bluuebunny/crossref_metadata_2025 huggingface dataset:
Gravitational Search Algorithm Based Technique for Voltage Stability Improvement
Authors: Mohamad Zamani Mohamad Khairuzzaman , Musirin Ismail , Sabri Omar Mohamad , Izwan Suliman Saiful , Md. Ghani Nor Azura , Mohamed Kamari Nur Azwan
Published: January 2019

Voltage instability problem has been known as a significant threat to power system operation since its occurrence can lead to power interruption. This phenomenon can be due to uncontrollable load increment, line and generator outage contingencies or unplanned load curtailment. Optimal reactive power dispatch involving reactive power support can be one of the options for improving voltage stability of a power system, which also requires optimization process. Optimal sizing and location can of reactive power support can avoid the system from experiencing over-compensated or under-compensated phenomena. The presence of optimization techniques has helped solving non-optimal phenomenon, nevertheless some setbacks have also been experienced in terms of inaccuracy and stuck in local optima. This paper presents the application of Gravitational Search Algorithm (GSA) technique in attempt to solve optimal reactive power dispatch problem in terms of reactive power support for voltage stability improvement. Optimization process tested on IEEE 14-bus Reliability Test System (RTS) has revealed its superiority with significant promising results in terms of voltage stability improvement in the test system. 
Leaf Recognition using Texture Features for Herbal Plant Identification
Authors: Ibrahim Zaidah , Sabri Nurbaity , Abu Mangshor Nur Nabilah
Published: January 2019

This research investigates the application of texture features for leaf recognition for herbal plant identification.  Malaysia is rich with herbal plants but not many people can identify them and know about their uses.   Preservation of the knowledge of these herb plants is important since it enables the general public to gain useful knowledge which they can apply whenever necessary.  Leaf image is chosen for plant recognition since it is available and visible all the time.   Unlike flowers that are not always available or roots that are not visible and not easy to obtain, leaf is the most abundant type of data available in botanical reference collections.  A comparative study has been conducted among three popular texture features that are Histogram of Oriented Gradients (HOG), Local Binary Pattern (LBP) and Speeded-Up Robust Features (SURF) with multiclass Support Vector Machine (SVM) classifier.  A new leaf dataset has been constructed from ten different herb plants.  Experimental results using the new constructed dataset and Flavia, an existing dataset, indicate that HOG and LBP produce similar leaf recognition performance and they are better than SURF.
Investigating Thermal Comfort for the Classroom Environment using IoT
Authors: Idura Ramli Nurshahrily , Mohamed Rawi Mohd Izani , Zahid Hijazi Ahmad , Kunji Mohammed Abdullah Hayyan
Published: January 2019

In this modern century where fine comfort is a necessity especially in buildings and occupied space, the study to satisfy one aspect of human comfort is a must. This study encompasses of exploring the physiological and environmental factors in achieving thermal comfort which specifically considering the clothing insulation and metabolic rate of students as well as the deployment of dry-bulb temperature, mean radiant temperature, humidity, and air movement in order to obtain the level of comfort students are experiencing in class. The level of comfort are detected by using ASHRAE 55 to determine the average thermal sensation response through the Predicted Mean Vote (PMV) value. An android application were developed to read input of recognizing clothing level (thickness of clothing) and capturing metabolic rate to cater the inputs for physiological factors, while radiant temperature, humidity and air movement are captured through static sensors set up in the classroom space. This paper analyses both the physiological and environmental factors in affecting students in class and further determine their comfort levels that is a major influencing factor of focus in learning. Through cross referencing collected data from IoT enabled nodes, it is found that both physiological and environmental factors, and the combination of them greatly influence in getting the most comfortable state with PMV value of 0.
Identifying the Breakdown Voltages of Vegetable Oils with Silicone Carbide Nanoparticle Additive as Insulating Oil for Transformers
Authors: Yahya Muhammad bin , Najihah binti Maliki Nurul Aifaa
Published: January 2019

This paper discusses on the breakdown voltage of vegetable oils with nanoparticles added to be used as insulating oil for transformers. Raw samples of Palm Oil (PO) and Coconut Oil (CO) were used in this research. Different percentages of silicone carbide (SiC) nanoparticles was added into the samples of the vegetable oils. The different parameters of the vegetable oil mixtures were investigated through the breakdown voltage tests to analyse the effect of the additive on the dielectric strength of the oils. The performance of insulating oils varies according to the percentage of nanoparticles added through viscosity test and partial discharge (PD) measurement. The initial results for vegetable oils showed that the percentage of additives influenced the value of breakdown voltage of the oils highly. Furthermore, the result shows that PD measured became very low after the addition of silicone carbide nanoparticles.
Natural Dyes from Roselle Flower as a Sensitizer in Dye-Sensitized Solar Cell (DSSC)
Authors: Suriani Dayang , Misrun Muhammad Irwanto , Nair Gomesh , Ismail Baharuddin
Published: January 2019

