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Bulletin of Electrical Engineering and Informatics
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Bulletin of Electrical Engineering and Informatics ISSN: 2302-9285 is open to submission from scholars and experts in the wide areas of electrical, electronics, instrumentation, control, telecommunication, computer engineering, computer science, information technology and informatics from the global world. The journal publishes original papers in the field of electrical (power), electronics, instrumentation & control, telecommunication and computer engineering; computer science; information technology and informatics. Authors must strictly follow the guide for authors. Please read these instructions carefully and follow them strictly. In this way you will help ensure that the review and publication of your paper is as efficient and quick as possible. The editors reserve the right to reject manuscripts that are not in accordance with these instructions.
Articles
309
Articles
Signal-to-noise Ratio Study on Pipelined Fast Fourier Transform Processor

L. M. Hassan, S. ( Universiti Teknologi Mara Universiti Putra Malaysia ) , Sulaiman, N. ( Universiti Putra Malaysia ) , S. Shariffudin, S. ( Universiti Teknologi Mara ) , N. T. Yaakub, T. ( Universiti Teknologi Mara )

Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

Fast Fourier transform (FFT) processor is a prevailing tool in converting signal in time domain to frequency domain. This paper provides signal-to-noise ratio (SNR) study on 16-point pipelined FFT processor implemented on field-programable gate array (FPGA). This processor can be used in vast digital signal applications such as wireless sensor network, digital video broadcasting and many more. These applications require accuracy in their data communication part, that is why SNR is an important analysis. SNR is a measure of signal strength relative to noise. The measurement is usually in decibles (dB). Previously, SNR studies have been carried out in software simulation, for example in Matlab. However, in this paper, pipelined FFT and SNR modules are developed in hardware form. SNR module is designed in Modelsim using Verilog code before implemented on FPGA board. The SNR module is connected directly to the output of the pipelined FFT module. Three different pipelined FFT with different architectures were studied. The result shows that SNR for radix-8 and R4SDC FFT architecture design are above 40dB, which represent a very excellent signal. SNR module on the FPGA and the SNR results of different pipelined FFT architecture can be consider as the novelty of this paper.

PAPR Reduction Using Huffman and Arithmetic Coding Techniques in F-OFDM System

Idris, Azlina ( Universiti Teknologi MARA (UiTM) ) , Atiqah Md Deros, Nur ( Universiti Teknologi MARA (UiTM) ) , Taib, Idris ( Universiti Teknologi MARA (UiTM) ) , Kassim, Murizah ( Universiti Teknologi MARA (UiTM) ) , Danial Rozaini, Mohd ( Universiti Teknologi MARA (UiTM) ) , Mohd Ali, Darmawaty ( Universiti Teknologi MARA (UiTM) )

Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

Filtered orthogonal frequency division multiplexing (F-OFDM) was introduced to overcome the high side lobes in the OFDM system. Filtering is implemented in the system to reduce the out-of-band emission (OOBE) for the spectrum utilization and to meet the diversified expectation of the upcoming 5G networks. The main drawback in the system is the high peak to average ratio (PAPR). This paper investigates the method used in reducing the PAPR in the F-OFDM system. The proposed method using the block coding technique to overcome the problem of high PAPR are the Arithmetic coding and Huffman coding. This research evaluates the performance of F-OFDM system based on the PAPR values. From the simulation results, the PAPR reduction of the Arithmetic coding is 8.9% lower, while the Huffman Coding is 6.7% lower in the F-OFDM system. The results prove that the Arithmetic Coding will out-perform the Huffman coding in the F-OFDM system.

0.18µm-CMOS Rectifier with Boost-converter and Duty-cycle-control for Energy Harvesting

Radzuan, Roskhatijah ( Universiti Teknologi Mara ) , Khairul Mohd Salleh, Mohd ( Universiti Teknologi Mara ) , A. Rhaffor, Nuha ( Universiti Sains Malaysia ) , Korakkottil Kunhi Mohd, Shukri ( Universiti Sains Malaysia )

Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

Existing works on battery-less of energy harvesting systems often assume as a high efficiency of rectifier circuit for power management system. In practice, rectifier circuit often varies with output power and circuit complexity. In this paper, based on a review of existing rectifier circuits for the energy harvesters in the literature, an integrated rectifier with boost converter for output power enhancement and complexity reduction of power management system is implemented through 0.18-micron CMOS process. Based on this topology and technology, low threshold-voltage of MOSFETs is used instead of diodes in order to reduce the power losses of the integrated rectifier circuit. Besides, a single switch with the duty-cycle control is introduced to reduce the complexities of the integrated boost converter. Measurement results show that the realistic performances of the rectifier circuit could be considerably improved based on the performances showed by the existing study.

