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All Journal International Journal of Advances in Applied Sciences Bulletin of Electrical Engineering and Informatics Indonesian Journal of Electrical Engineering and Computer Science
Nura Musa Tahir
Abubakar Tafawa Balewa University
Earth & Planetary Sciences Electrical & Electronics Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics

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Feasibility analysis of single wire earth return system for potential application in rural electrification in Nigeria Sani Sabo Mohammed; Nura Musa Tahir; Usman Bature Isyaku; Ahmad Bala Alhassan; Abdulrazak Sabo
International Journal of Advances in Applied Sciences Vol 11, No 1: March 2022
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (560.035 KB) | DOI: 10.11591/ijaas.v11.i1.pp88-96

Abstract

Traditionally, three-phase networks are used to transmit electric power to consumers. However, due to its high initial cost, many isolated rural communities are yet to have access to electricity. Thus, the single wire earth return (SWER) architecture, which uses the earth as the return path, attracts significant cost savings. In this paper, the potential application of the SWER system for rural electrification in Nigeria was presented. The cost-effectiveness of the SWER system which is about 70% less than the three-phase configuration, is due to the need for fewer cables, pole-top fittings, switching, and protection devices. Initially, the dynamic modeling of the equivalent SWER system was derived for the MATLAB simulation analysis. The pertinent parameters of the realized system, namely, micro-former leakage reactance, the resistive and inductive value of the single-phase network, were determined and employed for the SIMULINK and the repetitive power flow analyses. The results obtained from the power flow analysis and the simulation models for different loading conditions were found to agree with an error margin of +5%. This demonstrates that the proposed prototype can be adopted to reduce the prevalent energy poverty and thereby improved the quality of life of rural dwellers in Nigeria.
Comparative analysis of observer-based LQR and LMI controllers of an inverted pendulum Nura Musa Tahir; Mustapha Muhammad; Musa Idi; Salinda Buyamin; Ladan Maijama’a; Sa’id Musa Yarima
Bulletin of Electrical Engineering and Informatics Vol 9, No 6: December 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v9i6.2271

Abstract

An inverted pendulum is a multivariable, unstable, nonlinear system that is used as a yardstick in control engineering laboratories to study, verify and confirm innovative control techniques. To implement a simple control algorithm, achieve upright stabilization and precise tracking control under external disturbances constitutes a serious challenge. Observer-based linear quadratic regulator (LQR) controller and linear matrix inequality (LMI) are proposed for the upright stabilization of the system. Simulation studies are performed using step input magnitude, and the results are analyzed. Time response specifications, integral square error (ISE), integral absolute error (IAE) and mean absolute error (MAE) were employed to investigate the performances of the proposed controllers. Based on the comparative analysis, the upright stabilization of the pendulum was achieved within the shortest possible time with both controllers however, the LMI controller exhibits better performances in both stabilization and robustness. Moreover, the LMI control scheme is effective and simple.
Optimized output-based input shaping for control of single-link flexible manipulator using linear matrix inequality Nura Musa Tahir; Mustapha Muhammad; Bashir Bala Muhammad; Haliru Liman; Aminu Yahaya Zimit; Auwal Shehu Tijjani
Indonesian Journal of Electrical Engineering and Computer Science Vol 20, No 1: October 2020
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v20.i1.pp109-116

Abstract

Precise hub angle positioning due to tip deflections, flexible motions and under various payloads is enormous tasks in the control of single-link flexible manipulators. In this paper, output-based command shaping (OBCS) was designed using the system output for tip deflections and residuals vibrations suppression, and this was incorporated with a linear matrix inequality (LMI) closed-loop control scheme for precise hub angle positioning.  The robustness of the hybrid control scheme was tested by changing the payloads from 0g to 30g, and 50g. Simulation results showed that endpoint residuals vibrations and tip deflections due to flexible motions were suppressed and hence precise hub angle positioning under various payloads was achieved. Integral absolute error (IAE), integral square error (ISE) and time response analysis (TRA) were used as the performance indexes. Hence, the hybrid control scheme is simple and robust.
Co-Authors Abdulrazak Sabo Ahmad Bala Alhassan Aminu Yahaya Zimit Auwal Shehu Tijjani Bashir Bala Muhammad Haliru Liman Ladan Maijama’a Musa Idi Mustapha Muhammad Mustapha Muhammad Salinda Buyamin Sani Sabo Mohammed Sa’id Musa Yarima Usman Bature Isyaku