Hibiscus Sabdariffa L. well known as Roselle flower was used as sensitizers for Dye-Sensitized Solar Cell (DSSC). The dyes were extracted using distilled water (DI) and ethanol (E) extract solvent in an ultrasonic cleaner for 30 minutes with a frequency of 37 Hz by using ‘degas’ mode at the temperature of 30°. Doctor blade method was applied in the fabrication of titanium dioxide (TiO2) on ITO glass. Absorption spectra of Roselle dye with different extract solvent were tested using Evolution 201 UV-Vis Spectrophotometer. Fourier-Transform Infrared (FTIR) was used to identify the functional active group in extract dye. Based on FTIR result, the broad absorption at peak 2889 cm-1, 2976 cm-1, and 3366 cm-1 attributed to the O-H stretching which is the presence of hydroxyl group. The use Field Emission Scanning Electron Microscopy (FESEM) and Energy-Dispersive Spectroscopy (EDS) analysis are to characterize the surface morphology and element in the TiO2 thin film.
A Photo Voltaic Source Fed Novel Boosting Switched Z-Source Multilevel Inverter
Authors: KJ Sinu , Ranganathan G.
Published: January 2019

This paper presents a new switched z-source multilevel inverter powered from a photovoltaic source. Addition of a power electronic switch in conventional z-source network provides excellent voltage boosting capability with moderate power rating which makes it suitable for low voltage photo voltaic applications. Proposed topology consists of single dc source, six power switches, two diodes, four capacitors and two inductors comparing to conventional five level schemes proposed topology contains less number of switches and passive elements. This scheme produces voltage waveform with lesser harmonics and shows lesser THD percentage by using different modulation index of multi carrier level shifted PWM technique. Proposed switched z-source multilevel inverter is implemented using MATLAB software and results are presented to verify merits of the scheme. 
Codesign Methodology based FPGA and Embedded Linux for Motor Control
Authors: Jaziri Ibtihel , Charaabi Lotfi , Jelassi Khaled
Published: January 2019

Recently, the complexity of the embedded electrical systems is increasing due to the growing of industrial necessities. To handle with this complexity, the use of reconfigurable hardware/software codesign methodology using digital platforms becomes necessary. Reconfigurable methodology can be seen as an essential feature in motor control systems as it offers many advantages such as increased flexibility, low energy consumption. In these kind of systems, both hardware and software designs can be reconfigurated depending upon the designer requirements. This paper presents hardware/software codesign methodology with flexible hardware devices and configurable graphical user interface: the hardware architecture is based on field-programmable gate array and the software architecture is based on embedded Linux operating system running on Beaglebone. The user interface is designed as a graphical user interface developed on an emebdded server; this enables the user to access to the system rapidly, parameterize and observe the behavior of the controller.
Parallelization of Pairwise Alignment and Neighbor-Joining Algorithm in Progressive Multiple Sequence Alignment
Authors: Utomo Agung Widyo
Published: January 2019

Progressive multiple sequence alignment ClustalW is a widely used heuristic method for computing multiple sequence alignment (MSA). It has three stages: distance matrix computation using pairwise alignment, guide tree reconstruction using neighbor-joining and progressive alignment. To accelerate computing for large data, the progressive MSA algorithm needs to be parallelized. This research aims to identify, decompose and implement the pairwise alignment and neighbor-joining in progressive MSA using message passing, shared memory and hybrid programming model in the computer cluster. The experimental results obtained shared memory programming model as the best scenario implementation with speed up up to 12 times.
A Smart Method for Monitoring and Scheming Of Road Luminosity Using GSM Equipment
Authors: G Ravichandran , M Krishnamurthy
Published: January 2019

In our modern life, energy wastage in Streetlight is a big problem faced in walkways and roads during dawn and dusk. These days, the present road light structures are wired which are hard to make and has poor adaptability. During the daytime, the battery gets charged by sun rays, and the energy can be used to power the road lights at night time. The structure regards sun situated cell foundation. It is like manner delineates the usage of remote sensor frameworks using GSM for streetlight checking and control. This system would give remote access to streetlight upkeep and monitoring. It likewise talks about a perceptive framework that takes programmed choices for sparkling control (ON/OFF/DIMMING) considering encompassing light power and time both at a similar minute. The data collected from the sensor is given to the microcontroller of one unit, and at the same time, the SMS is sent through GSM to the Raspberry PI microcontroller to monitor and control the street light.
A Study about SOA Based Agriculture Management Data Framework
Authors: Moorthi N Prasanna , Mathivananr Mathivananr
Published: January 2019

Agricultural MDF is a sort of data framework concentrating on the agricultural generation, administration, logical research data gathering, ordering, arranging, recovery and yield; it is an imperative piece of the farming informatization. In view of the examination of circumstance and issue of rural data management, this paper give a coordination model of utilizing SOA to outline agrarian MDF. The SOA's hypothesis, execute innovation and application structure and character were talked about in detail. In light of the investigation of necessity is meaning of agrarian MDF. Utilizing the planning thought of SOA, based-SOA farming MDF was presented, and the fundamental idea, model of configuration was talked about in points of interest.
A View on Creep Failure in Distribution Transformers
Authors: Elavarasi R.
Published: January 2019

