https://www.iiste.org/Journals/index.php/NCS/issue/feedNetwork and Complex Systems2022-09-06T06:07:38+00:00Alexander Deckeradmin@iiste.orgOpen Journal Systems<p><span id="internal-source-marker_0.04939836589619517">Network and Complex Systems <span id="internal-source-marker_0.04939836589619517">is a peer reviewed journal published by IISTE. The journal publishes original papers at the forefront of network and systems research. The journal is published in both printed and online versions. The online version is free access and download.</span></span></p><p>IISTE is a member of <a href="http://www.crossref.org/01company/17crossref_members.html">CrossRef</a>.</p><p>The DOI of the journal is: https://doi.org/10.7176/NCS</p><p><span><span><br /></span></span></p>https://www.iiste.org/Journals/index.php/NCS/article/view/59447Journal coverpage2022-09-06T06:07:38+00:00Journal Editord@d.comJournal coverpagehttps://www.iiste.org/Journals/index.php/NCS/article/view/59448Reliability Assessment of Power Distribution System Using Relative Customer Average Interruptions Duration Index Model2022-09-06T06:07:38+00:00Ganiyu Adedayo Ajenikokod@d.comRafiu Itopa Enitan Sannid@d.comIsaac Aina Omoyayod@d.comAdebayo Wasiu Ebodad@d.comSamuel Olatinsud@d.comSegun E. Oyebamijid@d.comPeter Ojekunled@d.com<p>Reliability assessment of power distribution system deals with the adequacy of overall system supply and indicates the system behaviour and response at the customer end. In order to attain satisfactory degree of reliability in electric power distribution system, there is the need to develop a model that will improve the three major system reliability indices via Systems Average Interruptions Duration Index (SAIDI), Systems Average Interruptions Frequency Index (SAIFI) and Customer Average Interruptions Duration Index (CAIDI). This research paper therefore, developed a Relative CAIDI model for assessment of reliability indices of electrical power distribution system. In this paper, ten (10) years outage data from selected distribution feeders of Ibadan, Ikeja and Port-Harcourt distribution systems were obtained and analyzed using curve fitting tools in MATLAB. The system reliability indices served as input parameters for the development of Relative CAIDI model. The best curves that fitted the relationship between the Relative CAIDI and the number of feeders were obtained using Lagrange polynomial functions, Newton polynomial functions and Chebyshev polynomial functions as performance evaluation metrics. The results showed that Ibadan, Ikeja and Port-Harcourt distribution systems had Relative CAIDI of 0.718, 0.3976 and 0.5279 respectively and the validation results produced by Largrange polynomial function, Newton polynomial function and Chebyshev polynomial function were 0.717, 0.3979 and 0.5278 respectively. The model developed is a polynomial of order six which depends majorly on the power requirements of the distribution systems. The developed model can be used for effective reliability assessment of electrical power distribution systems as well as forming a base-line information for system planning and maintenance strategies.</p> <p><strong>Keywords: </strong>Reliability Indices, SAIDI, SAIFI, CAIDI, Chebyshev Polynomial Function, Lagrange Polynomial Function, Newton Polynomial Function.</p> <p><strong>DOI:</strong> 10.7176/NCS/14-01</p> <p><strong>Publication date:</strong>August 31<sup>st</sup> 2022</p>https://www.iiste.org/Journals/index.php/NCS/article/view/59449Investigation of Distribution System Stability with Incorporation of Capacitor Switching: A Case Study of Monatan 11 Kv Distribution System2022-09-06T06:07:38+00:00Ganiyu Adedayo Ajenikokod@d.comTitilola Tunde Olayinkad@d.comIsaac Aina Omotayod@d.comAdebayo Wasiu Ebodad@d.comRaphael Oluwasegun Peterd@d.comOlayinka Isholad@d.comTaiwo Abassd@d.com<p>Effectiveness of an electrical distribution system depends on the stability of its voltage profile. Several methods such as Static Compensator (SC), Thyristor Controlled Series Compensation (TCSC) and Series Capacitor have been applied for the stability of the system. However, these methods have been characterized by harmonic variation and low efficiency. Therefore, this research paper applied Shunt Switching Capacitor (SSC) on 11 kV distribution system located at Monatan, Ibadan, Oyo State in order to investigate the stability of the system during outages. Hourly data on bus voltage of the system were collected to determine the average bus voltage and voltage drop of the distribution system for stability evaluation using IEEE statutory limits method. Load Flow Model (LFM) of the distribution system was developed with incorporation of Capacitor Switching Compensation (CSC). This was solved using Kirchoff’s Current Law( KCL) analysis to improve the average bus voltage and voltage drop of the distribution system while simulation was done using MATLAB R2015a. The results of the average bus voltage and voltage drop of the distribution system were 10.5 and 4.2 , respectively. The CSC model improved the average bus voltage and voltage drop by 6 % and 33 % respectively. The research showed that incorporating capacitor switching as a compensation technique enhanced the stability of the distribution systems. The research is useful in the planning and optimization of electrical distribution systems.</p> <p><strong>Keywords:</strong> Electrical Distribution System, Voltage, Capacitor Switching Compensation, Load Flow Models, Monatan 11 kV Distribution System, Voltage Drop, MATLAB.</p> <p><strong>DOI:</strong> 10.7176/NCS/14-02</p> <p><strong>Publication date:</strong>August 31<sup>st</sup> 2022</p>