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M.F. Romlie
Department of Electrical and Electronics Engineering, Universiti Teknologi PETRONAS, Perak 32610, Malaysia

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Journal article
Published: 10 August 2021 in Energies
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Islanding detection needs are becoming a pivotal constituent of the power system, since the penetration of distributed generators in the utility power system is continually increasing. Accurate threshold setting is an integral part of the island detection scheme since an inappropriate threshold might cause a hazardous situation. This study looked at the islanding conditions as well as two transient faults, such as a single line to ground fault and a three-phase balance fault, to assess the event distinguishing ability of the proposed method. Therefore, the goal of this research was to determine the threshold of the island if the distributed generator (DG) capacity is greater than the connected feeder load, which is the over-frequency island condition, and if the DG capacity is less than the connected feeder load, which is the under-frequency island condition. The significance of this research work is to propose a new island detection threshold setting method using the slip angle and acceleration angle that comes from phasor measurement unit (PMU) voltage angle data. The proposed threshold setting method was simulated in the PowerWorld simulator on a modified IEEE 30 bus system equipped with DG. There are three different interconnection scenarios in the test system and the performance of the proposed method shows that getting the island threshold for all the scenarios requires a single time step or 20 mile seconds after incepting an island into the network. In addition, it can distinguish between the real islanding threshold and the transient faults threshold.

ACS Style

Ahmed Arefin; Khairul Hasan; Mohammad Othman; Mohd Romlie; Nordin Saad; Nursyarizal Nor; Mohd Abdullah. A Novel Island Detection Threshold Setting Using Phasor Measurement Unit Voltage Angle in a Distribution Network. Energies 2021, 14, 4877 .

AMA Style

Ahmed Arefin, Khairul Hasan, Mohammad Othman, Mohd Romlie, Nordin Saad, Nursyarizal Nor, Mohd Abdullah. A Novel Island Detection Threshold Setting Using Phasor Measurement Unit Voltage Angle in a Distribution Network. Energies. 2021; 14 (16):4877.

Chicago/Turabian Style

Ahmed Arefin; Khairul Hasan; Mohammad Othman; Mohd Romlie; Nordin Saad; Nursyarizal Nor; Mohd Abdullah. 2021. "A Novel Island Detection Threshold Setting Using Phasor Measurement Unit Voltage Angle in a Distribution Network." Energies 14, no. 16: 4877.

Journal article
Published: 10 June 2021 in Energy
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A novel peak load shaving algorithm has been proposed in this study for peak shaving application in hybrid PV-BESS connected Isolated Microgrid (IMG) system. This algorithm will help an IMG system to operate its generation systems optimally and economically along with PV generation unit. An IMG model has been developed in MATLAB/Simulink environment with actual load data, conventional Gas Turbine Generator (GTG), Photovoltaic (PV) generation system and Battery Energy Storage System (BESS). The proposed algorithm has been tested with the designed IMG model. To evaluate the effectiveness of the algorithm, simulation case studies have been conducted with actual load data and actual PV generation data. The simulation results demonstrate that the algorithm can minimize the limitations of the existing methods and it can use the PV generation system effectively. Peak shaving service can be found from this algorithm as a simple and forcible way. A comparative analysis has been conducted of the proposed algorithm with the conventional methods. The comparison results can easily reflect that the proposed algorithm can ensure the optimal use of PV generation system and can serve peak shaving service effectively. It can also ensure an economic and environment friendly system where the existing algorithms are limited to serve these. The proposed algorithm can mitigate the available power issues for hybrid PV-BESS connected system and it can also minimize the operating cost by dispatching the generation units optimally.

ACS Style

Masud Rana; Mohd Fakhizan Romlie; Mohd Faris Abdullah; Moslem Uddin; Rasel Sarkar. A novel peak load shaving algorithm for isolated microgrid using hybrid PV-BESS system. Energy 2021, 234, 121157 .

AMA Style

Masud Rana, Mohd Fakhizan Romlie, Mohd Faris Abdullah, Moslem Uddin, Rasel Sarkar. A novel peak load shaving algorithm for isolated microgrid using hybrid PV-BESS system. Energy. 2021; 234 ():121157.

Chicago/Turabian Style

Masud Rana; Mohd Fakhizan Romlie; Mohd Faris Abdullah; Moslem Uddin; Rasel Sarkar. 2021. "A novel peak load shaving algorithm for isolated microgrid using hybrid PV-BESS system." Energy 234, no. : 121157.

