A. Ayokunle - Academia.edu (original) (raw)
Papers by A. Ayokunle
The numerous power system blackouts in the past decade and in recent times attest to the fact tha... more The numerous power system blackouts in the past decade and in recent times attest to the fact that more work still needs to be done to tackle the problem of voltage instability and the resultant voltage collapse. This research work proposes a new line stability index that is suitable for the prediction of voltage collapse in Power System Networks (PSNs). This index code-named the New Line Stability Index-1 (NLSI_1) was obtained by deriving from first principles equivalent expressions for the Line Stability Index (Lmn) and the Fast Voltage Stability Index (FVSI) and combining them through a switching logic based on the voltage angle difference since it can signal the imminence of voltage collapse. This new index (NLSI_1) was tested on the IEEE 14-bus system and it gives the same results as the other indices (Lmn and FVSI). For the base case, the IEEE 14-bus test system was found to be stable with all the three indices having approximately equal values (< 1) for all the lines. The ...
International Journal of Renewable Energy Research, 2013
A potential solution to adequate and sustainable electricity supply problems in most developing c... more A potential solution to adequate and sustainable electricity supply problems in most developing countries is dependent on proper harnessing of solar (radiant) energy. Owing to the over dependence on fossil-fuel based energy, there is an exponential rise in carbon dioxide (CO2) emissions into the atmosphere, thereby causing severe environmental degradation and ozone layer depletion. This paper seeks to apply the readily available radiant energy source to solar water heating, and establish possible economic benefits to its use in domestic applications for residents of Covenant University campus. The microcontroller-based active solar water heating system (ASWHS) is designed to effectively absorb radiant energy using solar collectors, and store it as hot water in a water tank via a direct current (DC) circulation pump powered by a stand-alone photovoltaic (PV) system. The design also incorporates an auxiliary electric heater which is put to use only when there is insufficient radiant e...
British Journal of Computer, Networking and Information Technology, 2021
Voting is a critical element of any election which involves the processes of electing leaders or ... more Voting is a critical element of any election which involves the processes of electing leaders or representatives into positions of authority in a democratic system of government. In most developing countries of the world, this process is usually marred with challenges of confidentiality, integrity, availability and auditability such as falsification of results, identity theft, theft of ballot boxes, multiple voting problems, over voting, and electoral fraud. This paper presents a framework for Automated Teller Machine-based voting system that solves the aforementioned challenges of the current voting system by using the existing Automated Teller Machines and debit cards issued for voting. Going further to implement the solution proposed in this paper will enhance and guarantee the credibility of the electoral processes and show a true reflection of the wishes of the people.
A potential solution to adequate and sustainable electricity supply problems in most ... more A potential solution to adequate and sustainable electricity supply problems in most developing countries is
dependent on proper harnessing of solar (radiant) energy. Owing to the over dependence o n fossil-fuel based energy, there is
an exponential rise in carbon dioxide (CO
2
) emissions into the atmosphere, thereby causing severe environmental degradation
and ozone layer depletion. This paper seeks to apply the readily available radiant energy source to solar water heating, and
establish possible economic benefits to its use in domestic applications for residents of Covenant University campus. The
microcontroller-based active solar water heating system (ASWHS) is designed to effectively absorb radiant energy using solar
collectors, and store it as hot water in a water tank via a direct current (DC) circulation pump powered by a stand-alone
photovoltaic (PV) system. The design also incorporates an auxiliary electric heater which is put to use only when there is
insufficient radiant energy. A case study is reported to show the importance of the ASWHS for domestic water heating. The
maximum design efficiency and the expected energy output of the solar collector throughout its working life is 79.94% and
498,225kWh respectively. A reduced dependence on grid supply and/or fossil-fuel based generator sets during hot water
demand periods is recorded using the ASWHS with a high payback period of 15 years; and a lower unit cost (US$0.01/kWh)
of the ASWHS makes it more economically viable as compared to the unit cost (US$0.18/kWh) of the grid supply for the same
amount of energy consumed.
Keywords- ASWHS, CO2 emissions, microcontroller, solar energy, solar collector, unit cost.
The numerous power system blackouts in the past decade and in recent times attest to the fact tha... more The numerous power system blackouts in the past decade and in recent times attest to the fact that more work still needs to be done to tackle the problem of voltage instability and the resultant voltage collapse. This research work proposes a new line stability index that is suitable for the prediction of voltage collapse in Power System Networks (PSNs). This index code-named the New Line Stability Index-1 (NLSI_1) was obtained by deriving from first principles equivalent expressions for the Line Stability Index (Lmn) and the Fast Voltage Stability Index (FVSI) and combining them through a switching logic based on the voltage angle difference since it can signal the imminence of voltage collapse. This new index (NLSI_1) was tested on the IEEE 14-bus system and it gives the same results as the other indices (Lmn and FVSI). For the base case, the IEEE 14-bus test system was found to be stable with all the three indices having approximately equal values (< 1) for all the lines. The contingency case reveals that bus 14 ranks as the weakest bus in the system with the smallest maximum permissible reactive load of 74.6 Mvar and the critical line with respect to bus 14, is the line connecting bus 13 to bus 14. The values of the three indices, Lmn, FVSI and NSLI_1, are approximately equal thereby further validating the accuracy of the new line stability index-1 (NLSI_1).
