DSpaceCRIS@UNITENhttp://dspace.uniten.edu.my/jspuiThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Sat, 17 Feb 2018 21:21:05 GMT2018-02-17T21:21:05Z50261- An evolutionary programming approach to optimize synchronous generator input power using area-based transient stability indexeshttp://dspace.uniten.edu.my/jspui/handle/123456789/6404Title: An evolutionary programming approach to optimize synchronous generator input power using area-based transient stability indexes
Authors: Hashim, H.; Abidin, I.Z.; Musirin, I.; Siah Yap, K.; Omar, Y.R.; Zulkepali, M.R.
Abstract: Stable operation of a power system requires a continuous match between energy input to the prime movers and the electrical load of the system. Any change of load demand must be accompanied by a corresponding change in terms of the amount of energy prime mover given to the turbine system. When a power system is subjected to significant transient disturbances, the machine may lose synchronism to the system. If this were to happen, the machine's rotor angle will undergo wide variations, voltage and frequency may deviate widely from normal values. This paper presents the applications of Area-Based Transient Stability Indexes (TSI): COI Angle and COI Speed as a new technique to evaluate the impact of disturbances to power system stability and to optimize the mechanical input power of synchronous generators in order to prevent transient instability in a power system using Evolutionary Programming (EP) approach. Transient analysis is carried out using PSSÒE software on IEEE 118 Bus Test System at system conditions with various types of loads, static and dynamic. The optimization of the input power to generator is carried out using transient stability indexes as fitness functions for a three area IEEE 30 Bus and IEEE 118 Bus Test Systems respectively. Results obtained from the experiment revealed that the EP approach is able to give an optimal solution. © 2005 - 2013 JATIT & LLS. All rights reserved.
Tue, 01 Jan 2013 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/64042013-01-01T00:00:00Z
- Under voltage load shedding using voltage stability indiceshttp://dspace.uniten.edu.my/jspui/handle/123456789/6402Title: Under voltage load shedding using voltage stability indices
Authors: Hamid, M.H.A.; Hashim, H.; Rashid, H.A.A.; Abidin, I.Z.
Abstract: Voltage instability is characterized by loss of a stable operating point due to reactive power deficiency, which causes a drop of voltage profile in significant part of the system. The voltage is stable if the system can maintain its voltage within the acceptable limits when there is a change in load admittance. Voltage collapse may occur when the system is subjected to system fault(s); the occurrence of this phenomenon can be either slowly or drastically depending on the severity of the fault(s) [1]. Therefore, it is more accurate to analyze the system behavior dynamically with respect to voltage stability. This paper presents under voltage load shedding scheme using voltage stability indexes based on system behavior in dynamic environment. © 2014 IEEE.
Wed, 01 Jan 2014 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/64022014-01-01T00:00:00Z
- A methodology to determine suitable placement of solar photovoltaic sources in the transmission system taking into account Voltage Stability Index (VSI)http://dspace.uniten.edu.my/jspui/handle/123456789/6400Title: A methodology to determine suitable placement of solar photovoltaic sources in the transmission system taking into account Voltage Stability Index (VSI)
Authors: Sie, A.W.H.; Abidin, I.Z.; Hashim, H.
Abstract: The integration of solar PVs which is projected to increase over the years creates concerns over stability. Reverse power flow occurs due to high PV penetration into the power system network. PV placement at proper locations in a transmission system is essential to maintain voltage stability. Improper placement will caused voltage stability of the system to be affected. However, if the PVs are connected at a strategic location it will lead to a more stable system. This paper presents a methodology for PV source placement in the transmission system while maintaining the stability of the. Voltage Stability Index (VSI) will be used as an indicator to measure the stability status of the system. Two test systems will be used for simulation for this research, the IEEE 30 Bus and 57 Bus Test System. The simulation results showed that proper placement of the PV source in the transmission system will lead to better stability to the system. © 2014 IEEE.
Wed, 01 Jan 2014 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/64002014-01-01T00:00:00Z
- Optimization of mechanical input power to synchronous generator based on transient stability center-of-inertia: COI angle and COI speedhttp://dspace.uniten.edu.my/jspui/handle/123456789/6405Title: Optimization of mechanical input power to synchronous generator based on transient stability center-of-inertia: COI angle and COI speed
Authors: Hashim, H.; Abidin, I.Z.; Yap, K.S.; Musirin, I.; Zulkepali, M.R.
