, 201.25 V, and 200.33 V, respectively to 230 V. Single-tuned multi-branch filters that are 5th and 7th harmonic filters are designed and simulated for the mitigation of harmonic distortion and the filters are filtered out the harmonics and reduces the THD value from 18.33% to 3.97%. Standalone photovoltaic system is also designed as a solution to sustained power interruptions and for the problem of voltage unbalance redistribution of single phase loads equally among the three phases is taken as a mitigation technique. Key Words: Power quality, power quality assessment, National Tobacco Enterprise, IEEE standards, Mitigation Techniques, MATLAB/SIMULINK model. | en_US |
| dc.description.sponsorship | Addis Ababa University | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/4644 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Power quality; power quality assessment; National Tobacco Enterprise; IEEE standards; Mitigation Techniques; MATLAB/SIMULINK model | en_US |
| dc.title | Power Quality Problems and Mitigation Techniques Case Study: National Tobacco Enterprise | en_US |
| dc.type | Thesis | en_US |