Study of Power Reliability and Power Quality Problems of the Ethiopian-Djibouti Railway Distribution Networks
Mugisho Mugaruka Josue,
Getachew Biru Worku
Issue:
Volume 10, Issue 6, November 2021
Pages:
100-108
Received:
31 October 2021
Accepted:
19 November 2021
Published:
25 November 2021
Abstract: The structure of railway electrification system is a single-phase line, it uses power electronics devices and has a time varying load characteristic. This is a cause of considerable current unbalance, harmonics and variable reactive power consumption. This usually leads to power quality problems affecting the proper operation of the equipment. Because of the train's unique operation and electrification characteristics, power quality has been a major problem in railway networks. Throughout the history of railway electrification, many research were dedicated to power quality studies. A variety of power conditioning devices have been explored and deployed to traction systems. In this paper, a power quality problem investigation is done by evaluating and measuring major power quality parameters to confirm the mentioned problems on the Ethio-Djibouti railway line. The power quality quantities are measured using Chauvin Arnoux CA 8335 device and relevant data for power quality analysis are extracted using POWER log 5.8 software. Moreover, the power reliability is also evaluated for the same railway network by considering two substations, respectively the Hurso and Adigala substation. The power reliability studies are carried out by considering the recorded outage data due to Overvoltages for a period of one year. The measured data indicates a low power factor which even amounts 0.2, a maximum current unbalance values of 70% and harmonic distortion of 50%. The longest power outage due to over-voltage was 202 hours in January at Adigala substation with a power supply availability of 0.70 p.u in the 2020 years.
Abstract: The structure of railway electrification system is a single-phase line, it uses power electronics devices and has a time varying load characteristic. This is a cause of considerable current unbalance, harmonics and variable reactive power consumption. This usually leads to power quality problems affecting the proper operation of the equipment. Beca...
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Modelling and Simulation of Intelligent Master Controller Model for Hybridized Power Pool Deployment
Kufre Esenowo Jack,
Damian Obioma Dike,
Matthew Olubiwe,
Jude-Kennedy Chibuzo Obichere,
Nkwachukwu Chukwuchekwa,
Lazarus Okechukwu Uzoechi
Issue:
Volume 10, Issue 6, November 2021
Pages:
109-118
Received:
21 November 2021
Accepted:
9 December 2021
Published:
29 December 2021
Abstract: Every conceptual framework requires several developmental stages such as prototyping, preproduction and production stages. This paper considers prototype developmental stage which entails design, modelling and simulation for the conceptual system to determine suitable parameters and specifications before the production task is initiation. The inability to represent the conceptual control system with mathematical equivalence would hamper on the system operational efficiency, stability, controllability and observability; would not be guaranteed. This paper focuses on the modelling and simulation of intelligent master controller for hybridized power pool deployment. This is achieved using state space mathematical model, MATLAB/Simulink and proteus software. The state space model provides the mathematical equation for the system stability, controllability and observability criteria from the system transfer function. The MATLAB/Simulink software provides response trends and the Proteus software provides the virtual implementation platform for concept validation with its code written in Arduino (IDE). The system was demonstrated through simulation and the virtual results showed that the system capability in fostering intelligent control commands in the hybridized power pool scenario. The system stability was determined using Root locus, Nyquist and Routh Hurwitz criteria. Subsequent research efforts are being made towards implementing the design optimizable on the hardware using the design specifications.
Abstract: Every conceptual framework requires several developmental stages such as prototyping, preproduction and production stages. This paper considers prototype developmental stage which entails design, modelling and simulation for the conceptual system to determine suitable parameters and specifications before the production task is initiation. The inabi...
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