Abstract: Rotor angle of the machine may accelerate or decelerate due to transient instability depending on the mechanical power or the turbine power, P m and electrical power, Pe. As such, injecting an appropriate mechanical input power in accordance to the electrical power demand and losses at a critical time and condition will avoid major supply interruption due to unnecessary tripping of circuit breaker during transient instability. This paper presents Evolutionary Programming (EP) approach to optimize the mechanical input power in order to prevent transient instability in the system. The optimization is based on Area-based COI-referred Transient Stability Indexes: COI Angle and COI Speed, for a three area system with six generators. Results obtained from the experiment revealed that the EP approach is able to give an optimal solution. © 2011 IEEE.
Sat, 01 Jan 2011 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/64052011-01-01T00:00:00Z
- Changes in fault current levels due to renewable embedded generation in a distribution networkhttp://dspace.uniten.edu.my/jspui/handle/123456789/6403Title: Changes in fault current levels due to renewable embedded generation in a distribution network
Authors: Alvin, T.G.M.; Abidin, I.Z.; Hashim, H.
Abstract: An increased interest in renewable energy such as wind, solar and etc. has reintroduced embedded generation to the power system network. However, traditional networks are designed for power to flow from the grid to the load. The integration of embedded generation into the system brought forth the issue of reverse power flow to system. A reverse flow of power would disrupt the operation of existing protection system in the network by changing the fault currents flowing in the line. This paper investigates the changes to the fault current and the effect of the integration of the embedded generation into existing power system networks. This research uses MATLAB/Simulink to simulate a simple test system network with embedded generation. Initial simulation result shows the reverse power flow lowers the value of the fault current from the grid. This results in a longer tripping time for existing overcurrent relays and possibly disruptions to the coordination of the protection system in the network. © 2013 IEEE.
Tue, 01 Jan 2013 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/64032013-01-01T00:00:00Z
- Phase comparison protection for distribution networks with high PV penetrationhttp://dspace.uniten.edu.my/jspui/handle/123456789/6401Title: Phase comparison protection for distribution networks with high PV penetration
Authors: Alvin, T.G.M.; Abidin, I.Z.; Hashim, H.; Abidin, A.A.Z.
Abstract: With the availability and reduced cost of renewable energy sources such as Solar PV, distributed generation (DG) becomes an increasingly common practice in harnessing these energy sources. However, a high level of penetration of the energy sources in the distribution network will cause issues such as reverse power flow and the disruptions to the coordination of existing protection system. This paper looks on how reverse power flow will affect the tripping times of overcurrent relays and its effect on the coordination of the protection system. This paper also investigates on the possibility of using the phase comparison protection method to improve the coordination of the protection system in a high PV penetration environment. © 2014 IEEE.
Wed, 01 Jan 2014 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/64012014-01-01T00:00:00Z
- Adaptive protection for voltage instability mitigation scenariohttp://dspace.uniten.edu.my/jspui/handle/123456789/6410Title: Adaptive protection for voltage instability mitigation scenario
Authors: Abidin, I.Z.; Ahmad, N.; Zahidi, R.A.; Hashim, H.; Hussein, Z.F.; Omar, Y.R.; Hashim, A.H.
Abstract: Modern power system network are usually operated to its maximum capabilities. This in turn would expose the system towards possible voltage instability condition. Coupled with peak load condition where lines can be loaded to its limit, probable scenarios relating to voltage instability could lead to tripping of overload lines which would then lead to possible cascading tripping; ultimately lead towards voltage collapse condition. However, possible mitigating action is possible which could reduce the line loading and ultimately push the system back towards a voltage stable condition. This paper demonstrates a possibility of this occurring utilizing Fast Voltage Stability Index (FVSI) approaches to quickly assess the network voltage stability. Results show that these mitigating action does improve the stability of the system hence lead to a possible Wide Area Protection application which is synonymously linked to a smart grid system. ©2009 IEEE.
Thu, 01 Jan 2009 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/64102009-01-01T00:00:00Z
- Study of static voltage stability index as an indicator for under voltage load shedding schemeshttp://dspace.uniten.edu.my/jspui/handle/123456789/6411Title: Study of static voltage stability index as an indicator for under voltage load shedding schemes
Authors: Zahidi, R.A.; Abidin, I.Z.; Hashim, H.; Omar, Y.R.; Ahmad, N.; Ali, A.M.