Journal article
Published: 10 May 2021 in IEEE Access
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Fossil fuel-based energy sources are the major contributors to greenhouse gas (GHG) emission and thus the use of renewable energy (RE) is becoming the best alternative to cater for the increasing energy demand in both developing and developed nations. Chipendeke is a rural community in Zimbabwe, in which electricity demand is partially served by the only micro-hydro plant and hence, load shedding is a regular practice to keep essential services running. This study explored suitable opportunity to identify a feasible system with different energy sources that can fullfil the current and projected future load demand of the community. A techno-economic feasibility study for a hybrid RE based power system (REPS) is examined considering various energy sources and cost functions. Six different system configurations have been designed with different sizing combinations to identify the most optimum solution for the locality considering techno-economic and environmental viability. The performance metrics considered to evaluate the best suitable model are; Net Present Cost (NPC), Cost of Energy (COE), Renewable Fraction (RF), excess energy and seasonal load variations. In-depth, sensitivity analyses have been performed to investigate the variations of the studied models with a little variation of input variables. Of the studied configurations, an off-grid hybrid Hydro/PV/DG/Battery system was found to be the most economically feasible compared to other configurations. This system had the lowest NPC and COE of $307,657 and $0.165/kWh respectively and the highest RF of 87.5%. The proposed hybrid system could apply to any other remote areas in the region and anywhere worldwide.

ACS Style

Gm Shafiullah; Tjedza Masola; Remember Samu; Rajvikram Madurai Elavarasan; Sharmina Begum; Umashankar Subramaniam; Mohd Fakhizan Romlie; Mohammad Chowdhury; M. T. Arif. Prospects of Hybrid Renewable Energy-Based Power System: A Case Study, Post Analysis of Chipendeke Micro-Hydro, Zimbabwe. IEEE Access 2021, 9, 73433 -73452.

AMA Style

Gm Shafiullah, Tjedza Masola, Remember Samu, Rajvikram Madurai Elavarasan, Sharmina Begum, Umashankar Subramaniam, Mohd Fakhizan Romlie, Mohammad Chowdhury, M. T. Arif. Prospects of Hybrid Renewable Energy-Based Power System: A Case Study, Post Analysis of Chipendeke Micro-Hydro, Zimbabwe. IEEE Access. 2021; 9 (99):73433-73452.

Chicago/Turabian Style

Gm Shafiullah; Tjedza Masola; Remember Samu; Rajvikram Madurai Elavarasan; Sharmina Begum; Umashankar Subramaniam; Mohd Fakhizan Romlie; Mohammad Chowdhury; M. T. Arif. 2021. "Prospects of Hybrid Renewable Energy-Based Power System: A Case Study, Post Analysis of Chipendeke Micro-Hydro, Zimbabwe." IEEE Access 9, no. 99: 73433-73452.

Journal article
Published: 14 July 2020 in Clean Technologies
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In this paper, an optimization approach for designing a hybrid renewable energy system with zero load rejection is presented for a specific location in Malaysia. The proposed renewble energy system includes photovoltaic system, gas turbine generator and battery bank. The aim of the optimization process is to design the system with a loss of load probability that is less than 1%. An improved numerical algorithm is proposed in this paper. Moreover, a comparison between electrification options, including the existing gas-turbine-based generator (existing system), electricity grid and the proposed system, is presented in terms of the annualized total life-cycle cost. The results show that the proposed system can reduce the annual running cost by USD 2.1 million, while the electricity grid connection option can reduce the annual cost by USD 1.16 million as compared to the existing gas-turbine-based generator. In addition to this, the proposed optimization algorithm provides a reliable power system with zero load rejection based on simulation results.

ACS Style

Mohamed Atef; Tamer Khatib; Muhammad Faris Abdullah; Mohd Fakhizan Romlie. Optimization of a Hybrid Solar PV and Gas Turbine Generator System Using the Loss of Load Probability Index. Clean Technologies 2020, 2, 240 -251.

AMA Style

Mohamed Atef, Tamer Khatib, Muhammad Faris Abdullah, Mohd Fakhizan Romlie. Optimization of a Hybrid Solar PV and Gas Turbine Generator System Using the Loss of Load Probability Index. Clean Technologies. 2020; 2 (3):240-251.

Chicago/Turabian Style

Mohamed Atef; Tamer Khatib; Muhammad Faris Abdullah; Mohd Fakhizan Romlie. 2020. "Optimization of a Hybrid Solar PV and Gas Turbine Generator System Using the Loss of Load Probability Index." Clean Technologies 2, no. 3: 240-251.

Journal article
Published: 14 July 2020 in Energies
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The production of maximum wind energy requires controlling various parts of medium to large-scale wind turbines (WTs). This paper presents a robust pitch angle control system for the rated wind turbine power at a wide range of simulated wind speeds by means of a proportional–integral–derivative (PID) controller. In addition, ant colony optimization (ACO), particle swarm optimization (PSO), and classical Ziegler–Nichols (Z-N) algorithms have been used for tuning the PID controller parameters to obtain within rated stable output power of WTs from fluctuating wind speeds. The proposed system is simulated under fast wind speed variation, and its results are compared with those of the PID-ZN controller and PID-PSO to verify its effeteness. The proposed approach contains several benefits including simple implementation, as well as tolerance of turbine parameters and several nonparametric uncertainties. Robust control of the generator output power with wind-speed variations can also be considered a significant advantage of this strategy. Theoretical analyses, as well as simulation results, indicate that the proposed controller can perform better in a wide range of wind speed compared with the PID-ZN and PID-PSO controllers. The WT model and hybrid controllers (PID-ACO and PID-PSO) have been developed in MATLAB/Simulink with validated controller models. The hybrid PID-ACO controller was found to be the most suitable in comparison to the PID-PSO and conventional PID. The root mean square (RMS) error calculated between the desired power and the WT’s output power with PID-ACO is found to be 0.00036, which is the smallest result among the studied controllers.

