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Improving Voltage Stability in Nigerian 330kv Transmission Network Using Intelligent Solid State Var Compensator (SSVC)
Ngang Bassey Ngang,
Bakare Kazeem
Issue:
Volume 9, Issue 3, June 2021
Pages:
60-68
Received:
3 May 2021
Accepted:
25 May 2021
Published:
31 May 2021
Abstract: The low performance of power supply in the transmission network is as a result of voltage instability, this is overcome by improving voltage stability in Nigerian 330kv transmission network using intelligent solid state var compensator (SSVC). It is achieved in this procedure by running the load flow from the characterized data thereby locating the faulty buses that their per unit volts do not fall within the ranges of 0.95 through 1.05, designing a conventional model for voltage stability in Nigerian 330KV transmission network, designing SIMULINK model for SSVC, designing a rule base that will enhance the faulty buses to attain voltage stability. Integrating the designed SIMULINK model for SSVC to designed rule base and designing a SIMULINK model for improving voltage stability in Nigerian 330KV transmission network using intelligent solid state var compensator. The results obtained were as follows: In bus1 the conventional per unit volts is 0.92P.U.volts which did not reach the range of voltage stability of 0.95 through 1.05 P.U.volts. On the other hand, when intelligent solid state var compensator (ssvc) is incorporated in the system the per unit volts becomes 0.9779P.U.volts thereby attaining voltage stability that enhances power supply. In bus 9 the conventional per unit volts is 0.922P.U.volts which did not attain the voltage stability range of 0.95 through 1.05 P.U.volts. On the other hand, when intelligent solid state var compensator (ssvc) is incorporated in the system the per unit volts becomes 0.9801P.U.volts thereby attaining voltage stability that enhances power supply.
Abstract: The low performance of power supply in the transmission network is as a result of voltage instability, this is overcome by improving voltage stability in Nigerian 330kv transmission network using intelligent solid state var compensator (SSVC). It is achieved in this procedure by running the load flow from the characterized data thereby locating the...
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Design and Testing of Building Integrated Hybrid Vertical Axis Wind Turbine
Gwani Mohammed,
Abubakar Ibrahim,
Umar Mohammed Kangiwa,
Joshua Benjamin Wisdom
Issue:
Volume 9, Issue 3, June 2021
Pages:
69-77
Received:
26 January 2021
Accepted:
20 April 2021
Published:
3 June 2021
Abstract: Building integrated wind turbine are considered as part of a group of technologies that are suitable for domestic micro-energy generation. Darrieus and Savonius turbines work efficiently in the urban environment at low wind speed, the Savonius rotor is self-starting and creates high torque but has low efficiency, while the Darrieus rotor is very efficient but does not self-start easily. Thus, the combination of these rotors as hybrid system would help to improve the overall efficiency of the wind turbines. The aim of this paper was to design, fabricate and experimentally investigate the performance of hybrid Vertical Axis Wind Turbine (VAWT) on residential buildings. A building model with gable rooftop was design and fabricated for use in testing of the hybrid VAWT. The height of the hybrid VAWT was paced at Y = 150 mm above the rooftop. The results obtained from the studies showed that the hybrid VAWT mounted on the building rooftop yield up to 63% more energy compared to the bare-hybrid VAWT (without building). Similar improvement in performance of the hybrid VAWT is also observed in the rotational speed, mechanical power and the coefficient of torque, where the building integrated hybrid VAWT outperformed the bare-hybrid VAWT. Thus the results indicate that urban buildings are suitable for the mounting of the hybrid VAWT.
Abstract: Building integrated wind turbine are considered as part of a group of technologies that are suitable for domestic micro-energy generation. Darrieus and Savonius turbines work efficiently in the urban environment at low wind speed, the Savonius rotor is self-starting and creates high torque but has low efficiency, while the Darrieus rotor is very ef...
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Analysis of Losses in Cables and Transformers with Unbalanced Load and Current Harmonics
Issue:
Volume 9, Issue 3, June 2021
Pages:
78-86
Received:
17 April 2021
Published:
4 June 2021
Abstract: The power quality problems are more and more serious in the power system. The harmonics and the three-phase imbalance have a greater impact on the line loss of power grid. We focus on the power losses in cables and transformers with unbalanced load in current harmonics basing on the equivalent resistance method. The impact caused by the skin effect is illustrated in order to enhance the accuracy of the theoretical calculation. For this purpose, a mathematical development that takes in account the presence of current harmonic components and unbalanced load in the losses calculation is presented. The reliability of the method is verified in a simulation model. According to the comparative analysis between the simulation and the proposed method, we can conclude that the harmonic resistance calculation method considering skin effect is more accurate than the traditional method. The results show that the additional loss caused by the harmonics has a nonlinear relation with the harmonic currents. At the same time, the additional loss of distribution network under compound disturbance with unbalanced load in current harmonics is studied. Compared with the cases that two phase load are heavy and one phase load is light or one phase load is heavy and other two phase load are light, when one phase load is heavy, one phase load is light and one phase load is the average value of the others, the additional loss of the system is the least one. The additional loss for the case with that two phase load are heavy and one phase load is light is the biggest one.
Abstract: The power quality problems are more and more serious in the power system. The harmonics and the three-phase imbalance have a greater impact on the line loss of power grid. We focus on the power losses in cables and transformers with unbalanced load in current harmonics basing on the equivalent resistance method. The impact caused by the skin effect...
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Review of Reconfigurable Virtual Instrumentation and It Implementation in Cameroon Labs
Gisele Beatrice Sonfack,
Pabame Frederic
Issue:
Volume 9, Issue 3, June 2021
Pages:
87-92
Received:
12 May 2021
Accepted:
1 June 2021
Published:
16 June 2021
Abstract: With the exponential evolution of the complexity of reconfigurable logic circuits, the Field Programmable Gate Array (FPGA) becomes an attractive element to realize reconfigurable virtual instruments, due to their inherent flexibility. The simple bus architecture allows us to use pre-exist IP Cores (IP Cores) in VHDL and interconnecting them, also allowed us to reuse code in all designs. Research on reconfigurable virtual instruments has continued to evolve and has become a real alternative for many research laboratories in developing countries such as Cameroon. In this paper, we present a review of the FPGA-Based Reconfigurable Virtual instrumentation and the experimental tools developed in our labs. The development of experimental sciences and engineering benefits from the ability to obtain reliable data from controlled situations and process as measurements and comparisons. This achievement invokes two parallel approaches: software development and hardware development. This has been demonstrated in our context with the implementation of a virtual oscilloscope. Indeed, with the processing of reconfigurable technological circuit, designing virtual instruments with multiple shapes is henceforth feasible. The advantages offered by this innovation are essentially the reduction of development times, the optimization of resources and the reduction of costs. Given the need for these instruments in research laboratories, their lack in universities in our countries poses a real problem. Fortunately, in recent years, research and technological innovation have largely developed to offer reconfigurable solutions in instrumentation based on SoCs. The oscilloscope described in this article can communicate directly with a PC, using a USB serial port that allows communication between the instruments and the PC.
Abstract: With the exponential evolution of the complexity of reconfigurable logic circuits, the Field Programmable Gate Array (FPGA) becomes an attractive element to realize reconfigurable virtual instruments, due to their inherent flexibility. The simple bus architecture allows us to use pre-exist IP Cores (IP Cores) in VHDL and interconnecting them, also ...
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