Abstract: Under Voltage Load Shedding (UVLS) has been successfully deployed in many systems throughout the world to protect local systems from voltage collapse. This is particularly true if the system conditions and the contingencies leading to voltage instabilities are of low probability, but would result in serious consequences. However, the locations and how much load to shed requires expert knowledge and experience working with the power grid. This paper will present on utilizing an established index called FVSI (Fast Voltage Stability Index) to act as a numerical verification of the shedding locations. The research work done shows that the FVSI index can be used and load shedding at these points does improve the stability of the system.
Thu, 01 Jan 2009 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/64112009-01-01T00:00:00Z
- Under Frequency Load Shedding (UFLS): Principles and implementationhttp://dspace.uniten.edu.my/jspui/handle/123456789/6407Title: Under Frequency Load Shedding (UFLS): Principles and implementation
Authors: Omar, Y.R.; Abidin, I.Z.; Yusof, S.; Hashim, H.; Abdul Rashid, H.A.
Abstract: Under frequency load shedding is implemented to restore power system frequency stability if system frequency drops below the operational set point during major disturbance such as lost of generation. Different countries/utility companies have their own philosophies in implementing the under frequency load shedding scheme. Generally, it is based on country/utility requirements, e.g. the overall power system network and the country's demographic. This paper presents the principles and implementation of the under frequency load shedding (UFLS) and presented using simulations of 56 test bus-system. The performance of the developed schemes under various conditions of disturbance were compared and analyzed. All the simulation works were performed using Siemens PTI software PSS®E. ©2010 IEEE.
Fri, 01 Jan 2010 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/64072010-01-01T00:00:00Z
- Weak area analysis based on the apparent impedance and voltage indiceshttp://dspace.uniten.edu.my/jspui/handle/123456789/6409Title: Weak area analysis based on the apparent impedance and voltage indices
Authors: Hashim, H.; Omar, Y.R.; Abidin, I.Z.; Zahidi, R.A.; Ahmad, N.; Ali, A.M.
Abstract: Heavily loaded condition may lead to power system instability either due to sudden increase in load or tripping of adjacent transmission line. When load increases, the apparent impedance decreases accordingly depending on the nature of load, similar instances can be observed during short circuit event [1, 2]. In addition, the system may also experience voltage instability originating from high power flow through the transmission line during fault and line outage condition. Hence, the ability for the system to quickly indicate possible voltage instability via fast voltage indicator is important in mitigating voltage instability from being further aggravated. Undesirable disconnection of transmission lines should also be avoided during voltage instability, while load encroachment possibilities into protective zone may cause unnecessary line isolation, which would result in cascading tripping [3, 4]. This paper presents the correlation between the apparent impedance calculated from different contingency scenario and the derived voltage indicator applied to the IEEE 30 Bus Test System. ©2009 IEEE.
Thu, 01 Jan 2009 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/64092009-01-01T00:00:00Z
- An analysis of transient stability using center-of-inertia: Angle and speedhttp://dspace.uniten.edu.my/jspui/handle/123456789/6408Title: An analysis of transient stability using center-of-inertia: Angle and speed
Authors: Hashim, H.; Zulkepali, M.R.; Omar, Y.R.; Ismail, N.; Abidin, I.Z.; Yusof, S.
Abstract: Instability in the system may cause the rotor angle of the machine to accelerate or decelerate depending on the mechanical power and electrical power; most seriously could result to tripping of the machine This paper evaluates the impact of disturbances and types of loads to system stability using Area-based COI-referred Transient Stability Indexes: COI angle and COI speed. The analysis is carried out using PSS®E 32 software on IEEE 118 Bus Test System at system conditions with and without dynamic loads. The network is initially divided into significant areas based on the geographical. ©2010 IEEE.
Fri, 01 Jan 2010 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/64082010-01-01T00:00:00Z
- Study on P-V Curve and V-Q curve of an unbalanced three- phase system with different static loadshttp://dspace.uniten.edu.my/jspui/handle/123456789/7340Title: Study on P-V Curve and V-Q curve of an unbalanced three- phase system with different static loads
Authors: Ramasamy, A.K.; Verayiah, R.; Abidin, I.Z.; Gunalan, S.; Perumal, P.