ACS Style

Rasel Sarkar; Sabariah Julai; Chong Wen Tong; Moslem Uddin; M.F. Romlie; Gm Shafiullah. Hybrid Pitch Angle Controller Approaches for Stable Wind Turbine Power under Variable Wind Speed. Energies 2020, 13, 3622 .

AMA Style

Rasel Sarkar, Sabariah Julai, Chong Wen Tong, Moslem Uddin, M.F. Romlie, Gm Shafiullah. Hybrid Pitch Angle Controller Approaches for Stable Wind Turbine Power under Variable Wind Speed. Energies. 2020; 13 (14):3622.

Chicago/Turabian Style

Rasel Sarkar; Sabariah Julai; Chong Wen Tong; Moslem Uddin; M.F. Romlie; Gm Shafiullah. 2020. "Hybrid Pitch Angle Controller Approaches for Stable Wind Turbine Power under Variable Wind Speed." Energies 13, no. 14: 3622.

Journal article
Published: 10 February 2020 in Energy
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The objective of this study is to propose a decision-tree-based peak shaving algorithm for islanded microgrid. The proposed algorithm helps an islanded microgrid to operate its generation units efficiently. Effectiveness of the proposed algorithm was tested with a BESS-based MATLAB/Simulink model of an actual microgrid under realistic load conditions which were recorded. To evaluate the performance, simulation case studies were conducted under various load conditions and results were compared with conventional techniques. Results showed that the proposed algorithm offers a simple and effective way of peak load shaving without heavy computational burdens often needed in other methods. The comparison analysis verified that the proposed algorithm can effectively mitigate the peak load demand regardless of the schedule of the generators, where conventional methods were limited. The financial benefit investigation shows that microgrid utility can enjoy substantial savings, while reducing of the peak demand of the microgrid. Thus, the islanded microgrid that include fuel-based generation can implement the proposed technique to reduce the consumption of fuel and increase the efficiency of fuel-based generation through peak load mitigation.

ACS Style

Moslem Uddin; M.F. Romlie; M.F. Abdullah; ChiaKwang Tan; Gm Shafiullah; A.H.A. Bakar. A novel peak shaving algorithm for islanded microgrid using battery energy storage system. Energy 2020, 196, 117084 .

AMA Style

Moslem Uddin, M.F. Romlie, M.F. Abdullah, ChiaKwang Tan, Gm Shafiullah, A.H.A. Bakar. A novel peak shaving algorithm for islanded microgrid using battery energy storage system. Energy. 2020; 196 ():117084.

Chicago/Turabian Style

Moslem Uddin; M.F. Romlie; M.F. Abdullah; ChiaKwang Tan; Gm Shafiullah; A.H.A. Bakar. 2020. "A novel peak shaving algorithm for islanded microgrid using battery energy storage system." Energy 196, no. : 117084.

Journal article
Published: 01 December 2019 in International Journal of Power Electronics and Drive Systems (IJPEDS)
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An electric vehicle (EV) can be charged wirelessly through an inductively coupled power transfer system where the system resonates the inductive coupling coil at the operating frequency by means of a compensation network. However, the resonant behaviour implies overcurrent in the inverter MOSFETs during uncoupled and high load resistor conditions, which affect to the inverter MOSFETs failure whenever the current exceeds their maximum current rating. Therefore, this paper presents a CLL/S detuned compensation network for EV wireless charging application to limit the inverter current during the uncoupled state and open circuit load conditions. The proposed compensation consists of a series capacitor and parallel inductor at the primary side and series capacitor at the secondary side. By using Kirchhoff Voltage Law (KVL) analysis, the primary side is detuned to inductive behaviour to ensure zero voltage switching (ZVS), and the secondary side remains at natural resonant tuning. From the simulation analysis, the slight increase of the parallel inductor value at the primary side can limit of the inverter current at uncoupled and high load resistor conditions. The proposed system also offers higher efficiency than the series-series detuned compensation and slightly lower than the double-sided LCC compensation network at different coupling factor.

ACS Style

Ahmad Fuad Abdul Aziz; Mohd Fakhizan Romlie; Tun Zainal Azni Zulkifli. CLL/S Detuned compensation network for electric vehicles wireless charging application. International Journal of Power Electronics and Drive Systems (IJPEDS) 2019, 10, 2173 -2181.

