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Critical Clearing Time Evaluation of Nigerian 330kV Transmission System
Adepoju Gafari Abiola,
Tijani Muhammed Adekilekun
Issue:
Volume 2, Issue 6, November 2013
Pages:
123-128
Received:
30 July 2013
Published:
20 October 2013
Abstract: Critical Clearing Time (CCT) is the largest possible time for which a power system is allowed to remain in fault condition without losing stability. Appropriate CCTs settings of protective equipments on power system greatly determine the reliability of power supply. This paper determines the CCTs for all the transmission lines in the Nigerian 24-bus, 39-lines 330kV transmission system. The Transient Stability Analysis (TSA) program adopted used the method of partitioned approach with explicit integration method. The result of TSA was considered satisfactory since about 87% of the values obtained fall within acceptable international range. It was concluded that the determination of appropriate CCTs for the Nigerian power system will enhance the operation of the power system by limiting effects of faults on the power system.
Abstract: Critical Clearing Time (CCT) is the largest possible time for which a power system is allowed to remain in fault condition without losing stability. Appropriate CCTs settings of protective equipments on power system greatly determine the reliability of power supply. This paper determines the CCTs for all the transmission lines in the Nigerian 24-bu...
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Time-Dependent Exergy Analysis of a 120 MW Steam Turbine Unit of Sapele Power Plant
Obodeh,
O.,
Ugwuoke,
P. E.
Issue:
Volume 2, Issue 6, November 2013
Pages:
129-136
Received:
9 October 2013
Published:
10 November 2013
Abstract: Time-dependent exergy model was used to assess the exergy losses that occurred in the major components of a 120 MW steam turbine unit of Sapele power station. Data used for the analysis were both base parameters and measured values recorded in the station operational logbook for the period of January 2007 to December 2011. Component’s exergy destruction increments as compared with its base value were highlighted and possible causes of the increment were identified. The boiler section had the highest value. The economiser had a maximumof 4.26 % in 2009 and minimum of 1.25 % in 2007. While the evaporator had a maximium of 5.02 % in 2009 and minimum of 1.50 % in 2008. The superheater had maximum of 4.64 % in 2011 and minimum of 1.48 % in 2007. For the reheater, the maximum was 3.57 % in 2011 while the minimum was 1.71 % in 2007. Tube fouling, defective burners, steam traps and air heater fouling were adduced for the increment. Upgrading components with better designs, optimizing system performance and elimination of conditions that degrade efficiency between maintenance outages were suggested for improving the performance of the boiler section. The analysis showed that for the three turbine stages, HP turbine had the highest increment while the LP turbine had the lowest. The loss in the three turbine stages were attributed to throttling losses at the governor valves and silica deposits at the nozzles and blades. Retrofitting of rotors, diaphragms or complete stator/ rotor modules (inner block) were suggested for improving the situation. The results generally showed that exergy loss increased with increased operation time. It was observed that deterioration and obsolescence may be the major problems and that plant rehabilitation is a feasible solution. It was noted that the suggested modification and refurbishment of Sapele power plant units is an attractive solution to improve the plant economy and keep production cost competitive in a restructured Nigerian power system.
Abstract: Time-dependent exergy model was used to assess the exergy losses that occurred in the major components of a 120 MW steam turbine unit of Sapele power station. Data used for the analysis were both base parameters and measured values recorded in the station operational logbook for the period of January 2007 to December 2011. Component’s exergy destru...
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Conceptual Framework of a Solar PV Based High Voltage Battery Charging Strategyfor PHEVs and Evs
Issue:
Volume 2, Issue 6, November 2013
Pages:
137-143
Received:
25 September 2013
Published:
20 November 2013
Abstract: With the emergence of plugin hybrid electric vehicles (PHEVs) and electric vehicles (EVs) in the automotive market, the rate of the demand for electric power supply may be higher than the projected level. Distributed power generation is a feasible solution to balance the demand and supply of the power industry. In this work, a conceptual model of a solar photovoltaic (PV) based distributed generation system is proposed for charging the PHEVs and EVs. Outline of the overall system is developed with details of the background and feasibility analysis through hardware in the loop experiment of the proposed strategy.
Abstract: With the emergence of plugin hybrid electric vehicles (PHEVs) and electric vehicles (EVs) in the automotive market, the rate of the demand for electric power supply may be higher than the projected level. Distributed power generation is a feasible solution to balance the demand and supply of the power industry. In this work, a conceptual model of ...
