Ahmad farid Abidin

Universiti Teknologi MARA | UiTM · Advanced Computing and Communication

The existing border distortion effect at signal edges can produce inaccurate detection of transient signals when deploying signal processing method. Therefore, there is a need to develop a technique to minimise this border distortion effect through the use of Discrete Wavelet Transform (DWT). In this study, the extension mode has been proposed to m...

Power disturbances monitoring is one of the important aspects on dealing power quality issue in electrical system. The aims of conducting monitoring process are to identify the real culprit which contribute to the Power Quality (PQ) problem. One of the vital steps during monitoring process is the classifying various type of power disturbance. This...

Deep Learning has ignited great international attention in modern artificial intelligence techniques. The method has been widely applied in many power system applications and produced promising results. A few attempts have been made to classify fault on transmission lines using various deep learning methods. However, a type of deep learning called...

The excessive Neutral-to-Earth-Voltage (NTEV) could lead to the unnecessary losses and safety hazard issue to the electrical consumer. Hence, it is a paramount need to mitigate the excessive NTEV from occurring in the system. In order to mitigate the excessive NTEV, it is very crucial to identify the source of this problem so that the proper mitiga...

span>In electrical systems nowadays, power quality issues have become a major concern for customers and electrical utilities. The high Neutral to ground (NG) voltage are one of the power quality issues which could cause adverse effect such as malfunction the devices, neutral overheating and electricity shock. Thus, the high NG voltage should be cla...

This paper presents a post-fault tolerant analysis of symmetrical six-phase induction machines under one to three open circuit faults considering maximum torque and minimum loss for different neutral connections namely single isolated and two isolated neutrals. Post-fault performance is performed based on derating factor, minimum stator copper loss...

span>Distance relay is prone to mal-operate during power swing, thus most of modern distance relay design is equipped with power swing blocking scheme to block the operation during power swing and reset the blocking operation whenever a fault occurs during power swing. However, the detection of fault during power swing especially for high resistanc...

The Neutral to Earth Voltage (NTEV) rise are categorised one of power quality (PQ) problems in the commercial building. Usually, the NTEV rise occur due to the neutral conductor problems. Theoretically, the neutral problems give an adverse effect to the network system where the phase voltage and harmonic distortion become more imbalance, heating on...

Wavelet transform (WT) is an effective method to de-noise the signal based on several attainment de-noising through wavelet threshold methods. In this study, four types threshold technique namely rigrsure, minimaxi, heursure, and sqtwolog as proposed have been tested to de-noise the signal with transient event. This study has been focusing on decom...

The aim of this paper is to evaluate the implementation of windowing-based Continuous S-Transform (CST) techniques, namely, one-cycle and half-cycle windowing with Multi-layer Perception (MLP) Neural Network classifier. Both, the techniques and classifier are used to detect and classify the Power Quality Disturbances (PQDs) into one of possible cla...

In this paper, a speech enhancement method using 2D Gabor filter is proposed. The proposed filter is used to enhance Arabic phoneme speech signals that have been recorded under control environment namely indoor room recording. All the phoneme signals are spoken by Malay speakers and considered as non-native Arabic speakers. Firstly, corrupted speec...

In this paper, a speech enhancement method using 2D Gabor filter is proposed. The proposed filter is used to enhance Arabic phoneme speech signals that have been recorded under control environment namely indoor room recording. All the phoneme signals are spoken by Malay speakers and considered as non-native Arabic speakers. Firstly, corrupted speec...

The articulation of Arabic phonemes is essential for the Malay community since Arabic language is mandatory to perform worship. Hence, in this paper, an acoustical analysis of Arabic phonemes for vowels /u/ and /u:/ is discussed based on tokens pronounced by Malay speakers. The experimental results showed that the Malay speakers are inclined to utt...

Neutral to Earth Voltage (NTEV) is one of power quality (PQ) problems in the commercial building that need to be resolved. The classification of the NTEV problems is a method to identify the source types of disturbance in alleviating the problems. This paper presents the classification of NTEV source in the commercial building which is known as the...