AMA Style

Ahmad Fuad Abdul Aziz, Mohd Fakhizan Romlie, Tun Zainal Azni Zulkifli. CLL/S Detuned compensation network for electric vehicles wireless charging application. International Journal of Power Electronics and Drive Systems (IJPEDS). 2019; 10 (4):2173-2181.

Chicago/Turabian Style

Ahmad Fuad Abdul Aziz; Mohd Fakhizan Romlie; Tun Zainal Azni Zulkifli. 2019. "CLL/S Detuned compensation network for electric vehicles wireless charging application." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 4: 2173-2181.

Review
Published: 22 October 2019 in IET Power Electronics
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ACS Style

Ahmad Fuad Abdul Aziz; Mohd Fakhizan Romlie; Zuhairi Baharudin. Review of inductively coupled power transfer for electric vehicle charging. IET Power Electronics 2019, 12, 3611 -3623.

AMA Style

Ahmad Fuad Abdul Aziz, Mohd Fakhizan Romlie, Zuhairi Baharudin. Review of inductively coupled power transfer for electric vehicle charging. IET Power Electronics. 2019; 12 (14):3611-3623.

Chicago/Turabian Style

Ahmad Fuad Abdul Aziz; Mohd Fakhizan Romlie; Zuhairi Baharudin. 2019. "Review of inductively coupled power transfer for electric vehicle charging." IET Power Electronics 12, no. 14: 3611-3623.

Journal article
Published: 26 September 2019 in Infrastructures
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In this study, the performance of an islanded gas turbine power generation system in Malaysia was investigated. Considering the low fuel efficiency of the plant during peak and part-load operations, an economic analysis was also carried out, over the period of one year (2017). The case study was conducted on the isolated electrical network of the Universiti Teknologi PETRONAS (UTP), which consists of two gas turbine units with a total capacity of 8.4 MW. Simple performance indicators were developed to assess the performance, which can also be applied to other power stations in Malaysia and elsewhere. Meanwhile, the economy of variable load operations was analyzed using the statistical data of generation, fuel consumption, and loads. The study reveals that the capacity factor of the microgrid in the period was between 52.77–63.32%, as compared to the industrial best practice of 80%. The average plant use factor for the period under review was 75.04%, with a minimum of 70.93% and a maximum of 78.61%. The load factor of the microgrid ranged from 56.68–65.47%, as compared to the international best practice of 80%, while the utilization factor was between 44.22–67.655%. This study further reveals that high fuel consumption rates, due to the peak and part-load operations, resulted in a revenue loss of approximately 17,379.793 USD per year. Based on the present performance of the microgrid, suggestions are made for the improvement of the overall performance and profitability of the system. This work can be valuable for microgrid utility research to identify the most economical operating conditions.

ACS Style

Moslem Uddin; Mohd Fakhizan Romlie; Mohd Faris Abdullah. Performance Assessment and Economic Analysis of a Gas-Fueled Islanded Microgrid—A Malaysian Case Study. Infrastructures 2019, 4, 61 .

AMA Style

Moslem Uddin, Mohd Fakhizan Romlie, Mohd Faris Abdullah. Performance Assessment and Economic Analysis of a Gas-Fueled Islanded Microgrid—A Malaysian Case Study. Infrastructures. 2019; 4 (4):61.

Chicago/Turabian Style

Moslem Uddin; Mohd Fakhizan Romlie; Mohd Faris Abdullah. 2019. "Performance Assessment and Economic Analysis of a Gas-Fueled Islanded Microgrid—A Malaysian Case Study." Infrastructures 4, no. 4: 61.

Journal article
Published: 26 August 2019 in Electronics
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This paper aims to develop a new switched inductor assisted strong boost Z-source inverter (SL-SBZSI) topology with high voltage gain and analyze the steady-state characteristics of the proposed topology. In the proposed topology, two switched inductors are used within the series impedance structure of the Z-source inverter (ZSI) in order to achieve the high voltage gain. The steady-state characteristics of the proposed topology are analyzed to disseminate its several advantages as compared to traditional ZSIs. The key advantages include the higher boost factor with lower shoot-through duty ratio and lower voltage stresses on capacitors as well as on switches of the inverter bridge. Furthermore, the proposed topology has the soft-start ability which significantly reduces the inrush start-up current while comparing with the traditional ZSI. In the proposed topology, a common ground is shared between the output AC voltage and the input DC voltage source which categorizes this topology to the doubly grounded inverter. The characteristics of the proposed SL-SBZSI are analyzed by considering two operating condition where the simple boost pulse width modulation (PWM) scheme is used to extract the shoot-through pulses. The characteristics of the proposed topology are also compared with different existing topologies along with the conventional modified capacitor assisted Z-source inverter (MCA-ZSI), whose boost factor is much closer to the proposed topology. Rigorous mathematical analyses are presented to clearly demonstrate the benefits of the proposed topology while simulation studies are carried out to demonstrate its distinct features as compared to the existing topology. Finally, experimental studies are conducted to further validate the theoretical and simulation results.