This paper insight about reasons of disappointment in distribution transformers. It has been suggested that crawl may be a noteworthy purpose behind such disappointments. The impact of anxiety, temperature, and material on unfaltering state killjoy rate on aluminum and copper wires (utilized as a part of 25 KVA distribution transformers) have been introduced. Proposed study affirms that the disappointment rate of aluminum wound DTs is higher than the disappointment rate of copper injury DTs in force insufficient ranges and poor conveyance systems. The higher disappointment rate of aluminum wound DTs has been credited to the lifted enduring state wet blanket rate of the aluminum wire than copper wire.
Chaos Based Image Encryption
Authors: G. B Suresh. , Mathivanan V.
Published: January 2019

New method of secure image encryption and decryption scheme based on the chaos is proposed. There are two steps are followed after the preprocessing step in the proposed system namely, Encryption and Decryption. In preprocessing, images are denoised using median filter. Then the original input images will be encrypted by using the chaos mapping algorithm. At last the original images are retrieved back from the encrypted image by using the key that is specified during the encryption process for the decryption of the original images. Then the histogram mapping is done for the encrypted and the decrypted images. The proposed system is tested on well-known images like Lena, Mandrill, Clown and Barbara. The experimental results have demonstrated that the introduced image encryption scheme can achieve high security for practical image encryption.
Cascaded Ripple Carry Adder Based SRCSA for Efficient FIR Filter
Authors: Ali Mohamed Syed
Published: January 2019

Filter is one of the key components of all signals processing elements. Both the FIR and IIR filter are used to reduce the unwanted signal in the original signal. Here discussing the FIR filter and design the efficient FIR filter using Dual Ripple Carry Adder (RCA) based SQRT-carry select adder (CSLA). Many components present in the FIR filter, one of the main component is Adder. Adder is used to combine the signal for avoid the noise occurring in the output. Proposed a Dual RCA based SQRT-CSLA for speed up the filtering process. The filter performance can be analyzed by Xilinx simulation environment.
E-Carnet Resumption and Repository System for Bus Line Commuters
Authors: V Sujatha , Anitha E.A. Mary
Published: January 2019

E-Carnet Resumption and Repository System for Bus Line Commuters is an ongoing venture which is very useful for the passengers. Resumption can be done using any two id proof and using credit card for paying money. This online bus pass Resumption application will help people to save their time and repository the bus passes without standing in a line for hours near counters. At first individuals need to enlist with the application by submitting points of interest of photograph, address proof, any two id verification and required subtle elements and submit through on the web. The application will verify the details and if all proves are verified then followed by transaction will be held. After that the pass will automatically generating and send it through mail. You can even repository using credit card or wire transfer methods.  This system can be used in bus transport undertaking services. Using the system in government and private sectors can exclude the use of human efforts and saves lot of money and time. This system also used to finding the route for Different places. The route information updates admin control so user trusts the valid paths. User locations are tracking using GPS tracker.
Efficient Data Assumption and Optimization of Analog Response Communication Systems
Authors: N Prasanna Moorthi , Mathivanan V
Published: January 2019

This paper is focused on the examination of connection between the premier remote reason exactitude of transmission information and qualities for driving edge correspondence structures and straightforward data cesium (AFCS) identified with transmission of signs from fundamental sources. It's displayed that the mean sq. oversight of transmission picks information properties of AFCS. Varieties between the cutoff purposes of AFCS thought of as summed up correspondence channel and their forward channel square measure investigated. The new impacts appearing in incredible AFCS and in DCS working near Shannon's cutoff square measure thought of also. Amid this works advanced and essential correspondence frameworks were thought of with none inclinations and no confirmation that the use of simple cesium is frequently less able than modernized correspondence structures had been given start inside the no in this way far off past. The secured comes about unambiguously showed the capacity of simple data cesium to transmit the signs while not committal to composing with to a little degree rate up to the uttermost ranges of the forward control.
Active and Reactive Power Scheduling Optimization using Firefly Algorithm to Improve Voltage Stability under Load Demand Variation
Authors: Mohamad Zamani Mohamad Khairuzzaman , Musirin Ismail , Hassan Halim , Shaaya Sharifah Azwa , Sulaiman Shahril Irwan , Ghani Nor Azura Md. , Suliman Saiful Izwan
Published: January 2019