Abstract: P-V curve and V-Q curve (often term as Q-V curve) are widely used for planning and operation studies. The P-V curve and V-Q curve of an unbalanced three-phase system, unlike the balanced three-phase system, may not have similar loading margin (LM) and reactive power margin (RPM) on each phase. Therefore, DIgSILENT Programming Language (DPL) has been used to study the maximum loading point (MLP), critical point (CP), and also minimum reactive power point (MRPP) on each phase of an unbalanced three-phase system with different static loads. The tracing direction of P-V curve of each phase and the LM and RPM of each phase obtained from the P-V curve and V-Q curve for different static loads are also discussed. On top of that, continuation power flow (CPF) has become a common method to study the MLP. Hence, a simple 2-bus balanced three-phase system is used to validate the result obtained from the DIgSILENT with CPF method. © 2016, Wydawnictwo SIGMA - N O T Sp. z o.o. All rights reserved.
Fri, 01 Jan 2016 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/73402016-01-01T00:00:00Z
- Overcurrent time delay determination using gain scheduled PID controllershttp://dspace.uniten.edu.my/jspui/handle/123456789/7368Title: Overcurrent time delay determination using gain scheduled PID controllers
Authors: Zainul, A.A.; Ramasamy, A.; Abidin, I.Z.; Nagi, F.H.
Abstract: The inverse time overcurrent relay operation is based upon the current setpoint and also the time multiplier setting. Depending on the ratio of the value of the current and the setpoint current together with the value of the time multiplier setting, the amount of time delay for the trip command is determined using the inverse time characteristics. This would mean that the relay is not of the adaptive type and would possibly give a maltripping. This paper uses the concept of PID controller to determine the time delay for the overcurrent relay. ©2009 IEEE.
Thu, 01 Jan 2009 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/73682009-01-01T00:00:00Z
- Cross phase polarization algorithm for fault direction determination using zero crossing method to determine phase differencehttp://dspace.uniten.edu.my/jspui/handle/123456789/7365Title: Cross phase polarization algorithm for fault direction determination using zero crossing method to determine phase difference
Authors: Abidin, A.A.B.Z.; Ramasamy, A.; Abidin, I.Z.; Nagi, F.H.
Abstract: Power systems are usually connected in a condition where there is more than one power supply or voltage source supplying a load. These systems will have protection relays to protect various equipment connected to the system. However in isolating a fault, the direction of the fault needs to be known in order to limit the amount of loss load. This paper shall describe a possible algorithm that could be used in order to perform cross phase polarization. The possible faults that could be detected using this technique include the single phase to ground fault, the phase to phase fault and the double phase to ground fault. Three phase faults require the memory polarization technique that will not be discussed in this paper. The algorithm shall be implemented and tested using the sim power system tool box present in MATLAB. ©2009 IEEE.
Thu, 01 Jan 2009 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/73652009-01-01T00:00:00Z
- FEM and ANN based simulations to study the effect of electrical field distribution on water tree affected polymeric cableshttp://dspace.uniten.edu.my/jspui/handle/123456789/7721Title: FEM and ANN based simulations to study the effect of electrical field distribution on water tree affected polymeric cables
Authors: Sulaiman, S.; Abidin, I.Z.
Abstract: Earlier researches have confirmed that polymeric cables suffer from serious water tree degradation under combined stresses of electrical, thermal and chemical, thus shortening the lifespan of the cables. This paper aims at proposing a methodology using Finite Element Method (FEM) and Artificial Neural Network (ANN) based simulations to estimate the effect and create a database of the electrical field distribution in water tree affected polymeric cables. The water tree lengths in the affected polymeric cables are varied to assess their effect on the level of the electrical field distribution. The permittivity values within the water tree structures are varied accordingly to the lengths measured in water tree growths. The electrical field distribution waveforms arising out of the variation in water tree growths are plotted using FEM software and the results are analysed. Analysis shows that the electrical field distribution levels increases exponentially with the rise in water tree lengths. The results are then translated into electrical field ratios and fed to an ANN simulation. The simulation attempts to create a database for water tree degraded cables with two (2) categories of training inputs i.e. permittivity and water tree length, and a target output of electrical field ratio. The error in the ANN simulation is then marginalised to an error value of less than 1% using the back-propagation method for optimisation of weights. © 2006 IEEE.