ACS Style

Nafis Subhani; Ramani Kannan; Apel Mahmud; Tushar Kanti Roy; Mohd Fakhizan Romlie. Analysis of Steady-State Characteristics for a Newly Designed High Voltage Gain Switched Inductor Z-Source Inverter. Electronics 2019, 8, 940 .

AMA Style

Nafis Subhani, Ramani Kannan, Apel Mahmud, Tushar Kanti Roy, Mohd Fakhizan Romlie. Analysis of Steady-State Characteristics for a Newly Designed High Voltage Gain Switched Inductor Z-Source Inverter. Electronics. 2019; 8 (9):940.

Chicago/Turabian Style

Nafis Subhani; Ramani Kannan; Apel Mahmud; Tushar Kanti Roy; Mohd Fakhizan Romlie. 2019. "Analysis of Steady-State Characteristics for a Newly Designed High Voltage Gain Switched Inductor Z-Source Inverter." Electronics 8, no. 9: 940.

Journal article
Published: 29 January 2019 in Electronics
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In this paper, the performance of a new Z-source inverter (ZSI)-based single-stage power conditioning system (PCS) is analyzed for a standalone photovoltaic (PV) power generation system. The proposed ZSI-based PCS includes two main parts: one is the input from PV units and the other is the ZSI. In this work, a new topology, termed the switched inductor-assisted strong boost ZSI (SL-SBZSI), is introduced for improving the performance of the PCS. The proposed topology shows high boosting capability during the voltage sag in PV units due to variations in solar irradiation and temperature. Another key advantage is the reduced capacitor voltage stress and semiconductor switch voltage stress of the inverter bridge, which ultimately minimizes the size and cost of the single-stage PCS. The proposed ZSI topology falls under the doubly grounded category of inverter by sharing the common ground between the input and output. This is an additional feature that can minimize the leakage current of PV units at the ac output end. The operational principles, detailed mathematical modeling, and characteristics of the proposed SL-SBZSI for a standalone photovoltaic (PV) power generation system is presented in this paper for analyzing performance. The simulation results, which are performed in MATLAB/Simulink, demonstrate the improved performance of the proposed SL-SBZSI for the standalone PV system. The performance of the proposed topology is also evaluated through an experimental validation on a laboratory-based PV system.

ACS Style

Nafis Subhani; Ramani Kannan; Apel Mahmud; Mohd Fakhizan Romlie. Performance Analysis of a Modernized Z-Source Inverter for Robust Boost Control in Photovoltaic Power Conditioning Systems. Electronics 2019, 8, 139 .

AMA Style

Nafis Subhani, Ramani Kannan, Apel Mahmud, Mohd Fakhizan Romlie. Performance Analysis of a Modernized Z-Source Inverter for Robust Boost Control in Photovoltaic Power Conditioning Systems. Electronics. 2019; 8 (2):139.

Chicago/Turabian Style

Nafis Subhani; Ramani Kannan; Apel Mahmud; Mohd Fakhizan Romlie. 2019. "Performance Analysis of a Modernized Z-Source Inverter for Robust Boost Control in Photovoltaic Power Conditioning Systems." Electronics 8, no. 2: 139.

Conference paper
Published: 05 November 2018 in MATEC Web of Conferences
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The objective of this paper is to investigate the impact of the spiral coil shape of inductive coupled power transfer on its performance. The coil shapes evaluated are: circular, square and pentagon spiral shapes. The coils are modelled in Ansoft Maxwell software. Simulations are carried out to determine the mutual inductance, coupling coefficient and magnetic flux density. The performance in term of magnetic flux density, mutual inductance and coupling coefficient of the three coils shapes are compared. Of the three shapes, the pentagon is shown to have the best performance in term of its mutual inductance, coupling coefficient and magnetic flux density.

ACS Style

Mohd Fakhizan Romlie; Kevin Lau; Mohd Zaifulrizal Zainol; Mohd Faris Abdullah; Ramani Kannan. Performance of Inductive Coupled Power Transfer Versus the Coil Shape - Investigation using Finite Element Analysis. MATEC Web of Conferences 2018, 225, 01017 .

AMA Style

Mohd Fakhizan Romlie, Kevin Lau, Mohd Zaifulrizal Zainol, Mohd Faris Abdullah, Ramani Kannan. Performance of Inductive Coupled Power Transfer Versus the Coil Shape - Investigation using Finite Element Analysis. MATEC Web of Conferences. 2018; 225 ():01017.

Chicago/Turabian Style

Mohd Fakhizan Romlie; Kevin Lau; Mohd Zaifulrizal Zainol; Mohd Faris Abdullah; Ramani Kannan. 2018. "Performance of Inductive Coupled Power Transfer Versus the Coil Shape - Investigation using Finite Element Analysis." MATEC Web of Conferences 225, no. : 01017.