This paper presents active and reactive power scheduling using firefly algorithm (FA) to improve voltage stability under load demand variation. The study involves the development of firefly optimization engine for power scheduling process involving the active and reactive power for wind generator. The scheduling optimization of wind generator is tested by using IEEE 30-Bus Reliability Test System (RTS). Voltage stability of the system is assessed based in a pre-developed voltage stability indicator termed as fast voltage stability index (FVSI). This study also considers the effects on the loss and voltage profile of the system resulted from the optimization, where the FVSI value at the observed line, minimum voltage of the system and loss were monitored during the load increment. Results obtained from the study are convincing in addressing the scheduling of power in wind generator. Implementation of FA approach to solve power scheduling revealed its flexibility and feasible for solving larger system within different objective functions.This paper presents active and reactive power scheduling using firefly algorithm (FA) to improve voltage stability under load demand variation. The study involves the development of firefly optimization engine for power scheduling process involving the active and reactive power for wind generator. The scheduling optimization of wind generator is tested by using IEEE 30-Bus Reliability Test System (RTS). Voltage stability of the system is assessed based in a pre-developed voltage stability indicator termed as fast voltage stability index (FVSI). This study also considers the effects on the loss and voltage profile of the system resulted from the optimization, where the FVSI value at the observed line, minimum voltage of the system and loss were monitored during the load increment. Results obtained from the study are convincing in addressing the scheduling of power in wind generator. Implementation of FA approach to solve power scheduling revealed its flexibility and feasible for solving larger system within different objective functions.
Alternative Methods for Forecasting Variations in Hospital Bed Admission
Authors: Shariff S. Sarifah Radiah , Suhaimi Mohd Azuan , Zahari Siti Meriam , Derasit Zuraidah
Published: January 2019

The Malaysian healthcare system is well-being recognized for providing a wide range of access to primary healthcare. The number of hospitals is found to be growing in line with the increase in population. However, over-crowding has become the most common scene that people see in every hospital. The number of  patients being admitted may  somehow  mislead  healthcare planners,  and  thus  causing  them  to  underestimate  the  resources  that  are  required  within  the  hospital. Thus, this study aims to identify better forecasting models for variations in hospital bed admission considering State Space Model (SSM). Data on the admission rate of a state hospital was collected, spanning the period of historical data from 2001 until 2015. The findings indicate that State Space model can outperform common model due to its lower Mean Squared Errors. Female aged between 25 -34 years old are found to be having the highest variation, which could lead to unpredictable in terms of being admitted to hospital.
Gaze Tracking Algorithm Using Night Vision Camera
Authors: Izzuddin T.A. , Jali M.H. , Abdullah A.R. , Sudirman R.
Published: January 2019

Nowadays, the advancement of medical technology has given birth into many innovative machines and devices to improve our health life, especially to those who are disabled or gifted.   On some people with severe disabilities such as quadriplegia, the human eye-ball does not only serve as a vision system, but also a means of conveying information and intention to other people. This is because although quadriplegic patients suffer the loss of motor sensory functions from the neck and below, upper neck functions such as the vision system is normally spared. This enables the patient to control the movement of his/her eyeballs to convey desired information. Although many similar researches have been done, this paper proposes the use of image processing on image captured using webcam with its Infra-Red (IR) filter removed (a.k.a night vision) to achieve robustness. This allows the algorithm to properly track the location of the iris despite of its and the pupil color variations. Two image processing algorithms are then used, each with owns tradeoff between speed and accuracy.  Analysis on both algorithms shows good tracking performance despite of the mentioned tradeoff.
Near Field Communication Based Digital Transaction Card
Authors: Ravichandran Ravichandran , Krishnamurthy M.
Published: January 2019

Our paper aim is to design a reprogrammable smart payment card that replaces all other cards in the wallet assembled using an ultra-low power e-paper display, Bluetooth Communication, capacitive touch sensor and NFC. The controllers used in this project based on ARM Cortex-M architecture. The main advantage of this paper is the card will be in constant communication with the smartphone. In case if the connection was lost, after a certain time interval the card interprets it as lost or stolen and will automatically disable itself. The user can re-enable the card only by entering the authentication password on the card and from the smartphone app.
Prospect Convenient Steadfast Procedure in Wireless Sensor Network
Authors: Singh Jewan , Mansotra Vibhakar
Published: January 2019

This article objective is to improve the steadfast routing in Wireless Sensor Networks with little interfering and avoid packet collision. In the scheme, the entire node has the option of electing next Data Communication Node (DCN). The next data communication node is chosen depend on the intensity of link, remaining energy, and the node with distance towards the Base Station. Thus, the sender node transmits the information to the best DCN. Instantly, the DCN sends the acknowledgement (ACK) along with the number of packets received back to the node from which it obtains the data. The sender node assures the delivery of the transmitted packets by comparing the value of number of packets sent with the value obtained with the acknowledgement. If they are equivalent, it will send the verification identity to the DCN. If it is not equivalent, it will decide another node with highest link intensity. After that, the data chooses the DCN and repeat the process until the data reaches the Base Station.
Protection Of Sequence and Communication Technology Equipment Using Smart Grid Application
Authors: J Archenaa , Anitha E. A. Mary
Published: January 2019

