The diffusion of technology and knowledge is a salient feature in the technological change, innovation and growth of the modern society. Much attention is being given to the role of universities in the development of nations. Universities all over the world are playing a crucial role in producing competent professionals who will be taking responsibility of the country’s technology and resources. This goal of universities can be further fostered by a strong link with the industries. A strong bond and relation between universities and the industry helps not only in finding out immediate solutions to prevailing challenges in the industry but also will help in producing all rounded and sharp professionals who will later be important assets to the development of the country. http://ir.bdu.edu.et/handle/123456789/10154 2001-01-13T05:52:19Z 2001-01-13T05:52:19Z WONDIFERAW, ASMARE ALEMU http://ir.bdu.edu.et/handle/123456789/16546 2025-03-04T07:24:59Z 2024-08-01T00:00:00Z

A Comparative Study of Optimal Placement of D-STATCOM and DG to Power Loss Minimization and Voltage Profile Improvement. (Case Study: Bahir Dar Distribution Network) WONDIFERAW, ASMARE ALEMU This thesis addresses the challenges of radial topology in distribution networks, characterized by unidirectional power flow, a high R/X ratio, poor voltage stability, and increased power losses. The primary objectives are to minimize both active and reactive power losses, enhance the voltage profile, and conduct a comparative techno-economic comparison between the Distribution Generator (DG) and Static Distribution Compensator (D-STATCOM). The BIBC–BCBV-Matrix-Based Direct Load Flow (DLF) method is utilized to estimate power loss and voltage profile. A Multi-Objective Function (MOF) is formulated by summing four single objective functions with appropriate weight factors. The proposed methodology employs three optimization algorithms Genetic Algorithm (GA), Particle Swarm Optimization (PSO), and Hybrid GA-PSO to determine the optimal size and location of DG/D-STATCOM. Evaluation of the optimization methods is conducted on the Bahir Dar Distribution Network R5-G3 (68 buses) feeder. The integration of D-STATCOM using GA, PSO, and GA-PSO significantly enhanced the minimum PU RMS voltage to 0.946, 0.952, and 0.959, respectively, compared to the minimum base case value of 0.877. Additionally, D-STATCOM lowered real power loss by 41%, 48%, and 61% using GA, PSO, and GA-PSO, and reactive power loss by 37%, 47%, and 60%, respectively. Similarly, the integration of DG improved the voltage to 0.949, 0.956, and 0.963 using GA, PSO, and GA-PSO, respectively. Real power losses are reduced by 42%, 53%, and 65% with DG using GA, PSO, and GA-PSO, and reactive power losses by 42%, 53%, and 65%, respectively. By combining the GA and PSO algorithms in a hybrid approach, the proposed GA-PSO method has demonstrated significant improvements compared to the GA and PSO. The economic analysis, as indicated by the device cost, cost saving, and payback period, provides insights into the financial feasibility of implementing each technology. Regarding economic performance, the GA-PSO algorithm indicated the lowest payback period (2.6 years) for D-STATCOM technology. These results collectively underscore the effectiveness of the proposed optimization techniques in addressing power loss and voltage profile challenges in radial distribution networks. Keywords: PV-DG, D-STATCOM, GA, PSO, Hybrid GA-PSO, Power loss reduction, Voltage profile improvement, Forward-Backward Sweep, BIBC-BCBV Matrix.

2024-08-01T00:00:00Z Wondimnew, Feleke Abate http://ir.bdu.edu.et/handle/123456789/16544 2025-03-04T07:22:51Z 2024-06-01T00:00:00Z

PERFORMANCE ENHANCEMENT OF JIGJIGA CITY DISTRIBUTION NETWORK BY OPTIMAL PLACEMENT AND SIZING OF RENEWABLE DISTRIBUTED GENERATION: CASE STUDY: - JIGJIGA CITY 15KV, FEEDER 4 DISTRIBUTION NETWORK Wondimnew, Feleke Abate Integration of renewable distributed generation (DG) into urban distribution networks has emerged as a vital strategy for enhancing power system performance and sustainability. This thesis focuses on the performance enhancement of the Jigjiga City distribution network by determining the optimal placement and sizing of renewable DG units. The study aims to address the challenges of voltage drop and power losses issues in the existing distribution network. Optimal allocation and sizing of DG can be determined by applying particle swarm optimization (PSO) for multi-objective function using MATLAB software. By incorporating with technical criteria to identify the most effective DG deployment strategies, multi-objective optimization algorithms are utilized to evaluate various scenarios, ensuring an optimal performance improvement. The thesis also includes a comprehensive simulation of the distribution network under different DG integration configurations, assessing key performance indicators such as voltage profile and power loss reduction. The results of this thesis indicate substantial improvements in the network's operational performance, demonstrating the viability and benefits of renewable DG integration. The findings provide critical insights and practical guidelines for utility companies, policymakers, and stakeholders involved in the development of sustainable energy solutions for urban areas. The minimum voltage is improved from 0.9116p.u to 0.980p.u and the real power loss reduced by 82.7% as shown figure 4.5 and 4.6. Keywords: Voltage Profile, PSO, MATLAB software, Renewable distributed generation, optimal placement, optimal sizing, Distribution network, Power loss reduction, Multi-objective optimization.