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Disruptions and Malfunction Control in ORC using Spiral Predictive Model
Fareed ud Din,
Abdul Rehman Raza,
Muhammad Azam
Issue:
Volume 2, Issue 6, November 2013
Pages:
144-148
Received:
3 November 2013
Published:
20 November 2013
Abstract: This paper provides a critical and analytical assay in the process vicinity of an Organic Rankine Cycle (ORC) resulting in a representation of a controlling model named as Spiral Model as the best approach to implement for an efficient Plant Management (PM) and Risk Mitigation Planning (RMP), focusing on the robust and elegant energy production. There have been so many predictive and sensing process models presented for a gist and substantial control of the ORC plant in recent years but the proposed Spiral Predictive Model (SPM), eliminating all the limitation of all previously implemented models, provides the robustness by performing all the roles in increments; e.g. in the changing controllers, complex time-frequency characteristics, fault detectors for turbines against disruptions and the multi-switching techniques needs to be cascaded ahead of time with predictive and detective techniques. The proposed model optimizes the performance of ORC by response tracking and recursive correction which relegates the errors and sudden disturbance in the process flow. Fast response and recursive correction nicely handles Demand Response (DR) and parameters variations at different working modules which ultimately provide the dynamic performance capability. This study will be elaborating efficient model design and implementation to conjure up a well-designed working flow in an ORC plant.
Abstract: This paper provides a critical and analytical assay in the process vicinity of an Organic Rankine Cycle (ORC) resulting in a representation of a controlling model named as Spiral Model as the best approach to implement for an efficient Plant Management (PM) and Risk Mitigation Planning (RMP), focusing on the robust and elegant energy production. Th...
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Fault Detection and Classification Based on DWT and Modern Approaches for T.L Compensated with FACTS
Noha Mahmoud Bastawy,
Hossam El-din Talaat,
Amr Mohamed Ibrahim
Issue:
Volume 2, Issue 6, November 2013
Pages:
149-155
Received:
29 October 2013
Published:
20 November 2013
Abstract: A new approach for detecting and classifying a fault for transmission line compensated with Flexible AC Transmission System (FACTS) is presented in this paper. Unified Power Flow Controller (UPFC) is one of the most advanced FACTS devices that can simultaneously and independently control both the real and reactive power flow in a transmission line. The proposed technique consists of preprocessing module based on Discrete Wavelet Transform (DWT) in combination with Artificial Neural Network (ANN) or Gaussian Process (GP) for detecting and classifying fault events.
Abstract: A new approach for detecting and classifying a fault for transmission line compensated with Flexible AC Transmission System (FACTS) is presented in this paper. Unified Power Flow Controller (UPFC) is one of the most advanced FACTS devices that can simultaneously and independently control both the real and reactive power flow in a transmission line....
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Scenario of Electricity Trading in South Asia: Perspective and Feasibility of Trading between India and Bangladesh
Anmona Shabnam Pranti,
Arif Mohammad Shahed Iqubal,
Mohammad Shawkut Ali Khan,
Mohammad Kayesar Ahmmed
Issue:
Volume 2, Issue 6, November 2013
Pages:
156-165
Received:
14 November 2013
Published:
20 December 2013
Abstract: Uninterrupted electricity supply is the precondition of economic development of a country. Bangladesh has huge electrical power deficiency and to minimize this lagging, Government is importing 250 MW electrical power from India. India is itself an electricity deficiency country and has already relationship of trading with two south Asian countries, but the policies of those trading are not beneficial for those respective countries. On the other hand Bangladesh is richer than many other south Asian countries in respect to primary energy reserve. Proper management of this primary energy and electricity sector, to produce and use electricity properly could be a good solution of running electricity scarcity problem of Bangladesh. In some context inter-countries trading is important in south Asia to have a sustainable economic growth when it is beneficial and preserve the right for both countries. Purchasing power from India cannot be a fruitful solution because it will increase our dependency on them. By this trading we may reduce the electricity crisis instantly but could be a cause of long term negative effect on our overall economy. Moreover most of the energy specialists and learned people have negative opinion about this electricity trading. This trading cannot be the good and permanent solution to solve power scarcity problem of this country. Bangladesh should try to be self sufficient in electrical power by proper management and utilization of its own resources instead of spending money for purchasing power from India.
Abstract: Uninterrupted electricity supply is the precondition of economic development of a country. Bangladesh has huge electrical power deficiency and to minimize this lagging, Government is importing 250 MW electrical power from India. India is itself an electricity deficiency country and has already relationship of trading with two south Asian countries,...
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