Sun, 01 Jan 2006 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/77212006-01-01T00:00:00Z
- An evolutionary programming approach to optimize synchronous generator input power using area-based transient stability indexeshttp://dspace.uniten.edu.my/jspui/handle/123456789/7814Title: An evolutionary programming approach to optimize synchronous generator input power using area-based transient stability indexes
Authors: Hashim, H.; Abidin, I.Z.; Musirin, I.; Siah Yap, K.; Omar, Y.R.; Zulkepali, M.R.
Abstract: Stable operation of a power system requires a continuous match between energy input to the prime movers and the electrical load of the system. Any change of load demand must be accompanied by a corresponding change in terms of the amount of energy prime mover given to the turbine system. When a power system is subjected to significant transient disturbances, the machine may lose synchronism to the system. If this were to happen, the machine's rotor angle will undergo wide variations, voltage and frequency may deviate widely from normal values. This paper presents the applications of Area-Based Transient Stability Indexes (TSI): COI Angle and COI Speed as a new technique to evaluate the impact of disturbances to power system stability and to optimize the mechanical input power of synchronous generators in order to prevent transient instability in a power system using Evolutionary Programming (EP) approach. Transient analysis is carried out using PSSÒE software on IEEE 118 Bus Test System at system conditions with various types of loads, static and dynamic. The optimization of the input power to generator is carried out using transient stability indexes as fitness functions for a three area IEEE 30 Bus and IEEE 118 Bus Test Systems respectively. Results obtained from the experiment revealed that the EP approach is able to give an optimal solution. © 2005 - 2013 JATIT & LLS. All rights reserved.
Tue, 01 Jan 2013 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/78142013-01-01T00:00:00Z
- An analysis of transient stability using center-of-inertia: Angle and speedhttp://dspace.uniten.edu.my/jspui/handle/123456789/7817Title: An analysis of transient stability using center-of-inertia: Angle and speed
Authors: Hashim, H.; Zulkepali, M.R.; Omar, Y.R.; Ismail, N.; Abidin, I.Z.; Yusof, S.
Abstract: Instability in the system may cause the rotor angle of the machine to accelerate or decelerate depending on the mechanical power and electrical power; most seriously could result to tripping of the machine This paper evaluates the impact of disturbances and types of loads to system stability using Area-based COI-referred Transient Stability Indexes: COI angle and COI speed. The analysis is carried out using PSS®E 32 software on IEEE 118 Bus Test System at system conditions with and without dynamic loads. The network is initially divided into significant areas based on the geographical. ©2010 IEEE.
Fri, 01 Jan 2010 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/78172010-01-01T00:00:00Z
- Under Frequency Load Shedding (UFLS): Principles and implementationhttp://dspace.uniten.edu.my/jspui/handle/123456789/7816Title: Under Frequency Load Shedding (UFLS): Principles and implementation
Authors: Omar, Y.R.; Abidin, I.Z.; Yusof, S.; Hashim, H.; Abdul Rashid, H.A.
Abstract: Under frequency load shedding is implemented to restore power system frequency stability if system frequency drops below the operational set point during major disturbance such as lost of generation. Different countries/utility companies have their own philosophies in implementing the under frequency load shedding scheme. Generally, it is based on country/utility requirements, e.g. the overall power system network and the country's demographic. This paper presents the principles and implementation of the under frequency load shedding (UFLS) and presented using simulations of 56 test bus-system. The performance of the developed schemes under various conditions of disturbance were compared and analyzed. All the simulation works were performed using Siemens PTI software PSS®E. ©2010 IEEE.
Fri, 01 Jan 2010 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/78162010-01-01T00:00:00Z
- Weak area analysis based on the apparent impedance and voltage indiceshttp://dspace.uniten.edu.my/jspui/handle/123456789/7819Title: Weak area analysis based on the apparent impedance and voltage indices
Authors: Hashim, H.; Omar, Y.R.; Abidin, I.Z.; Zahidi, R.A.; Ahmad, N.; Ali, A.M.