This paper investigates the merger of energy utility circuits with that of the data and correspondence innovation (ICT) gear under the keen matrix and the security suggestions that this postures, and figures out what is the most extreme voltage that ICT hardware, composed as per IEC 62368-1 can specifically get to control framework circuits. The coming of the keen lattice, the modernization of the power framework utilizing current data and correspondence innovation methods, alongside the expansion of electric vehicle frameworks to the matrix, guarantees to change the business in uncommon manners. In this paper will be utilized as a part of this paper for deciding the level of security of ICT gear must be built to keeping in mind the end goal to be conveyed in higher-voltage application.
Architecting Virality: Information Sharing from Government FB Page to Netizens
Authors: Fathiyah Harun Afdallyna , Aqmaar Adzman Siti Nuradzarul , Mohd Saman Fauzi , Izwan Suliman Saiful
Published: January 2019

In accordance with e-government initiatives, many ministries in Malaysia have engaged content to public using social media for better two-way communications. However, creating an online presence is not necessarily easy as digital content consumers are often bombarded with information and those that fail to capture information will be rendered uninteresting and irrelevant. This is imperative as for most part, users are in control of where they allocate attention and what they share. Using virality as a context, it is opined that information content that are well-designed will trigger specific information and propel the sharing of that information over the Internet. A study employing FB post categorization and sharing motivations survey was carried out in the context of Ministry of Health Malaysia Facebook page. The findings show that users are inclined towards Infographics with various sharing motivations. The results can be used by Malaysian ministries on how best to design and disseminate information for the benefit of the netizens on social media sites.
A Simplified PWM Technique for Reduced Switch Count Multilevel Inverter
Authors: Ramesh, Adireddy , Sekhar O. Chandra , Kumar M. Siva
Published: January 2019

Penetration of multilevel inverters (MLI) in to high power and medium voltage application has been increasing because of its advantages. The conventional two levels inverter has high harmonic distortion which gives poor power quality. Lot of topologies has been developed to overcome the drawbacks of a two level inverter. These topologies include more number of switching devices which increases the design complexity and cost. The optimum design of inverter requires less number of switches with better quality in waveform. In this paper, a symmetrical five level and seven levels inverter configuration with simplified pulse width modulation technique is proposed. This proposed inverter requires less switches, less protection circuits along with low cost and size. The analysis of the inverter circuits is done by using Matlab/Simulink software. The synthesized staircase wave form is shown and total harmonic distortion (THD) is also measured.
Improving Performance of DOM in Semi-structured Data Extraction using WEIDJ Model
Authors: Ahmad Sabri Ily Amalina , Man Mustafa
Published: January 2019

Web data extraction is the process of extracting user required information from web page. The information consists of semi-structured data not in structured format. The extraction data involves the web documents in html format. Nowadays, most people uses web data extractors because the extraction involve large information which makes the process of manual information extraction takes time and complicated. We present in this paper WEIDJ approach to extract images from the web, whose goal is to harvest images as object from template-based html pages. The WEIDJ (Web Extraction Image using DOM (Document Object Model) and JSON (JavaScript Object Notation)) applies DOM theory in order to build the structure and JSON as environment of programming. The extraction process leverages both the input of web address and the structure of extraction. Then, WEIDJ splits DOM tree into small subtrees and applies searching algorithm by visual blocks for each web page to find images. Our approach focus on three level of extraction; single web page, multiple web page and the whole web page. Extensive experiments on several biodiversity web pages has been done to show the comparison time performance between image extraction using DOM, JSON and WEIDJ for single web page. The experimental results advocate via our model, WEIDJ image extraction can be done fast and effectively.
A Comprehensive Study and Analysis of LEACH and HEED Routing Protocols for Wireless Sensor Networks – With Suggestion for Improvements
Authors: Anitha G. , Vijayakumari V. , Thangavelu S.
Published: January 2019

The main interesting aspect of the digital era is the widely spread ease of communication from one end of the world to the other end of the world. There is a revolution in communication, digitalization, globalization, video calling, wireless data transfer and this is possible due to networking. Initially computer networks is the data sharing where data such as documents, file, reports, presentation files, videos, images etc can be shared within a local network or remotely connected networks. Traditional data networking is to empower end-to-end information transfer. The data in such networks are carried across point-to-point links and the intermediate nodes just forward the packets, where the payload of the packets is not modified. Traditional LANs need wires, which may be difficult to set up in some situations.