Conference paper
Published: 05 November 2018 in MATEC Web of Conferences
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This paper evaluates the potential of Quaid-e-Azam Solar Park (QASP), Pakistan and examines its impact on distribution networks. To estimate the PV plant yields, solar park’s historical hourly weather data from the years 2000 - 2014 is used. For handling of such huge data, the yearly data is partitioned into four seasons. Further, the seasonal data is modelled by using Beta Probability Density Function (PDF) and a 24 hour solar curve for each season is generated. The solar farm power outputs are tested in IEEE 33 bus distribution network by using time-varying seasonal hourly loads, meanwhile system losses and bus voltages are calculated. The results show that with the passage of time, the impact of solar PV power on reduction of system losses gradually decrease due to yearly degradation of PV module efficiency. System losses at end of PV farm life are 10 - 12% higher than those losses as in the first year. Furthermore, low voltage buses also pose to risk as system voltages also start to decrease. From the analysis, it is suggested that for maintaining the quality of network, time varying detailed assessments should be performed during the calculations of sizing of distributed generation.

ACS Style

Abid Ali Jamali; Nursyarizal Mohd Nor; Taib Ibrahim; Mohd Fakhizan Romlie; Zahid Khan. Impact of Photovoltaic Plant Outputs in Distribution Networks. MATEC Web of Conferences 2018, 225, 04024 .

AMA Style

Abid Ali Jamali, Nursyarizal Mohd Nor, Taib Ibrahim, Mohd Fakhizan Romlie, Zahid Khan. Impact of Photovoltaic Plant Outputs in Distribution Networks. MATEC Web of Conferences. 2018; 225 ():04024.

Chicago/Turabian Style

Abid Ali Jamali; Nursyarizal Mohd Nor; Taib Ibrahim; Mohd Fakhizan Romlie; Zahid Khan. 2018. "Impact of Photovoltaic Plant Outputs in Distribution Networks." MATEC Web of Conferences 225, no. : 04024.

Conference paper
Published: 01 August 2018 in 2018 International Conference on Intelligent and Advanced System (ICIAS)
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The Z-source inverter (ZSI) has the buck and boost ability by unique shoot through characteristics having an impedance network. However, traditional ZSI suffers from its own limitations, high capacitor voltage stress and limited boost capacity. This paper proposes a novel topology of modified ZSI using two switched inductor cell with series impedance network configuration in order to overcome the shortcomings of traditional ZSI. In the proposed modified ZSI, low capacitor voltage stress and high voltage boost exhibits simultaneously. The control strategy of the proposed topology will be same as the traditional one, so all existing modulation techniques can be applied. Different operation modes of proposed inverter have been explained. The simulation results are obtained from Matlab/Simulink and verified the accuracy of the contents provided.

ACS Style

Nafis Subhani; Ramani Kannan; Mohd Fakhizan Romlie. Modified Topology of Z-Source Inverter by Switched Inductor with Series Impedance Network. 2018 International Conference on Intelligent and Advanced System (ICIAS) 2018, 1 -5.

AMA Style

Nafis Subhani, Ramani Kannan, Mohd Fakhizan Romlie. Modified Topology of Z-Source Inverter by Switched Inductor with Series Impedance Network. 2018 International Conference on Intelligent and Advanced System (ICIAS). 2018; ():1-5.

Chicago/Turabian Style

Nafis Subhani; Ramani Kannan; Mohd Fakhizan Romlie. 2018. "Modified Topology of Z-Source Inverter by Switched Inductor with Series Impedance Network." 2018 International Conference on Intelligent and Advanced System (ICIAS) , no. : 1-5.

Conference paper
Published: 01 August 2018 in 2018 International Conference on Intelligent and Advanced System (ICIAS)
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Load flow (LF) analysis is an inextricable part of an in-depth study on microgrid. In this study, AC load flow method was used in MATLAB environment to evaluate the performance of an islanded microgrid. The future directions had also been outlined from the analysis results to improve the overall performance of the microgrid. Simulation case study was conducted on an isolated electrical network of Universiti Teknologi PETRONAS (UTP) which consists of 27 buses. To achieve the goal, voltage magnitude and phase angle at each bus bar, total power flow (both active and reactive) in branches, and power losses in microgrid were computed from load flow analysis. The comparison and analysis of load flow results revealed that this simulation approximately depict the precise situation of the real time system as found in the UTP microgrid. Every component of UTP microgrid network tested to determine whether it is under or over loaded. These results indicated that all elements are within TNBs specifications. After the full load simulation, the impact of several parameters upon the performance was demonstrated, and alternatives were suggested to improve the performance.

ACS Style

Moslem Uddin; Mohd Fakhizan Romlie; Mohd Faris Abdullah. Performance Evaluation of Islanded Microgrid Using Load Flow Analysis Technique. 2018 International Conference on Intelligent and Advanced System (ICIAS) 2018, 1 -6.