The numerous power system blackouts in the past decade and in recent times attest to the fact tha... more The numerous power system blackouts in the past decade and in recent times attest to the fact that more work still needs to be done to tackle the problem of voltage instability and the resultant voltage collapse. This research work proposes a new line stability index that is suitable for the prediction of voltage collapse in Power System Networks (PSNs). This index code-named the New Line Stability Index-1 (NLSI_1) was obtained by deriving from first principles equivalent expressions for the Line Stability Index (Lmn) and the Fast Voltage Stability Index (FVSI) and combining them through a switching logic based on the voltage angle difference since it can signal the imminence of voltage collapse. This new index (NLSI_1) was tested on the IEEE 14-bus system and it gives the same results as the other indices (Lmn and FVSI). For the base case, the IEEE 14-bus test system was found to be stable with all the three indices having approximately equal values (< 1) for all the lines. The ...
International Journal of Renewable Energy Research, 2013
A potential solution to adequate and sustainable electricity supply problems in most developing c... more A potential solution to adequate and sustainable electricity supply problems in most developing countries is dependent on proper harnessing of solar (radiant) energy. Owing to the over dependence on fossil-fuel based energy, there is an exponential rise in carbon dioxide (CO2) emissions into the atmosphere, thereby causing severe environmental degradation and ozone layer depletion. This paper seeks to apply the readily available radiant energy source to solar water heating, and establish possible economic benefits to its use in domestic applications for residents of Covenant University campus. The microcontroller-based active solar water heating system (ASWHS) is designed to effectively absorb radiant energy using solar collectors, and store it as hot water in a water tank via a direct current (DC) circulation pump powered by a stand-alone photovoltaic (PV) system. The design also incorporates an auxiliary electric heater which is put to use only when there is insufficient radiant e...
British Journal of Computer, Networking and Information Technology, 2021
Voting is a critical element of any election which involves the processes of electing leaders or ... more Voting is a critical element of any election which involves the processes of electing leaders or representatives into positions of authority in a democratic system of government. In most developing countries of the world, this process is usually marred with challenges of confidentiality, integrity, availability and auditability such as falsification of results, identity theft, theft of ballot boxes, multiple voting problems, over voting, and electoral fraud. This paper presents a framework for Automated Teller Machine-based voting system that solves the aforementioned challenges of the current voting system by using the existing Automated Teller Machines and debit cards issued for voting. Going further to implement the solution proposed in this paper will enhance and guarantee the credibility of the electoral processes and show a true reflection of the wishes of the people.
A potential solution to adequate and sustainable electricity supply problems in most ... more A potential solution to adequate and sustainable electricity supply problems in most developing countries is
dependent on proper harnessing of solar (radiant) energy. Owing to the over dependence o n fossil-fuel based energy, there is
an exponential rise in carbon dioxide (CO
2
) emissions into the atmosphere, thereby causing severe environmental degradation
and ozone layer depletion. This paper seeks to apply the readily available radiant energy source to solar water heating, and
establish possible economic benefits to its use in domestic applications for residents of Covenant University campus. The
microcontroller-based active solar water heating system (ASWHS) is designed to effectively absorb radiant energy using solar
collectors, and store it as hot water in a water tank via a direct current (DC) circulation pump powered by a stand-alone
photovoltaic (PV) system. The design also incorporates an auxiliary electric heater which is put to use only when there is
insufficient radiant energy. A case study is reported to show the importance of the ASWHS for domestic water heating. The
maximum design efficiency and the expected energy output of the solar collector throughout its working life is 79.94% and
498,225kWh respectively. A reduced dependence on grid supply and/or fossil-fuel based generator sets during hot water
demand periods is recorded using the ASWHS with a high payback period of 15 years; and a lower unit cost (US$0.01/kWh)
of the ASWHS makes it more economically viable as compared to the unit cost (US$0.18/kWh) of the grid supply for the same
amount of energy consumed.
Keywords- ASWHS, CO2 emissions, microcontroller, solar energy, solar collector, unit cost.
The numerous power system blackouts in the past decade and in recent times attest to the fact tha... more The numerous power system blackouts in the past decade and in recent times attest to the fact that more work still needs to be done to tackle the problem of voltage instability and the resultant voltage collapse. This research work proposes a new line stability index that is suitable for the prediction of voltage collapse in Power System Networks (PSNs). This index code-named the New Line Stability Index-1 (NLSI_1) was obtained by deriving from first principles equivalent expressions for the Line Stability Index (Lmn) and the Fast Voltage Stability Index (FVSI) and combining them through a switching logic based on the voltage angle difference since it can signal the imminence of voltage collapse. This new index (NLSI_1) was tested on the IEEE 14-bus system and it gives the same results as the other indices (Lmn and FVSI). For the base case, the IEEE 14-bus test system was found to be stable with all the three indices having approximately equal values (< 1) for all the lines. The contingency case reveals that bus 14 ranks as the weakest bus in the system with the smallest maximum permissible reactive load of 74.6 Mvar and the critical line with respect to bus 14, is the line connecting bus 13 to bus 14. The values of the three indices, Lmn, FVSI and NSLI_1, are approximately equal thereby further validating the accuracy of the new line stability index-1 (NLSI_1).