It is very much understandable and clearly visible that wired communication is being completely overtaken by wireless technologies in the recent past. Wireless LANs, by its very nature, empowers with increased mobility and flexibility. Wi-Fi devices get connected to the internet through WLAN and access points. 2.4 GHz and 5 GHz ISM bands are used by Wi-Fi. Also, it is to be understood that, a wireless adhoc network is distributed in its nature. It is also to be noted that, the adhoc nature makes these network to rely on any of the pre-existing infrastructure. The data forwarding shall happen from the nodes very much dynamically based on the connectivity and the routing algorithm used.  
Comparison of the different controlling techniques for buck converter in LED application
Authors: DV Shwetha , S. Paragond Lakshman Rao
Published: January 2019

This paper recounts the design and construction of various controlling techniques for buck converter. If the designed controller for any converter is not proper which leads to high overshoot and steady state error, and its dynamic response varies with changes in load, especially at high load current conditions. The lead-lag controller for the converter  is desgined using classical control theory ,Bode Plot technique is used to examine the stability of the system.By using deravetive part of the PID controller on output signal instead of voltage error signal,this combination of control technique reduces the overshoot and settling time,and how the transient response will be affected if deravetive controller is in the forward path.
Analysis of series/parallel multilevel inverter with symmetrical and asymmetrical configurations
Authors: Nagaraju Motaparthi , Kumar Malligunta Kiran
Published: January 2019

Usage of high power and medium voltage applications in domestic and industrial purpose has been increased in the recent years. Also, the penetration of renewable energy sources is increasing rapidly. To make use the renewable energy sources there is a need of using inverters. The basic inverter is conventional two level inverter which produces the square wave output voltage. The major drawback of conventional inverter is it contains more harmonics. Therefore, multilevel inverters have been introduced with staircase output voltage waveform. Lot of multilevel inverter topologies have been developed and cascaded H bridge type is the more frequently used. But, it requires more number of switches for higher output voltage level. In this paper, a novel 7 level asymmetrical multilevel inverter topology is proposed with less number of switches. This proposed topology is compared with already existing topology. The simulation of circuit and result analysis of the circuit is carried out by using Matlab/simulink software. The comparison between existing topology and proposed topology is given. The results are discussed and presented.
Performance analysis of DC/DC bidirectional converter with sliding mode and pi controller
Authors: Purohit Chandra Shekher , M. Geetha , Sanjeevikumar Padmanaban , Kiran Maroti Pandav , Swami Shruti , Ramachandaramurthy Vigna K.
Published: January 2019

A sliding mode controller for a non-isolated DC/DC, bidirectional converter is presented and comparative study with PI controller is done along with ISE analysis, in order to do performance analysis. The proposed system can be utilized in many applications such as electrical vehicle, distributed power generation or small grids. Second theorem of Lyapunov is utilized and stability of the closed loop system is mathematically proven. The adopted control strategy achieves effective output voltage regulation and good dynamic stability. Rejection of disturbance is also an inherent characteristic of this technique. Furthermore, it is illustrated that the system can successfully follow changes of load demand and compensates sudden disturbances in operating condition. The design is evaluated and verified using Matlab/Simulink. Results of Matlab simulation are provided to show the feasibility of the proposed system and effectiveness of control method. Simulation results show that this technique can provide a considerable edge over control techniques which are presently available (applied) over this type of converter.
Implementation of quasi-z source inverter for grid connected PV based charging station of electric vehicle
Authors: Sattianadan D , Saravanan K , Murugan S. , Hari N. , Venkadesh P.
Published: January 2019

In recent trends, the use of electric vehicles is taking a sudden hike as they seem to be a much more friendly for the environment as compared to the conventional vehicles that run on combustion engines for a mode of transportation. With the increasing popularity of electric vehicles, the demand on the utility grid is also increasing. To overcome this problem, other alternative sources of energy need to be considered. Photovoltaic energy as the solution is finding its place in the EV charging systems. However, the total amount of energy that can be generated from the PV system is constrained, based on many parameters such as solar radiation, availability of space for Solar power plant development, maintenance of the system, etc. Hence, to maintain the continuity of the system, it needs to be integrated with the grid as well. This offers a smooth charging operation for the electric vehicles. In this paper, a new method is introduced for the integration between the solar inverter system and the utility transmission grid. Quasi-Z-source topology is proposed for the system integration. This topology facilitates a bidirectional flow of power between the PV source, the storage unit and the utility grid. The greatest advantage of this topology is its flexibility with different voltage levels of the solar inverter DC connection and the storage battery which requires no circuit alteration for charging batteries of different ratings. The hardware for the system is also fabricated. The results demonstrate that the proposed topology fits the generalized requirements.
Analysis of High Voltage High Power Resonant Converters
Authors: C Bhuvaneswari , Rajesh Babu R. Samuel
Published: January 2019

Various Resonant Converters for high voltage and high power applications have been designed. Different Topologies of LLC, LCC, and CLL Resonant Converters have been simulated and compared for the same input voltage. The simulation was done at a very high frequency. The Output Power and the Efficiency of all the three Resonant Converters were calculated.With the results, it has been proved that LCC Resonant Converters were very much suited to give an output voltage of around 62 Kilovolts with a output power of 20 kilowatts.
A New Structure of the Nine Level Inverter Used as Active Power Filter with a Reduced Number of Swiches
Authors: Chouaf Fethi , Saad Salah
Published: January 2019

