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Papers by Peter Obongha Ohiero
Journal of Power and Energy Engineering, 2022
Electricity network is a very complex entity that comprises several components like generators, t... more Electricity network is a very complex entity that comprises several components like generators, transmission lines, loads among others. As technologies continue to evolve, the complexity of the electricity network has also increased as more devices are being connected to the network. To understand the physical laws governing the operation of the network, techniques such as optimal power flow (OPF), Economic dispatch (ED) and Security constrained optimal power flow (SCOPF) were developed. These techniques have been used extensively in network operation, planning and so on. However, an in-depth presentation showcasing the merits and demerits of these techniques is still lacking in the literature. Hence, this paper intends to fill this gap. In this paper, Economic dispatch, optimal power flow and security-constrained optimal power flow are applied to a 3-bus test system using a linear programming approach. The results of the ED, OPF and SC-OPF are compared and presented.
International journal of engineering research and technology, 2016
This paper presents an alternative modelling method for a full scale back-back voltage source inv... more This paper presents an alternative modelling method for a full scale back-back voltage source inverter that results in a significant reduction in simulation run time of pulse width modulation voltage source inverters. The proposed modelling method is analytically developed based on control strategy and switching function of voltage source inverter to estimate the ‘average’ voltage in each switching period across each phase of the voltage source inverter. The average voltage is then used as piecewise linear voltage sources for each phase of alternating current load or electrical machine connected to the voltage source inverter. The developed model was applied to simulation of full scale voltage source inverter with variable speed permanent magnet synchronous generator wind energy conversion systems. A simplified control technique is developed to track maximum power points at the generator side and maintained constant DC voltage at the AC load/grid side using sinusoidal PI current con...
International Journal of Innovative Research and Development, 2018
Introduction Recent economic and fuel crisis in Nigeria opened a wider opportunity for renewable ... more Introduction Recent economic and fuel crisis in Nigeria opened a wider opportunity for renewable energy resources. The federal government of Nigeria has proposed to generate 30GW of installed on-grid electricity by the year 2030 of which 30% of total energy capacity will be obtain from renewable energy resources ((NREAP, 2016). Among the renewable energy sources, solar energy has the largest source and greater potential to meet this target. The solar energy is from the sun, it is a natural, free and environmentally friendly source of energy and can be harnessed using appropriate technology to generate electricity and use for other applications. However, the availability of solar radiation depends on the geographical location and latitude on the surface of the earth. Nigeria lies in the high solar radiation belt with an average solar irradiation of 2011kWh/m2 per year with the northern part having greater potentials with a horizontal irradiation of 7kWh/m2 per day suitable for large-scale solar photo voltaic (PV) electricity or solar thermal electricity project. The southern part also has a horizontal solar irradiation of 4kWh/m2 per day suitable for on-grid and off-grid small scale solar project for residential, social, commercial and cottage industrial use. In order to achieve this there is need for aggressive deployment of solar PV electricity across the country. However, not every location on the earth's surface has the required solar radiation to generate electric energy. Therefore, knowing the solar radiation data at a particular location is important in knowing the amount of electric energy that can be harnessed, the design and development of the type of solar energy conversion technologies that can be deployed. Solar radiation is measured hourly at weather stations using equipment such as Pyrheliometer and pyranometer and this help us to know the daily, weekly, monthly, annual solar radiation, and average solar radiation on the horizontal earth surface. This equipment measures both the direct and diffused components of solar radiation and give their sum which is the global solar radiation. These parameters are measured over time and the average values calculated. In developing countries
This research project investigates the development and validation of alternative simulation model... more This research project investigates the development and validation of alternative simulation models for voltage source inverter fed permanent magnet synchronous machine drive systems which can rapidly and accurately analyse and evaluate the performance of PM machine drives and associated control system designs. Traditionally simulations have been conducted using switching models and state space average value methods. The simulation of switching models is time consuming and that of state space averaging involves complex mathematical transformation to d-q axis, with additional circuitry and this limits their application in a time critical design process. Even if the complex calculations of state space are overcome, the proposed model can still achieve better results. This thesis presents the development of fast multi system simulation models for permanent magnet synchronous motor and generator drive systems. The fast simulation model: Average Voltage Estimation Model (AVEM) was develop...
Journal of Power and Energy Engineering
Electricity network is a very complex entity that comprises several components like generators, t... more Electricity network is a very complex entity that comprises several components like generators, transmission lines, loads among others. As technologies continue to evolve, the complexity of the electricity network has also increased as more devices are being connected to the network. To understand the physical laws governing the operation of the network, techniques such as optimal power flow (OPF), Economic dispatch (ED) and Security constrained optimal power flow (SCOPF) were developed. These techniques have been used extensively in network operation, planning and so on. However, an in-depth presentation showcasing the merits and demerits of these techniques is still lacking in the literature. Hence, this paper intends to fill this gap. In this paper, Economic dispatch, optimal power flow and security-constrained optimal power flow are applied to a 3-bus test system using a linear programming approach. The results of the ED, OPF and SC-OPF are compared and presented.