The enhancement of powerful signal processing tools has broadened the scope research in power quality analysis.The necessity of processing tools to compute the signals accurately without border distortion effect presence has demanded nowadays. Hence, S-Transform has been selected in this paper as a time-frequency analysis tools for power disturbanc...

p>This paper deals with border distortion effect at starting and ending of finite signal by proposing sliding window technique and basic extension mode implementation. Single phase of transient and voltage sag is chosen to be analyzed in wavelet. The signal which being used for the analysis is simulated in Matlab 2017a. Disturbance signal decompose...

This paper was conducted to detect and classify the different power quality disturbance (PQD) using Half and One-Cycle Windowing Technique (WT) based on Continuous S-Transform (CST) and Neural Network (NN). The system using 14 bus bars based on IEEE standard had been designing using MATLAB©/Simulink to provide PQD data. The datum of PQD is analyzed...

Wavelet transform is an essential method for preprocessing and analyzing non-stationary signal of power quality disturbances. Recently, power quality disturbances cause various effects which reduce the accuracy of the signal such as border distortion. This paper is presenting the comparative study on extension mode scheme to reduce border distortio...

The negative impact of power quality problem due to voltage flicker has gained a growing concern from utilities, especially in the areas of distribution planning. The EAF is observed to produce the most common severe voltage flicker in the industrial systems due to it random and stochastic characteristics. Thus, this paper has proposed a new contro...

This study presents development of real time energy monitoring system installed in Level 17, Tower 2, Engineering Complex, Universiti Teknologi MARA (UiTM), Malaysia. The device and programming uses microcontroller board Arduino, ESP8266 Wi-Fi module, sensors and Emoncms.org web server to record and display the real time power and energy consumptio...

Power Quality (PQ) problems on distribution system (DS) can be categorized as voltage sag, voltage swell, harmonic, transient and others. Nowadays, due to the nonlinear loads, imbalanced loads, improper wiring and poor grounding on DS, the neutral to earth voltage (NTEV) become issue of the PQ problem. Generally, magnitude of the NTEV is zero value...

This paper present the real time voltage sag detection and analysis using discrete and continuous wavelet transform. The real time analysis is carried out in Labview software with the aid of voltage measurement data acquisition module to display the resulting wavelet coefficient corresponding to the acquired voltage signal generated by Chroma Progr...

Economic dispatch is a crucial process conducted by the utilities to correctly determine the satisfying amount of power to be generated and distributed to the consumers. During the process, the utilities also consider pollutant emission as the consequences of fossil-fuel consumption. Fossil-fuel includes petroleum, coal, and natural gas; each has i...

Formants characteristics help to investigate the proper articulation manner of vowels. Arabic phonemes articulation based on the vowel /a:/ is addressed in this paper. The investigation based on Arabic phonemes uttered by Malay speakers. In total, 8 Malay subjects are involved to record 224 tokens of Arabic phonemes based the vowel /a:/. Each subje...

This paper presents a new technique known as Modified Firefly Algorithm (MFA) technique in solving coordination problem of Directional Overcurrent Relays (DOCRs). DOCRs coordination problem is formulated as a Mixed-Integer Non Linear Programming (MINLP) problem. MINLP requires the optimal values of Time Multiplier Setting (TMS) and the pickup curre...

Transmission lines are subjected to many kind of fault. Therefore fault location scheme is needed to determine the exact location of fault. This paper proposed a method for estimating transmission line fault location system using traveling wave method and artificial neural network (ANN). The method starts by decomposing the current signal from the...

Arabic phonemes can be categorized as voiced and voiceless with each phoneme has a different articulation manner according to the corresponding vowel. In addition, Arabic language comprises of six vowels. Hence, in this paper, a comparison within each vowel between the voiced and voiceless Arabic phonemes is conducted. The experiments are based on...

In Malaysia, Arabic language is spoken, and commonly used among the Malays. Malays use Arabic in their daily life, such as during performing worships. Hence, in this paper, some of the Arabic vowels attributes are investigated, analysed and initial findings are presented based on tokens articulated by Malay speakers as we can consider the spoken Ar...