Hybrid Stand-alone Photovoltaic Systems Sizing Optimization Based on Load Profile

Othman, Zulkifli ( Universiti Teknologi Mara (UiTM) ) , Irwan Sulaiman, Shahril ( Universiti Teknologi Mara (UiTM) ) , Musirin, Ismail ( Universiti Teknologi Mara (UiTM) ) , Maliki Omar, Ahmad ( Universiti Teknologi Mara (UiTM) ) , Shaari, Sulaiman ( Universiti Teknologi Mara (UiTM) )

Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

This paper presents a sizing optimization technique for Hybrid Stand-Alone Photovoltaic (HSAPV). In this research, three optimization techniques have been developed, namely Dolphin Echolocation Algorithm (DEA), Fast Evolutionary Programming (FEP), and Classical Evolutionary Programming (CEP). These techniques have been incorporated into the sizing process to maximize the technical performance of the SAPV system. The components of PV modules, charge controllers, inverters, and batteries are used to determine the optimum value. These components are used as the control parameters to maximize the expected performance ratio (PR) of the SAPV system. The Iterative Sizing Algorithm (ISA) is the benchmarking technique to conduct the optimization technique achieving maximum PR value and minimal computation time. Results obtained from the research show that DE overcomes FEP and CEP. In addition, the optimization techniques also demonstrated comparatively fast with respect to ISA as the benchmark technique."

Load Management for Voltage Control Study Using Parallel Immunized-computational Intelligence Technique

Izzat Abu Bakar, Amirul ( Universiti Teknologi MARA ) , Khairuzzaman Mohamad Zamani, Mohamad ( Universiti Teknologi MARA ) , Musirin, Ismail ( Universiti Teknologi MARA ) , Azura Md Ghani, Nor ( Universiti Teknologi MARA )

Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

The increase of power demand is a crucial issue in the power system community in many parts of the world. Malaysia has also witnessed the familiar scenario due to the current development throughout the country has invited the urgency of increase in the power supply. Since Malaysia practices vertical system; where the electricity is supplied by only one utility, load management is an important issue so that the delivery of electricity is implemented without discrimination. Parallel Computational Intelligence will be developed which can alleviate and avoid all the unsolved issues, highlighting the weakness of current schemes. Parallel Computational Intelligence is developed to manage the optimal load in making sure the system maintains the stability condition, within the voltage limits. This paper presents evolutionary programming (EP) technique for optimizing the voltage profile. In this study, 3 algorithms which are Gaussian, Cauchy and Parallel EP were developed to solve optimal load management problem on IEEE 26-bus Reliability Test System (RTS). Results obtained from the study revealed that the application of Parallel EP has significantly reduced the time for the optimization process to complete.

A Review of Low Power Wide Area Technology in Licensed and Unlicensed Spectrum for IoT Use Cases

Laili Ismail, Noor ( Universiti Teknologi MARA (UiTM) ) , Kassim, Murizah ( Universiti Teknologi MARA (UiTM) ) , Ismail, Mahamod ( Universiti Kebangsaan Malaysia (UKM) ) , Mohamad, Roslina ( Universiti Teknologi MARA (UiTM) )

Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

There are many platforms in licensed and license free spectrum that support LPWA (low power wide area) technology in the current markets. However, lack of standardization of the different platforms can be a challenge for an interoperable IoT environment. Therefore understanding the features of each technology platform is essential to be able to differentiate how the technology can be matched to a specific IoT application profile. This paper provides an analysis of LPWA underlying technology in licensed and unlicensed spectrum by means of literature review and comparative assessment of Sigfox, LoRa, NB-IoT and LTE-M. We review their technical aspect and discussed the pros and cons in terms of their technical and other deployment features. General IoT application requirements is also presented and linked to the deployment factors to give an insight of how different applications profiles is associated to the right technology platform, thus provide a simple guideline on how to match a specific application profile with the best fit connectivity features.

Results of Fitted Neural Network Models on Malaysian Aggregate Dataset

Azura Md Ghani, Nor ( Universiti Teknologi MARA ) , Bin Ahmad Kamaruddin, Saadi ( Universiti Teknologi MARA ) , Musirin, Ismail ( Universiti Teknologi MARA ) , Hashim, Hishamuddin

Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

This result-based paper presents the best results of both fitted BPNN-NAR and BPNN-NARMA on MCCI Aggregate dataset with respect to different error measures.  This section discusses on the results in terms of the performance of the fitted forecasting models by each set of input lags and error lags used, the performance of the fitted forecasting models by the different hidden nodes used, the performance of the fitted forecasting models when combining both inputs and hidden nodes, the consistency of error measures used for the fitted forecasting models, as well as the overall best fitted forecasting models for Malaysian aggregate cost indices dataset.