Abstract: Heavily loaded condition may lead to power system instability either due to sudden increase in load or tripping of adjacent transmission line. When load increases, the apparent impedance decreases accordingly depending on the nature of load, similar instances can be observed during short circuit event [1, 2]. In addition, the system may also experience voltage instability originating from high power flow through the transmission line during fault and line outage condition. Hence, the ability for the system to quickly indicate possible voltage instability via fast voltage indicator is important in mitigating voltage instability from being further aggravated. Undesirable disconnection of transmission lines should also be avoided during voltage instability, while load encroachment possibilities into protective zone may cause unnecessary line isolation, which would result in cascading tripping [3, 4]. This paper presents the correlation between the apparent impedance calculated from different contingency scenario and the derived voltage indicator applied to the IEEE 30 Bus Test System. ©2009 IEEE.
Thu, 01 Jan 2009 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/78192009-01-01T00:00:00Z
- Adaptive protection for voltage instability mitigation scenariohttp://dspace.uniten.edu.my/jspui/handle/123456789/7818Title: Adaptive protection for voltage instability mitigation scenario
Authors: Abidin, I.Z.; Ahmad, N.; Zahidi, R.A.; Hashim, H.; Hussein, Z.F.; Omar, Y.R.; Hashim, A.H.
Abstract: Modern power system network are usually operated to its maximum capabilities. This in turn would expose the system towards possible voltage instability condition. Coupled with peak load condition where lines can be loaded to its limit, probable scenarios relating to voltage instability could lead to tripping of overload lines which would then lead to possible cascading tripping; ultimately lead towards voltage collapse condition. However, possible mitigating action is possible which could reduce the line loading and ultimately push the system back towards a voltage stable condition. This paper demonstrates a possibility of this occurring utilizing Fast Voltage Stability Index (FVSI) approaches to quickly assess the network voltage stability. Results show that these mitigating action does improve the stability of the system hence lead to a possible Wide Area Protection application which is synonymously linked to a smart grid system. ©2009 IEEE.
Thu, 01 Jan 2009 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/78182009-01-01T00:00:00Z
- Study of static voltage stability index as an indicator for under voltage load shedding schemeshttp://dspace.uniten.edu.my/jspui/handle/123456789/7820Title: Study of static voltage stability index as an indicator for under voltage load shedding schemes
Authors: Zahidi, R.A.; Abidin, I.Z.; Hashim, H.; Omar, Y.R.; Ahmad, N.; Ali, A.M.
Abstract: Under Voltage Load Shedding (UVLS) has been successfully deployed in many systems throughout the world to protect local systems from voltage collapse. This is particularly true if the system conditions and the contingencies leading to voltage instabilities are of low probability, but would result in serious consequences. However, the locations and how much load to shed requires expert knowledge and experience working with the power grid. This paper will present on utilizing an established index called FVSI (Fast Voltage Stability Index) to act as a numerical verification of the shedding locations. The research work done shows that the FVSI index can be used and load shedding at these points does improve the stability of the system.
Thu, 01 Jan 2009 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/78202009-01-01T00:00:00Z
- Electric power transmissionhttp://dspace.uniten.edu.my/jspui/handle/123456789/5867Title: Electric power transmission
Authors: Osman, M.; Abidin, I.Z.; Abdullah, T.A.R.T.; Marsadek, M.
Abstract: This chapter covers the basic components used for modeling a transmission network. The models start with the basic resistance (. R), inductance (. L), and capacitance (. C) derivation, which proceed toward the effect of bundling of conductors. Combining the RLC elements, the short, medium, and long line models were derived, which were later simplified to a two-port network equivalent. In addition, since the long transmission network suffers from inductance and capacitance effects, DC transmission alternatives (high voltage DC, HVDC) are introduced, which include the required converter and filter configuration. © 2016 Elsevier Inc.
Thu, 01 Jan 2015 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/58672015-01-01T00:00:00Z
- Shunt active power filter for harmonic compensation of nonlinear loadshttp://dspace.uniten.edu.my/jspui/handle/123456789/8Title: Shunt active power filter for harmonic compensation of nonlinear loads
Authors: Hussien, Z.F.; Atan, N.; Abidin, I.Z.