This study was conducted in order to identify the different types of PQD based on a new approach the Analysis Of Variance (ANOVA). ANOVA is used as feature selection for the Power Quality Disturbances (PQD) parameters. The datum of PQD from the PSCAD/EMTDC® simulation has been validated before feature extraction analysis can be commenced. The obtai...

Emission dispatching is conducted to calculate the lowest amount of emission while generating satisfying output to the load demand. The utilities are restricted by emission regulation that limits the emission level to a certain amount. This paper proposes emission dispatch with multiple fuel option (EDMFO) to determine the optimal emission level. T...

2015 IEEE 11th International Colloquium on Signal Processing & its Applications (CSPA2015), 6 -8 Mac. 2015, Kuala Lumpur, Malaysia

This paper was conducted in order to identify and classify the different types of Power Quality Disturbances (PQD) based on a new approach the Analysis Of Variance (ANOVA). ANOVA is used as feature selection for the PQD parameters. The datum of PQD from the PSCAD/EMTDC® simulation and Power Quality Monitoring has been validated before feature extra...

Speech recognition techniques for Arabic language are still in its infant stage and gain much attention recently. This is due to Arabic as the language of the Holy book of Muslims; hence it has attracted attention of native speakers and other Muslims who are non-native Arabic speakers as they need to use Arabic language while performing worships. T...

The presence of Distributed Generation (DG) System with the impact to the power swing during the instability was revealed. Some of the scenario which affect to the Zone Protection of Distance Relay has been observed. The result shows that the apparent impedance was passes through both the Zone 1 and Zone 2 of protection of distance relay during ins...

This paper presents a new approach known as Modified Swarm Firefly Algorithm (MSFA) technique in solving Directional Overcurrent Relays (DOCRs) coordination problem by minimizing the operating time of primary relays at near-end fault. DOCRs coordination requires the optimal values of Time Multiplier Setting (TMS) whereas the pickup current (Ip) val...

The selection of the proper feature extraction method is an essential issue for any Automatic Speech Recognition system. This has been conducted in order to choose the suitable feature extraction method for Arabic phoneme recognition system based Malay speakers. In this paper, the implementation of three feature extraction methods involves Frequenc...

Arabic language is used as a second language by a wide category of Muslims for reciting the Holy book of Muslims (Qur'an). The continuous Arabic phonemes corpus adds more challenges to the Automatic Speech Recognition system by paying more efforts in order to determine the start and end points for each phoneme. In addition, looking for a similar ph...

This paper describe the effect of adding fillers into polymer for dielectric properties improvement. Two types of untreated phyllosilicate fillers which are MMT and FC selected to be used in order to strengthen HDPE, SIR and NR properties. The dielectric properties of three materials were observed from Tan Delta and breakdown strength. Based on the...

Economic load dispatch is the process of computing the operating cost of a power system. The cost is directly associated with the price of fuel consumed by the system's generators. In order to obtain the best operating cost, the generators are fed with different type of fuel according to the output power. Previously, piecewise selection technique w...

Computational intelligence method such as Nature Inspired Algorithms (NIA) or meta-heuristic algorithms based optimization methods known to be successful in coordination of directional overcurrent relay. It has also been reported that it outperformed the conventional approach. Due to its advantages, it has gained more popularity among the researche...

Distance relay design is equippedwith out-of-step tripping scheme to ensure correct distance relay operation during power swing. The out-of-step condition is a consequence result from unstable power swing. It requires proper detection of power swing to initiate a tripping signal followed by separation of unstable part from the entire power system....

This paper presents the implementation of Artificial Bees Colony (ABC) algorithm in solving Directional OverCurrent Relays (DOCRs) coordination problem for near-end faults occurring in fixed network topology. The coordination optimization of DOCRs is formulated as linear programming (LP) problem. The objective function is introduced to minimize the...

In this paper, the new demodulation method based on Enhanced Phase-Locked Loop (EPLL) method for flicker power algorithm is proposed. This technique has capability to detect a specific flicker component on input signal and extract flicker envelope without producing a double frequency ripple and new significant low frequency. The IEEE 13 bus distrib...

