Static Voltage Stability Assessment of the Kenyan Power Network
In recent years, the Kenyan Power Network has witnessed large growths in load demand. Although the increased load demand has somewhat been matched with an increase in transmission and generation capacity, the rate of expansion has not been matched with the rate of increase in load demand due to econ...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Journal of Electrical and Computer Engineering |
| Online Access: | http://dx.doi.org/10.1155/2021/5079607 |
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| author | Ombuki Mogaka Roy Orenge Julius Ndirangu |
| author_facet | Ombuki Mogaka Roy Orenge Julius Ndirangu |
| author_sort | Ombuki Mogaka |
| collection | DOAJ |
| description | In recent years, the Kenyan Power Network has witnessed large growths in load demand. Although the increased load demand has somewhat been matched with an increase in transmission and generation capacity, the rate of expansion has not been matched with the rate of increase in load demand due to economic, environmental, and geographical constraints. This has led to the system being prone to instability since it is being operated under stressed conditions. In the recent past, several studies have been carried out on voltage stability analysis and improvement using various conventional methods. However, conventional methods have various limitations in their utilization for voltage stability analysis. One solution to overcome these limitations is to employ a combination of one or more methods so as to get more information and greater degree of accuracy in voltage stability studies. In this paper, a methodology is proposed involving the combination of QV modal analysis, sensitivity analysis (VQ) and power-voltage curves in assessing the static voltage stability analysis taking a case study of the Kenyan Power Network. V-Q sensitivity analysis and QV modal analysis have been used to identify the load regions most susceptible to voltage instability and the corresponding weak buses in the network for various V-Q responses. Reactive power loss sensitivities for branches in the network have been used to determine the critical (weak) lines in the network. Loading margins (LM) and voltage stability margins (VSM) have then been used to determine the proximity to voltage collapse of the voltage weak buses identified by QV modal analysis. The effect of tripping one the critical lines on the voltage weak buses is also investigated. The current high voltage power network under the average peak loading conditions during the year 2019 is considered for the study. The paper also reviews existing voltage stability analysis methods and their limitations. |
| format | Article |
| id | doaj-art-159ef59f4ff54eb99b482f27c06cde02 |
| institution | Kabale University |
| issn | 2090-0147 2090-0155 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
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| series | Journal of Electrical and Computer Engineering |
| spelling | doaj-art-159ef59f4ff54eb99b482f27c06cde022025-02-03T06:43:33ZengWileyJournal of Electrical and Computer Engineering2090-01472090-01552021-01-01202110.1155/2021/50796075079607Static Voltage Stability Assessment of the Kenyan Power NetworkOmbuki Mogaka0Roy Orenge1Julius Ndirangu2Department of Electrical and Electronic Engineering, Jomo Kenyatta University of Agriculture and Technology (JKUAT), Nairobi 62000-00200, KenyaDepartment of Electrical and Electronic Engineering, Jomo Kenyatta University of Agriculture and Technology (JKUAT), Nairobi 62000-00200, KenyaDepartment of Electrical and Electronic Engineering, Jomo Kenyatta University of Agriculture and Technology (JKUAT), Nairobi 62000-00200, KenyaIn recent years, the Kenyan Power Network has witnessed large growths in load demand. Although the increased load demand has somewhat been matched with an increase in transmission and generation capacity, the rate of expansion has not been matched with the rate of increase in load demand due to economic, environmental, and geographical constraints. This has led to the system being prone to instability since it is being operated under stressed conditions. In the recent past, several studies have been carried out on voltage stability analysis and improvement using various conventional methods. However, conventional methods have various limitations in their utilization for voltage stability analysis. One solution to overcome these limitations is to employ a combination of one or more methods so as to get more information and greater degree of accuracy in voltage stability studies. In this paper, a methodology is proposed involving the combination of QV modal analysis, sensitivity analysis (VQ) and power-voltage curves in assessing the static voltage stability analysis taking a case study of the Kenyan Power Network. V-Q sensitivity analysis and QV modal analysis have been used to identify the load regions most susceptible to voltage instability and the corresponding weak buses in the network for various V-Q responses. Reactive power loss sensitivities for branches in the network have been used to determine the critical (weak) lines in the network. Loading margins (LM) and voltage stability margins (VSM) have then been used to determine the proximity to voltage collapse of the voltage weak buses identified by QV modal analysis. The effect of tripping one the critical lines on the voltage weak buses is also investigated. The current high voltage power network under the average peak loading conditions during the year 2019 is considered for the study. The paper also reviews existing voltage stability analysis methods and their limitations.http://dx.doi.org/10.1155/2021/5079607 |
| spellingShingle | Ombuki Mogaka Roy Orenge Julius Ndirangu Static Voltage Stability Assessment of the Kenyan Power Network Journal of Electrical and Computer Engineering |
| title | Static Voltage Stability Assessment of the Kenyan Power Network |
| title_full | Static Voltage Stability Assessment of the Kenyan Power Network |
| title_fullStr | Static Voltage Stability Assessment of the Kenyan Power Network |
| title_full_unstemmed | Static Voltage Stability Assessment of the Kenyan Power Network |
| title_short | Static Voltage Stability Assessment of the Kenyan Power Network |
| title_sort | static voltage stability assessment of the kenyan power network |
| url | http://dx.doi.org/10.1155/2021/5079607 |
| work_keys_str_mv | AT ombukimogaka staticvoltagestabilityassessmentofthekenyanpowernetwork AT royorenge staticvoltagestabilityassessmentofthekenyanpowernetwork AT juliusndirangu staticvoltagestabilityassessmentofthekenyanpowernetwork |