Abstract: This paper presents the design and simulation of a single-phase shunt active power filter for harmonic and power factor compensation of multiple nonlinear loads. The system is modeled in Matlab Simulink to consist of an uncontrolled rectifier and an AC controller as the nonlinear loads, with an active filter to compensate for the harmonic current injected by the load. The active filter is based on a full-bridge single-phase inverter. The design of the active filter controller is based on time-domain method that consists of three main tasks; to identify the harmonic content and form a synchronized reference, to provide closed-loop control to force the current of the active filter to follow the reference and to regulate the capacitor DC voltage. The spectral analysis of the supply current shows the harmonics produced by the load has been successfully compensated by the active filter. The effect of varying the switching frequency on the performance of the active filter is also presented. Â© 2003 IEEE.
Wed, 01 Jan 2003 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/82003-01-01T00:00:00Z
- Electric power transmissionhttp://dspace.uniten.edu.my/jspui/handle/123456789/8247Title: Electric power transmission
Authors: Osman, M.; Abidin, I.Z.; Abdullah, T.A.R.T.; Marsadek, M.
Abstract: This chapter covers the basic components used for modeling a transmission network. The models start with the basic resistance (. R), inductance (. L), and capacitance (. C) derivation, which proceed toward the effect of bundling of conductors. Combining the RLC elements, the short, medium, and long line models were derived, which were later simplified to a two-port network equivalent. In addition, since the long transmission network suffers from inductance and capacitance effects, DC transmission alternatives (high voltage DC, HVDC) are introduced, which include the required converter and filter configuration. © 2016 Elsevier Inc.
Thu, 01 Jan 2015 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/82472015-01-01T00:00:00Z
- Continual improvement and assessment plan for Mechanical Engineering Programme in UNITENhttp://dspace.uniten.edu.my/jspui/handle/123456789/7021Title: Continual improvement and assessment plan for Mechanical Engineering Programme in UNITEN
Authors: Anuar, A.; Shuaib, N.H.; Mohamed Sahari, K.S.; Abidin, I.Z.
Abstract: This paper describes the continuous quality improvement (CQI) process plan that was developed and implemented by the Department of Mechanical Engineering (DME), Universiti Tenaga Nasional (UNITEN), Malaysia for its Bachelor of Mechanical Engineering Programme. The plan is part of the Outcome-Based Education (OBE) system that is required by the Engineering Accreditation Council (EAC) of Malaysia. DME has implemented OBE approach in the programme for the past 3 years. Throughout the implementation process, the Department has developed ongoing assessment and CQI plan to measure the outcomes and improve the teaching and learning process. This plan, which was first implemented at the end of 2006, has generally shown a positive trend in the teaching and learning process in the programme. This paper also discusses the assessment tools that are used in the continuous quality improvement (CQI) plan. Assessment is one of the important parts in the CQI plan. Direct and indirect measurement methods are used to gather the data which are to be analysed to measure the outcome attainment. The attainment results are used to identify the areas that need to be improved. The assessment plan has been continuously improved to be more effective in measuring the achievement of the OBE implementation in the department. © 2009 IEEE.
Thu, 01 Jan 2009 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/70212009-01-01T00:00:00Z
- Development of nylon-based artificial muscles for the usage in robotic prosthetic limbhttp://dspace.uniten.edu.my/jspui/handle/123456789/6935Title: Development of nylon-based artificial muscles for the usage in robotic prosthetic limb
Authors: Atikah, N.A.; Weng, L.Y.; Anuar, A.; Fat, C.C.; Abidin, I.Z.; Sahari, K.S.M.
Abstract: This paper describes the development of nylon-based artificial muscles that is intended to be used in prosthetic limb for young amputees. Prosthetic limbs are very expensive and this situation is further compounded for young amputees who are very quickly out-grow their prosthesis. The proposed artificial muscles are made of nylon fishing strings from various size such as 0.45mm, 0.55mm, 0.65mm and 1.00mm. These fishing strings were twisted into coils to create Super Coiled Polymers (SCP) and tested using hot air blower. These artificial muscles react counterintuitively, where when it is exposed to heat, contracts, and when cooled, expands. Peltier devices, when switched-on acts as heat pump, where one side is hot and the other is cold. This phenomenon, when affixed in between 2 SCP's, creates tandem motion similar to triceps and biceps. As initial study, the hot side of the Peltier module was tested using these artificial muscles. The string was measured for both its force production, length contraction, the initial results were promising. © 2017 Author(s).
Sun, 01 Jan 2017 00:00:00 GMThttp://dspace.uniten.edu.my/jspui/handle/123456789/69352017-01-01T00:00:00Z