AMA Style

Moslem Uddin, Mohd Fakhizan Romlie, Mohd Faris Abdullah. Performance Evaluation of Islanded Microgrid Using Load Flow Analysis Technique. 2018 International Conference on Intelligent and Advanced System (ICIAS). 2018; ():1-6.

Chicago/Turabian Style

Moslem Uddin; Mohd Fakhizan Romlie; Mohd Faris Abdullah. 2018. "Performance Evaluation of Islanded Microgrid Using Load Flow Analysis Technique." 2018 International Conference on Intelligent and Advanced System (ICIAS) , no. : 1-6.

Conference paper
Published: 01 August 2018 in 2018 International Conference on Intelligent and Advanced System (ICIAS)
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This paper investigates the effect of ferrite material on energy transfer by considering a different number of ferrite bars and sizes for electric vehicle (EV) wireless charging application. There are five cases employed on the circular magnetic structure. Case 1 is a coupled coil without any ferrite material for benchmarking of the other four cases. Case 2 and 3 have the same total size of bars lied on the coils but different number of bars which are 12 and 14 bars, respectively. Case 4 and 5 have a similar number of bars as case 2 and 3, respectively, but the width of each bar was increased from 30 mm to 40 mm wide. All these cases are modelled in ANSYS Maxwell software where the flux densities are simulated and the energy transfers are analysed. The simulation results indicate the performance of case 3 with 14 ferrite bars and 30 mm wide for each bar is the best of all cases considering the utilization of ferrite bar and the amount of energy transferred. The analysis shows that the number of ferrite bar, its dimension and sizes have significant effect to the energy transferred in the wireless power system.

ACS Style

Ahmad Fuad Abdul Aziz; Nur Atikah Binti Anuar; Mohd Zaifulrizal Zainol; Mohd Fakhizan Romlie. Effect of Ferromagnetic Material in Circular Magnetic Structure for Electric Vehicle Wireless Power Transfer. 2018 International Conference on Intelligent and Advanced System (ICIAS) 2018, 1 -6.

AMA Style

Ahmad Fuad Abdul Aziz, Nur Atikah Binti Anuar, Mohd Zaifulrizal Zainol, Mohd Fakhizan Romlie. Effect of Ferromagnetic Material in Circular Magnetic Structure for Electric Vehicle Wireless Power Transfer. 2018 International Conference on Intelligent and Advanced System (ICIAS). 2018; ():1-6.

Chicago/Turabian Style

Ahmad Fuad Abdul Aziz; Nur Atikah Binti Anuar; Mohd Zaifulrizal Zainol; Mohd Fakhizan Romlie. 2018. "Effect of Ferromagnetic Material in Circular Magnetic Structure for Electric Vehicle Wireless Power Transfer." 2018 International Conference on Intelligent and Advanced System (ICIAS) , no. : 1-6.

Chapter
Published: 09 June 2018 in Understanding the Bigger Energy Picture
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Due to the limitations of fossil fuel reserves and environmental issues, distributed renewable energy resources (DRER) have become a good alternative solution for producing electricity.

ACS Style

Nursyarizal Mohd Nor; Abid Ali; Taib Ibrahim; Mohd Fakhizan Romlie. Planning of Distributed Renewable Energy Resources Using Genetic Algorithm. Understanding the Bigger Energy Picture 2018, 37 -64.

AMA Style

Nursyarizal Mohd Nor, Abid Ali, Taib Ibrahim, Mohd Fakhizan Romlie. Planning of Distributed Renewable Energy Resources Using Genetic Algorithm. Understanding the Bigger Energy Picture. 2018; ():37-64.

Chicago/Turabian Style

Nursyarizal Mohd Nor; Abid Ali; Taib Ibrahim; Mohd Fakhizan Romlie. 2018. "Planning of Distributed Renewable Energy Resources Using Genetic Algorithm." Understanding the Bigger Energy Picture , no. : 37-64.

Journal article
Published: 22 March 2018 in Energies
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Optimal operation is an important aspect of energy efficiency that can be employed to reduce power consumption. In cooling systems, the chillers consume a large amount of electricity, especially if they are not optimally operated, therefore, they cannot produce the required or rated cooling load capacity. The objective of this paper is to improve coefficient of performance (COP) for the operation of chillers and to reduce power consumption. Two contributions in this work are: (1) the prediction of a model by using Adaptive Neuro-Fuzzy Inference System (ANFIS)-based Fuzzy Clustering Subtractive (FCS), and (2) the classification and optimization of the predicted models by using an Accelerated Particle Swarm Optimization (APSO) algorithm. Particularly, in contribution (1), two models are developed to predict/assess power consumption and cooling load capacity. While in contribution (2), the predictive model’s data obtained are used to classify the operating performance of the chiller and to optimize the model in order to reduce power consumption and cooling capacity. Therefore, data classification by APSO is used to enhance the coefficient of performance (COP). The proposed technique reduces the total power consumption by 33.2% and meets the cooling demand requirements. Also, it improves the cooling performance based on COP, thus resulting in a 15.95% increase in efficiency compared to the existing cooling system. The studied ANFIS-based FCS outperforms the ANFIS-based fuzzy C-means clustering in terms of the regression. Then, the algorithm-based classifier APSO has better results compared to the conventional particle swarm optimization (PSO). The data was acquired from the District Cooling System (DCS) at the Universiti Teknologi Petronas (UTP) campus in Malaysia.