2024-06-01T00:00:00Z Temesgen, Minwuyelet Lake http://ir.bdu.edu.et/handle/123456789/16543 2025-03-04T07:20:24Z 2024-02-24T00:00:00Z

Power Loss Minimization for Multiple Transmission Lines Using Interline Power Flow Controller, Case Study on Tana Beles Generation Substation. Temesgen, Minwuyelet Lake Electrical power system is very complex, continuously subjected to various type of disturbance ,which cause a lot of power system instability and lowers its efficiency. So it requires very careful design of new equipment’s which are needed to improve electric power utilization, enhancing power system stability, power loss minimization and power transfer capability. Power loss is the major problem which decreases the efficiency of electrical equipment , disturb the quality and stability of the system. Minimization this loss is very important to increase transmission power flow. Power loss reduction have been focused in this research to solve the challenges happens in transmission systems. This research analyze the impact of using interline power flow controller (IPFC) in the transmission line. An interline power flow controller (IPFC) is a FACTS device used to control multiple transmission line power loss. This device is selected for loss minimization due to its ability to control most power system parameters like active power, reactive power, bus voltage, line impedance and load angle. The research is properly modeled and conducted using MATLAB code /SIMULINK software. In this research Active and Reactive power loss have been done .Maximum possible limit of the power loss have been managed. Construction of new transmission line would be omitted and the transmission line transmit power at maximum limit. In this research the mathematical analysis and model of IPFC have been done. Active and reactive power reference value have taken from the maximum value of transmission line that is 450MW and 129Mvar respectively. The location of IPFC determined by interpolation method and placed at sending end bus. The resulted found from different load demand increment scenario at 25% overload, 50% overload and 75% overload, the active power improved by 23.41%, 27.31% and 31.14% respectively. The reactive power from different scenario i.e. 25% overload, 50% overload and 75% overload power the reactive power improved 45.93%, 53.90 %, and 60.26% respectively. Bus voltage result found with in a permissible limit. Keywords: Transmission Line Loss, Active and Reactive Power, Newton Raphson Algorithm, IPFC, Efficiency

2024-02-24T00:00:00Z Dejenie, Tilahun Bizuye http://ir.bdu.edu.et/handle/123456789/16542 2025-03-04T07:18:33Z 2024-07-01T00:00:00Z

A STUDY ON IDENTIFICATION OF THE FUNDAMENTAL CAUSES OF ELECTRICAL POWER INTERRUPTIONS AT GEFERSA SUBSTATION Dejenie, Tilahun Bizuye Distribution network substations play a crucial role in the power system by receiving highvoltage power from the transmission system and stepping it down to a lower voltage for distribution to consumers. However, failures in substation components can lead to power interruptions and reduce system reliability. This thesis aims to identify the root causes of component failures in a substation and propose mitigation solutions to improve system reliability. The failure modes and effects analysis (FMEA) technique is used to identify the root causes based on the risk priority number (RPN). The study focuses on the bus bar, transformer, and circuit breaker components in the Gefersa substation located in Burayu, Oromia region, Ethiopia.Using recorded data and observed data, nine root causes of bus bar failure, including arc flash, cracking of connections, and ohmic heating, are identified for RPN analysis. The root causes of circuit breaker failure include external and internal causes, partial discharge, loss of dielectric properties, and contamination.ddd causes of transformer failure, such as overloads and external short circuits, are also identified. To address these issues, corrective actions are proposed, including implementing arc flash protection equipment, conducting preventive maintenance, performing real-time voltage and frequency analysis, regular inspections, and upgrading the skills of technicians. Keywords: Failure Mode Effect and Analysis, interruption causes, reliability index

2024-07-01T00:00:00Z