Comparison of Solar Radiation Intensity Forecasting Using ANFIS and Multiple Linear Regression Methods

Suyono, Hadi ( Universitas Brawijaya ) , Nur Hasanah, Rini ( Universitas Brawijaya ) , A. Setyawan, R. ( Universitas Brawijaya ) , Mudjirahardjo, Panca ( Universitas Brawijaya ) , Wijoyo, Anthony ( Universitas Brawijaya ) , Musirin, Ismail ( Universiti Teknologi MARA )

Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

Solar radiation forecasting is important in solar energy power plants (SEPPs) development. The electrical energy generated from the sunlight depends on the weather and climate conditions in the area where the SEPPs are installed. The condition of solar irradiation will indirectly affect the electrical grid system into which the SEPPs are injected, i.e. the amount and direction of the power flow, voltage, frequency, and also the dynamic state of the system. Therefore, the prediction of solar radiation condition is very crucial to identify its impact into the system. There are many methods in determining the prediction of solar radiation, either by mathematical approach or by heuristic approach such as artificial intelligent method. This paper analyzes the comparison of two methods, Adaptive Neuro Fuzzy Inference (ANFIS) method, which belongs into the heuristic methods, and Multiple Linear Regression (MLP) method, which uses a mathematical approach. The performance of both methods is measured using the root mean square error (RMSE) and the mean absolute error (MAE) values. The data of the Swiss Basel city from Meteoblue are used to test the performance of the two methods being compared. The data are divided into four cases, being classified as the training data and the data used as predictions. The solar radiation prediction using the ANFIS method indicates the results which are closer to the real measurement results, being compared to the the use MLP method. The average values of RMSE and MAE achieved are 123.27 W/m2 and 90.91 W/m2 using the ANFIS method, being compared to 138.70 W/m2 and 101.56 W/m2 respectively using the MLP method. The ANFIS method gives better prediction performance of 12.51% for RMSE and 11.71% for MAE with respect to the use of the MLP method.

Harmonic Contribution Analysis of Electric Arc Furnace by Using Spectrogram

H. Jopri, M. ( Universiti Teknikal Malaysia Melaka (UTeM) ) , R. Abdullah, A. ( Universiti Teknikal Malaysia Melaka (UTeM) ) , Manap, M. ( Universiti Teknikal Malaysia Melaka (UTeM) ) , Sutikno, T. ( Universitas Ahmad Dahlan (UAD) ) , Ab Ghani, M. R. ( Universiti Teknikal Malaysia Melaka (UTeM) )

Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

In this paper, spectrogram, a fast and accurate technique is introduced for the analysis of the contribution. Based on a rule-based classifier and the threshold settings that referred to the IEEE Standard 1159 2009, the analysis of the harmonic and interharmonic contribution of EAF are carried out successfully. Moreover, the impact of contribution is measured using total harmonic distortion (THD) and total non-harmonic distortion (TnHD). In addition, spectrogram also gives 100 percent correct detection and able to analyze the contribution impact. It is proven that the proposed method is accurate, fast and cost efficient for analyzing the impact of harmonic and interharmonic of EAF.

An Identification of Multiple Harmonic Sources in a Distribution System by Using Spectrogram

H. Jopri, M. ( Universiti Teknikal Malaysia Melaka (UTeM) ) , R. Abdullah, A. ( Universiti Teknikal Malaysia Melaka (UTeM) ) , Manap, M. ( Universiti Teknikal Malaysia Melaka (UTeM) ) , Sutikno, T. ( Universitas Ahmad Dahlan (UAD) ) , Ab Ghani, M. R. ( Universiti Teknikal Malaysia Melaka (UTeM) )

Bulletin of Electrical Engineering and Informatics Vol 7, No 2: June 2018
Publisher : Institute of Advanced Engineering and Science

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Abstract

The identification of multiple harmonic sources (MHS) is vital to identify the root causes and the mitigation technique for a harmonic disturbance. This paper introduces an identification technique of MHS in a power distribution system by using a time-frequency distribution (TFD) analysis known as a spectrogram. The spectrogram has advantages in term of its accuracy, a less complex algorithm, and use of low memory size compared to previous methods such as probabilistic and harmonic power flow direction. The identification of MHS is based on the significant relationship of spectral impedances, which are the fundamental impedance (Z1) and harmonic impedance (Zh) that estimate the time-frequency representation (TFR). To verify the performance of the proposed method, an IEEE test feeder with several different harmonic producing loads is simulated. It is shown that the suggested method is excellent with 100% correct identification of MHS. The method is accurate, fast and cost-efficient in the identification of MHS in power distribution arrangement.