ACS Style

Elnazeer Ali Hamid Abdalla; Perumal Nallagownden; Nursyarizal Bin Mohd Nor; Mohd Fakhizan Romlie; Sabo Miya Hassan. An Application of a Novel Technique for Assessing the Operating Performance of Existing Cooling Systems on a University Campus. Energies 2018, 11, 719 .

AMA Style

Elnazeer Ali Hamid Abdalla, Perumal Nallagownden, Nursyarizal Bin Mohd Nor, Mohd Fakhizan Romlie, Sabo Miya Hassan. An Application of a Novel Technique for Assessing the Operating Performance of Existing Cooling Systems on a University Campus. Energies. 2018; 11 (4):719.

Chicago/Turabian Style

Elnazeer Ali Hamid Abdalla; Perumal Nallagownden; Nursyarizal Bin Mohd Nor; Mohd Fakhizan Romlie; Sabo Miya Hassan. 2018. "An Application of a Novel Technique for Assessing the Operating Performance of Existing Cooling Systems on a University Campus." Energies 11, no. 4: 719.

Journal article
Published: 01 March 2018 in Journal of Renewable and Sustainable Energy
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The integration of distribution generation (DG) in distribution networks with improper planning adversely influences the quality of the electrical networks. Conventionally, the outputs from the intermittent DGs, such as solar photovoltaic (PV) plants, are assumed dispatchable. The intermittency of solar irradiance on the outputs of the PV modules has been ignored in most studies on the sizing and placement of DGs. By looking at this problem, this paper presents the sizing and placement of a distributed solar photovoltaic plant (DSPP) by using time series historical weather data. To predict the output from the PV modules, 15 years of solar data were modeled with the aid of a beta probability density function. The total energy loss index was formulated as the main objective function, and the optimization problem was solved by mixed integer optimization by using genetic algorithm. By adopting a time-varying commercial load, the proposed algorithm was applied on IEEE 33 bus and IEEE 69 bus distribution networks. The numerical studies on the two distribution networks show the advantages of the proposed approach for minimizing the total energy losses and improving the bus voltage profiles. It was revealed that up to 38% of the total energy losses in distribution networks could be reduced at sites with solar insolation of 5.65 peaks sun hours. In contrast to existing methods, planning for DGs by using weather data provided more realistic results for DSPP in distribution networks.

ACS Style

Abid Ali; Nursyarizal Mohd Nor; Taib Ibrahim; Mohd Fakhizan Romlie. Sizing and placement of solar photovoltaic plants by using time-series historical weather data. Journal of Renewable and Sustainable Energy 2018, 10, 023702 .

AMA Style

Abid Ali, Nursyarizal Mohd Nor, Taib Ibrahim, Mohd Fakhizan Romlie. Sizing and placement of solar photovoltaic plants by using time-series historical weather data. Journal of Renewable and Sustainable Energy. 2018; 10 (2):023702.

Chicago/Turabian Style

Abid Ali; Nursyarizal Mohd Nor; Taib Ibrahim; Mohd Fakhizan Romlie. 2018. "Sizing and placement of solar photovoltaic plants by using time-series historical weather data." Journal of Renewable and Sustainable Energy 10, no. 2: 023702.

Review
Published: 01 February 2018 in Renewable and Sustainable Energy Reviews
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ACS Style

Moslem Uddin; Mohd Fakhizan Romlie; Mohd Faris Abdullah; Syahirah Abd Halim; Ab Halim Abu Bakar; Tan Chia Kwang. A review on peak load shaving strategies. Renewable and Sustainable Energy Reviews 2018, 82, 3323 -3332.

AMA Style

Moslem Uddin, Mohd Fakhizan Romlie, Mohd Faris Abdullah, Syahirah Abd Halim, Ab Halim Abu Bakar, Tan Chia Kwang. A review on peak load shaving strategies. Renewable and Sustainable Energy Reviews. 2018; 82 ():3323-3332.

Chicago/Turabian Style

Moslem Uddin; Mohd Fakhizan Romlie; Mohd Faris Abdullah; Syahirah Abd Halim; Ab Halim Abu Bakar; Tan Chia Kwang. 2018. "A review on peak load shaving strategies." Renewable and Sustainable Energy Reviews 82, no. : 3323-3332.