This paper presents the implementation of Modified Swarm Firefly Algorithm (MSFA) technique which considers the effect of population size in solving directional overcurrent relay coordination problem. The coordination of directional overcurrent relays is formulated as linear programming problem and the proposed technique is compared with those obta...

Flicker Power Algorithm has been found to be acceptable techniques for flicker source identification in power system. It is due to the scheme of this algorithm that follows the acceptable IEEE Flicker Meter standard. However, these Flicker Power Algorithm techniques are facing the deficiency due the inaccurate flicker power calculation. In this pap...

In energy industry, generating the correct amount of electrical power is crucial. Economic load dispatch is used to compute the necessary amount of power among the generators. However, each generator in a system is limited by its physical properties that will limit its maximum potential. This prohibited zone divides the actual operation limits of a...

This paper presents a simple, consistent and reliable technique to identify detected partial discharges (PD) using an acoustic ultrasonic method. A new reliable algorithm named 'Simple Partial Discharge Identifier' (SPDI) is proposed to perform identification process of the detected ultrasonic signals of PD. Experimental works based on recommended...

Emission dispatch deals with the process of determining the emission level produced by thermal power plants. Since the concerns toward environmental health paramount, emission dispatch has become a crucial consideration during energy dispatch planning. Different fuel types produce different types of pollutant and thus the total emission level may v...

This paper presents an intelligent approach for detecting power swing for distance relay operation. The proposed scheme uses time-frequency transform known S-Transform for feature extraction. It is based on S-Transform analysis on the active power measured at distance relay point in transmission line. The proposed scheme overcomes the traditional r...

The genesis of this research work was constituted for the issue of classifying the characteristics of harmonics caused by partial discharge (PD). This work was undertaken based on the hypothesis that the characteristics of the harmonic orders caused by different types of Partial Discharge (PD) can be classified. Experimental work was initially perf...

Distance relay is designed to block the tripping operation during a power swing. However, if a fault occurs during a power swing, it should be detected and unblocking function should be evoked to clear the fault as soon as possible. Fault detection during a power swing poses a challenging task. This paper presents an intelligent approach to detect...

This paper presents Particle Swarm Optimization (PSO) for overcurrent relay coordination problem. PSO is proposed to solve miscoordination problems and the objective function is to minimize the operation time of the relays. The efficiency of the proposed technique is compared with those obtained using Genetic Algorithm (GA). The algorithms have bee...

Arabic language is used as a second language by a wide category of Muslims for reciting the Holy book of Muslims (Qur'an). In this paper, a description of an effective and usable Arabic letters corpus uttered by Malay speakers. This corpus can be used to study the properties and the differences of pronunciations for non native. The designed corpus...

Phenomenon of power swing in power system will cause inclusive shutdown or power failure within industry that also have been endured with massive economical losses. Power swing causes immense oscillations in active and reactive power, low voltage, voltage instability and phase or angular instability between the generated and consumed power. These i...

Voltage flicker measurement methods become significantly important nowadays with increasing uses of the sensitive loads. Flicker Power algorithm has been found to be acceptable techniques for determining the flicker source direction in power system since it construction follow the IEEE flickermeter standard. However, these Flicker Power algorithm t...

Emission dispatch is a topic that discusses on the discharge of polluting substance by fossil-fuelled generators. The arising concerns towards environmental quality arouse new trend in power flow studies. Emission dispatch has become a vital consideration during load dispatch scheduling and the power utilities are urged to reduce the pollutant volu...

Unit commitment is among of the key elements in power system planning. Unit commitment is extensively applied by the power utilities to plan the optimal dispatch of generating units in the system. In the deregulated power system industry, it is important to consider several uncertainty constraints during the planning process. This research proposes...

Voltage flicker is one of the most significant disturbances in electrical distribution power systems. An electric arc furnace is considering as one of the major source of voltage flicker due to it an unbalanced, nonlinear and time-varying characteristic. Distribution Synchronous static compensator (D-STATCOM) has been proved to be more efficient an...

Vast development in power electronics since the last decade has lead to applications of electric drives with phase number greater than three especially in locomotive, naval, aerospace, and electrical vehicles industry. Multi-phase electric drives offer great number of advantages compared to three-phase electric drives but multi-phase drives produce...