In the scope of this work, a new structure of the nine level inverter is proposed using a reduced number of power switches. This inverter is used as a shunt active power filter to compensate harmonic currents and the reactive power. The modeling and simulation of the proposed model were carried out in Matlab/Simulink environment. The simulation results show that the filtering performances were achieved despite the reduction of the switches number. It was found that the current waveform becomes purely sinusoidal with a reduction in the harmonic distortion rate (THD) to 2.68%. This implies good compensation of both harmonics and reactive power with a power factor closer to unity. Reducing the switches number allows reducing the switching losses and lowering the duration of the applied voltage supported by the semiconductors. The proposed topology also allows to get simple structure of the inverter with a reduced cost.
The Dimensioning of a Compressed Air Motor Dedicated to a Compressed Air Storage System
Authors: Rais Ilham , Mahmoudi Hassane
Published: January 2019

Storage represents the key to the penetration of renewable energies especially wind and solar energy on the network electric. It avoids unloading in the event of overproduction, ensuring real-time The production-consumption balance and also improve the robustness of the electricity grid. CAES (Compressed Air Energy Storage) is a mature technology that allows to store long or short duration an amount of energy sucient to support the number of cycles requested. The E-PV-CAES system will be presented and the modeling of the compressed air engine will also be treated in more detail in this article.
Robust Control of Doubly Fed Induction Generator Using Fractional Order Control
Authors: Azza Abdelaziz , Kherfane Hamid
Published: January 2019

In this paper, we present a robust control of a variable speed Doubly Fed Induction Generator (DFIG)-based Wind Energy Conversion System (WECS), using Fractional Order Control (FOC) to prevent system deterioration under different critical conditions (external disturbance, measurement noise and DFIG parameters variation). In order to extract the maximum power from the wind, a Maximum Power Point Tracking (MPPT) strategy based on rotor speed control is proposed. Furthermore, a vector control strategy is used for controlling active and reactive powers of DFIG. Additionally, a simple design method of Fractional Order Proportional Integral (FOPI) controller is proposed. Finally, the system’s performance is tested and compared according to reference tracking, robustness, disturbance rejection and noise minimization.
Novel Switching Design Structure for Three Phase 21-Level Multilevel Inverter Fed BLDC Drive Application
Authors: Janiga Srinivas Rao , Varma P. Srinivasa , Kumar T. Suresh
Published: January 2019

Multilevel Inverters offers eminent solutions to high voltage high power applications due to the association of several devices in a series configuration. This is moderate because of getting superior quality voltage waveform when using multilevel inverters as compared to form two-level inverters. Most of the problems raised in this study are the restriction of many switching devices, which can afford high voltage are preferred in the inverter. Here, a novel multilevel inverter topology with no transformers, less number of switching devices and gate drive circuits are proposed. The proposed inverter topologies can valid more voltage levels with favorable advantages such as less number of switching devices and gate driving circuits and also reduce to humble size, agreeable voltage profile. In this paper multilevel converter fed BLDC drive with different voltage levels and simulation analysis is presented. The validity of the proposed three-phase 21-level multilevel inverter fed to BLDC motor drive scheme is verified through Matlab/Simulink Platform.
9-Level Single DC Voltage Source Inverter Controlled Using Selective Harmonic Elimination
Authors: Shanono Ibrahim Haruna , Abdullah Nor Rul Hasma , Muhammad Aisha
Published: January 2019

This paper presents an efficient cascaded H-bridge inverter topology that is controlled using an optimized selective harmonic elimination pulse width modulation technique. The switching angles are obtained by solving the nonlinear transcendental equation with the aid of genetic algorithm optimization method. Unlike the usual H-bridge converter topologies that require multiple individual direct current (DC) sources and additional switching components per voltage step, the proposed topology utilizes a single DC source to supply two full-bridge modules. The modified topology employs a cascaded multi-winding transformer that has two independent primary windings and series-connected secondary side with 1:E  and 1:3E  turn ratios. The converter topology and switching function are proven to be reliable and efficient, as the total harmonic distortion (THD) is quite low when compared with the conventional H-bridge topology controlled by other modulation techniques. This feature makes it attractive to renewable energy systems, distributed generation, and highly sensitive equipment such as those used in medical, aerospace, and military applications. The topology is simulated using a PSIM package. Simulation results show that all the 11-level lower order odd harmonics are eliminated or suppressed in compliance with the SHE elimination theorem of (N-1).
A Novel Low Power-Application UPS consisting of an APF - Correction circuit & integrated Battery-Management system
Authors: Gumpini Venkat , Shekar O. Chandra
Published: January 2019

