Publications

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2008
Abungu NO, Konditi DB, Otieno AV. "Analysis of Waveguide-backed Apertures of Arbitrary Shape in a Thick Conducting Screen." World Scientific and Engineering Academy and Society (WSEAS). 2008. AbstractWebsite

Power utility companies are required to supply customers with power within specified voltage limits. Voltage rise in networks with distributed generators therefore poses a challenge. This paper presents a coordinated network controller whose objective is to maintain an optimal voltage profile across the power network. The operations of distributed generators, on-load tap-changing transformers and reactive power sources are controlled. The controller is modelled as an optimisation problem which is solved using Particle Swarm Optimisation. The IEEE 30-bus test network is then used to verify the effectiveness of the controller. The results obtained show that this controller can greatly improve the voltage profile of a power network by varying the parameters of existing generation and voltage control equipment.

2007
Abungu NO, Konditi DB, Otieno AV. "Analysis of Waveguide-backed Inhomogeneously-filled Apertures of Arbitrary Shape in a Thick Conducting Screen." World Scientific and Engineering Academy and Society (WSEAS). 2007. AbstractWebsite

Power utility companies are required to supply customers with power within specified voltage limits. Voltage rise in networks with distributed generators therefore poses a challenge. This paper presents a coordinated network controller whose objective is to maintain an optimal voltage profile across the power network. The operations of distributed generators, on-load tap-changing transformers and reactive power sources are controlled. The controller is modelled as an optimisation problem which is solved using Particle Swarm Optimisation. The IEEE 30-bus test network is then used to verify the effectiveness of the controller. The results obtained show that this controller can greatly improve the voltage profile of a power network by varying the parameters of existing generation and voltage control equipment.

2006
Abungu NO, Konditi DB, Otieno AV. "Analysis of Waveguide-backed Apertures of Arbitrary Shape in a Thick Conducting Screen.". In: 1st JKUAT Scientific, Technological and Industrialization Conference. The JKUAT Scientific, Technological and Industrialization Conference 2006; 2006. Abstract

Power utility companies are required to supply customers with power within specified voltage limits. Voltage rise in networks with distributed generators therefore poses a challenge. This paper presents a coordinated network controller whose objective is to maintain an optimal voltage profile across the power network. The operations of distributed generators, on-load tap-changing transformers and reactive power sources are controlled. The controller is modelled as an optimisation problem which is solved using Particle Swarm Optimisation. The IEEE 30-bus test network is then used to verify the effectiveness of the controller. The results obtained show that this controller can greatly improve the voltage profile of a power network by varying the parameters of existing generation and voltage control equipment.

2005
Abungu NO, Konditi DB, Otieno AV. "Analysis of Electromagnetic Transmission through dielectric filled Apertures of Arbitrary Shape in a Thick Conducting Screen." World Scientific and Engineering Academy and Society (WSEAS). 2005. AbstractWebsite

The paper deals with an extension of the previous work appearing in a past issue of this transaction by the authors on hybrid FEM/MOM technique for analyzing transmission properties of arbitrarily shaped apertures on a thick conducting screen. In the present work, the effect of placing different dielectric material slabs in the conducting screen cavity on the electromagnetic transmission parameters is first analyzed and, then, the effect of interchanging the positions of these dielectric slabs relative to the incident field. Validation results for rectangular and cross-shaped slots are presented. Close agreement between our data and published data is observed.  Further data has been generated for rectangular, circular, diamond-shaped and cross-shaped apertures.

1994
Ijumba N, Gakuru M, Abungu NO. "Applications of electric field calculations in optimization of insulator design.". In: The 4th IEEE International Conference on Properties and Applications of Dielectric Material. The IEEE International Conference on Properties and Applications of Dielectric Materials; 1994. Abstract

When an insulator is placed in an electrode gap, its surface charge field distorts the geometric field, leading to a flashover at a voltage value dependent on the degree of the gap field distortion. This paper reports on studies conducted to determine the relationship between flashover voltages and electric filed distribution along solid insulator surfaces. The surface electric field distribution along different insulator profiles was determined using the Finite-Difference method, and the flashover of the actual profile model measured. The obtained results show that each profile had a peak surface electric field and the higher the peak value, the lower the flashover voltage. The correlation curve for peak electric field and flashover voltage was developed using a curve fitting technique based on the Nelder-Mead simplex algorithm.

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