Journal of Power and Energy Engineering, 2022
Electricity network is a very complex entity that comprises several components like generators, t... more Electricity network is a very complex entity that comprises several components like generators, transmission lines, loads among others. As technologies continue to evolve, the complexity of the electricity network has also increased as more devices are being connected to the network. To understand the physical laws governing the operation of the network, techniques such as optimal power flow (OPF), Economic dispatch (ED) and Security constrained optimal power flow (SCOPF) were developed. These techniques have been used extensively in network operation, planning and so on. However, an in-depth presentation showcasing the merits and demerits of these techniques is still lacking in the literature. Hence, this paper intends to fill this gap. In this paper, Economic dispatch, optimal power flow and security-constrained optimal power flow are applied to a 3-bus test system using a linear programming approach. The results of the ED, OPF and SC-OPF are compared and presented.
International journal of engineering research and technology, 2016
This paper presents an alternative modelling method for a full scale back-back voltage source inv... more This paper presents an alternative modelling method for a full scale back-back voltage source inverter that results in a significant reduction in simulation run time of pulse width modulation voltage source inverters. The proposed modelling method is analytically developed based on control strategy and switching function of voltage source inverter to estimate the ‘average’ voltage in each switching period across each phase of the voltage source inverter. The average voltage is then used as piecewise linear voltage sources for each phase of alternating current load or electrical machine connected to the voltage source inverter. The developed model was applied to simulation of full scale voltage source inverter with variable speed permanent magnet synchronous generator wind energy conversion systems. A simplified control technique is developed to track maximum power points at the generator side and maintained constant DC voltage at the AC load/grid side using sinusoidal PI current con...
International Journal of Innovative Research and Development, 2018
Introduction Recent economic and fuel crisis in Nigeria opened a wider opportunity for renewable ... more Introduction Recent economic and fuel crisis in Nigeria opened a wider opportunity for renewable energy resources. The federal government of Nigeria has proposed to generate 30GW of installed on-grid electricity by the year 2030 of which 30% of total energy capacity will be obtain from renewable energy resources ((NREAP, 2016). Among the renewable energy sources, solar energy has the largest source and greater potential to meet this target. The solar energy is from the sun, it is a natural, free and environmentally friendly source of energy and can be harnessed using appropriate technology to generate electricity and use for other applications. However, the availability of solar radiation depends on the geographical location and latitude on the surface of the earth. Nigeria lies in the high solar radiation belt with an average solar irradiation of 2011kWh/m2 per year with the northern part having greater potentials with a horizontal irradiation of 7kWh/m2 per day suitable for large-scale solar photo voltaic (PV) electricity or solar thermal electricity project. The southern part also has a horizontal solar irradiation of 4kWh/m2 per day suitable for on-grid and off-grid small scale solar project for residential, social, commercial and cottage industrial use. In order to achieve this there is need for aggressive deployment of solar PV electricity across the country. However, not every location on the earth's surface has the required solar radiation to generate electric energy. Therefore, knowing the solar radiation data at a particular location is important in knowing the amount of electric energy that can be harnessed, the design and development of the type of solar energy conversion technologies that can be deployed. Solar radiation is measured hourly at weather stations using equipment such as Pyrheliometer and pyranometer and this help us to know the daily, weekly, monthly, annual solar radiation, and average solar radiation on the horizontal earth surface. This equipment measures both the direct and diffused components of solar radiation and give their sum which is the global solar radiation. These parameters are measured over time and the average values calculated. In developing countries
This research project investigates the development and validation of alternative simulation model... more This research project investigates the development and validation of alternative simulation models for voltage source inverter fed permanent magnet synchronous machine drive systems which can rapidly and accurately analyse and evaluate the performance of PM machine drives and associated control system designs. Traditionally simulations have been conducted using switching models and state space average value methods. The simulation of switching models is time consuming and that of state space averaging involves complex mathematical transformation to d-q axis, with additional circuitry and this limits their application in a time critical design process. Even if the complex calculations of state space are overcome, the proposed model can still achieve better results. This thesis presents the development of fast multi system simulation models for permanent magnet synchronous motor and generator drive systems. The fast simulation model: Average Voltage Estimation Model (AVEM) was develop...
Journal of Power and Energy Engineering
Electricity network is a very complex entity that comprises several components like generators, t... more Electricity network is a very complex entity that comprises several components like generators, transmission lines, loads among others. As technologies continue to evolve, the complexity of the electricity network has also increased as more devices are being connected to the network. To understand the physical laws governing the operation of the network, techniques such as optimal power flow (OPF), Economic dispatch (ED) and Security constrained optimal power flow (SCOPF) were developed. These techniques have been used extensively in network operation, planning and so on. However, an in-depth presentation showcasing the merits and demerits of these techniques is still lacking in the literature. Hence, this paper intends to fill this gap. In this paper, Economic dispatch, optimal power flow and security-constrained optimal power flow are applied to a 3-bus test system using a linear programming approach. The results of the ED, OPF and SC-OPF are compared and presented.