by Felix Kalunta and Obiageli Ngwu
Original Research
Increasing electricity demand occasioned by increased population and advancement in economic activities makes it mandatory to upgrade the Nigerian power grid. The ongoing construction of a new hydropower plant at Mambila Plateau in Taraba State of Nigerian is a response to this call. Performance evaluation of the Nigerian power grid expanded to include the new power plant has revealed the occurrence of poor voltage profile accompanied by colossal power losses mostly in the Bauchi region. This paper explores the techniques for addressing this challenge by the integration of voltage source controlled high voltage direct current (VSC-HVDC) transmission system into the expanded Nigerian 41- bus 330kV transmission grid network at the weakest areas. The HVDC converter is introduced into the power grid as an extra bus, and all impedance elements in the HVDC system transformed to the grid side. This action merges the two converter stations into a single bus to produce an entirely high voltage alternating current (HVAC) system, thereby making it possible to apply conventional power flow techniques. This model was verified by the simulation of the modified network in Matlab Simulink environment. Performance evaluation of the expanded network prior to the connection of HVDC system identified the transmission line between the Jalingo bus and the Mambila power plant as the weakest area, which was consequently selected as the optimal location for the proposed VSC-HVDC system. Power flow analysis of the modified network with the inclusion of HVDC system revealed a remarkable improvement in voltage magnitude at the weak buses, and minimized power losses in the system. This implies that such a project is worth undertaking. Therefore, the enhancement of voltage profile using the VSC-HVDC transmission system is a panacea for curbing the expected line losses that may arise while evacuating power from the proposed Mambila plant.
American Journal of Electrical and Electronic Engineering. 2021, 9(1), 12-20. DOI: 10.12691/ajeee-9-1-3
Pub. Date: November 23, 2021
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by Yu Xia, Xinyuan Zhang, Haoran Ge, Shaofei Hao and Wenjing Zou
Original Research
The comprehensive utilization of distributed power sources can effectively reduce the consumption of fossil energy and reduce carbon emissions. Based on the situational awareness technology, this paper proposes a distributed power optimization dispatching technology, with the least carbon emission as the optimization goal and meeting the grid load demand as the constraint condition. First, in the situation awareness stage, collect information such as the operation status of the power grid; second, use the data collected by situation awareness to simulate the operation of the power grid in the situation understanding stage to achieve in-depth perception of the power grid; finally, consider the grid operating load in the situation guidance stage Demand adjustment and optimization strategy to realize flexible dispatch and control of the power grid in a favorable direction. This paper takes the IEEE 30-bus system as an example for simulation analysis, and the simulation results verify the effectiveness of the proposed method.
American Journal of Electrical and Electronic Engineering. 2021, 9(1), 7-11. DOI: 10.12691/ajeee-9-1-2
Pub. Date: September 02, 2021
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by Nassrin Ibrahim Mohamed Elamin
Original Research
The use of transparent antennas has been gaining popularity in recent years. Today many types and designs of display apparatus can be seen along city streets and for buildings as a backup power supply. Transparent antennas can be used for cladding the modern glass buildings. Transparent antennas also can be placed directly on top of solar cells and resolve the issue of competing for limited surface real estate. Like integration with the solar panels of small satellites, where limited surface area is an issue for mounting antennas, solar cells, and space instruments. This paper discuss the methods and materials used to design a transparent antennas that can be integrated with solar cells to solve the issue of competing for limited surface real estate and backup the short of electricity in the sunny country Sudan. In this paper a proposed a 4-element meander line MIMO Multiple Inputs Multiple Outputs antenna system designed from Aluminum foil radiator over transparent glass substrate this design is transparent partially. Despite of the unfamiliar materials used for the antenna design and it is a limited size MIMO system the simulated and measured results showed XBand matched bandwidth. In this work the antenna is designed and the solar cell module has been proposed theoretically.
American Journal of Electrical and Electronic Engineering. 2021, 9(1), 1-6. DOI: 10.12691/ajeee-9-1-1
Pub. Date: March 03, 2021
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