For the up-coming generations of power-supply systems, the load located area power-supply sources are an effective one, in terms of our requirements: simplicity, integrity, battery-backup, etc. This could follow the Normalization of power factor & Reducing THD% values on input current, which makes us to add an essential to include a power-factor correction unit at supply side in these new typical topologies. This Proposed architecture presents an integrated battery manage system which can also offers PF correction along with Galvanic-Isolation of battery in a humble single structure. [3] The proposed scheme has the reliable characters like increased efficiency, compact circuit and reduced costs associated with a traditional standalone multiple-stages UPS with PFC. This paper addresses the UPS action, the analysis and simulation results of Proposed UPS scheme.
Review on Optimised Configuration of Hybrid Solar-PV Diesel System for Off-Grid Rural Electrification.
Authors: Halim Amanda , Fudholi Ahmad , Phillips Stephen , Sopian Kamaruzzaman
Published: January 2019

At present, solar energy is perceived to be one of the world’s contributive energy sources. Holding characteristics such as inexhaustible and non-polluting, making it as the most prominent among renewable energy (RE) sources. The application of the solar energy has been well-developed and used for electricity generation through Photovoltaic (PV) as the harvesting medium. PV cells convert heat from the sun directly into the electricity to power up the electric loads. Solar PV system is commonly built in a rural area where it cannot be powered up by the utility grid due to location constrains. In order to avoid the electricity fluctuation because of unsteady amount of solar radiation, PV solar hybrid is the efficient solution for rural electrifications. This paper presents a review on optimised Hybrid Solar-PV Diesel system configurations installed and used to power up off grid settlements at various locations worldwide.
Soft Switching of Three-Phase AC to DC CIHRC with Wireless Power Transfer (WPT) Function
Authors: Baharom Rahimi
Published: January 2019

This paper presents the verification of soft switching condition for three-phase AC to DC current injection hybrid resonant converter (CIHRC) with wireless power transfer (WPT) function. Details on the operation of current injection technique with the lossless zero voltage switching (ZVS) condition on shaping the high power factor of supply current waveforms are presented. With a suitable high switching frequency operation, the proposed resonant converter is capable to operate with ZVS conditions, thus, allowing reduction in the size of inductive and magnetic components. Selected results are also presented to verify the lossless ZVS condition for three-phase AC-DC CIHRC with WPT function.
Speed Control of PMDCM Based GA and DS Techniques
Authors: Abed Wisam Najm AL-Din , Saleh Adham Hadi , Hameed Abbas Salman
Published: January 2019

Permanent magnet direct current motors (PMDCM) are widely used in various applications such as space technologies, personal computers, medical, military, robotics, electrical vehicles, etc. In this paper, the mathematical model of PMDCM is designed and simulated using MATLAB software. The PMDCM speed is controlled using rate feedback controller due to its ability of improving system damping. To improve the controller performance, it’s parameters are tuned using genetic algorithm (GA) and direct search (DS) techniques. The tuning process based on different performance criteria. The most four common performance criteria used in this paper are JIAE (Integral of Absolute Error), JISE (Integral of Square Error), JITAE (Integral of Time-Weighted Absolute Error), and JITSE (Integral of Time-Weighted Square Error). The results obtained from these evolutionary techniques are compared.  The results show an obvious improvement in system performance including enhancing the transient and steady state of PMDCM speed responses for all performance criteria.
Comperative Performance Analysis of PMSM Drive Using MPSO and ACO Techniques
Authors: Yadav Deepti , Verma Arunima
Published: January 2019

This work proposes an optimization algorithm to control speed of a permanent magnet synchronous motor (PMSM) during starting and speed reversal of motor, as well as during load disturbance conditions. The objective is to minimize the integral absolute control error of the PMSM shaft speed to achieve fast and accurate speed response under load disturbance and speed reversal conditions. The maximum overshoot, peak time, settling time and rise time of the motor is also minimized to obtain efficient transient speed response. Optimum speed control of PMSM is obtained with the aid of a PID speed controller. Modified Particle Swarm Optimization (MPSO) and Ant Colony Optimization (ACO) techniques has been employed for tuning of the PID speed controller, to determine its gain coefficients (proportional, integral and derivative). Simulation results demonstrate that with use of MPSO and ACO techniques improved control performance of PMSM can be achieved in comparison to the classical Ziegler-Nichols (Z-N) method of PID tuning.
MRAS Speed Sensorless Vector Control of Induction Motor Drives using Predictive Adaptation Mechanism
Authors: Zair Moustafa , Hazzab Abdeldjebar
Published: January 2019

Recently of the main topic of research is the sensorless vector control of induction motor drive, In this paper presents the predictive model reference adaptive system (PMRAS) rotor speed observer, This observer developed from the classical MRAS rotor flux scheme associated with predictive adaptation mechanism designed from the Finite Control Set Model Predictive Control (FCS–MPC) by using a search optimization algorithm for calculate the rotor position which guarantee a minimum speed tuning error signal at each sampling period. The effectiveness of the proposed observer proved with the simulation results, show high dynamic performance speed and position observed in sensorless vector control process at low and zero speed as well robustness against motor parameter variation with different loading conditions.