Volume 1 Issue 4

Paper 1: MINIMIZATION OF TRANSIENTS IN BUCK CONVERTER USING CASCADE CONTROL TECHNIQUES (1-8)

Abstract: Power converters are broadly utilized for different modern applications because of their high efficiency, fast switching actions and low cost. It is hard to draw the limits for uses of electronic topologies due to latest advancement in semiconductor devices. The dc-dc conversion technology has been developing very rapidly because of its high efficiency, fast dynamic response and compactness. There is lot of ongoing research on this convertor and it has great attention in the field of power electronics convertors. This should effortlessly be possible with the assistance of state conditions and MATLAB/SIMULINK as an apparatus for reproduction of those state conditions. In this paper, a cascade controller model has been intended for the control of dc-dc Buck converters. In this research work cascade loop and single loop model have been outlined.

Author 1: Mumtaz Aziz Kazi

Author 2: Mukhtiar Ahmed Maher

Author 3: Irshad Rahim Memon

Author 4: Muhammad Farrukh Shaikh

Keywords: Single loop control system; Cascade loop control system; Single loop; Cascade loop; Pulse Width Modulation

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Abstract: In this paper, we concentrate the issue of fine-grained images categorization, which is a great deal more helpful in genuine applications than fundamental image classification and we have tried to overcome their problems and to achieve better performance using our proposed technique that is more efficient in terms of memory usage and technical complications as compare to older techniques that having more memory usage and technical complications. For most of datasets Bag of words model and fisher kernel model techniques were used to achieve better performance. In our paper technique used is combination of dense sift and hog descriptors and collectively used with VLAD and finally used by linear SVM classifier that gives better performance and less memory usage and having less technical complications of our taken datasets as compared to previous ones. The two most popular datasets taken are Caltech building dataset and Oxford flowers dataset. For Caltech Building dataset and Oxford flowers dataset we have achieved accuracy up to 87% and 80 % respectively along with best mean accuracy point results through our proposed Efficient VLAD (EVLAD) technique which are better than previous researchers state of art results.

Abstract: This paper explains the WhatsApp usage level among the students, their periods choice to use WhatsApp, their times surfing WhatsApp and to know how much ratio of the respondents use WhatsApp. Survey technique was used in this study for which 300 students of 1st to 4th years from three categories as BS, MSC and MA programs were selected as samples in university of Sindh. Through data analysis we reached at the result as 220 respondents use while the rest of 60 respondents do not use WhatsApp. According to time spending on using WhatsApp, after leaving 60 respondents not using WhatsApp, it was revealed that major proportion of respondents (100) out of 220 consume time in between 16 and 30 minutes. According to selection of period for using WhatsApp, the majority of the respondents (130) select period of night. With regarding the routine of using WhatsApp, the major proportion of the respondents (143) was known to have been using WhatsApp daily. Huge segment of the respondents (125) use WhatsApp in their hostels in terms of placement preferences. Those who use WhatsApp on daily basis were known to have been using their WhatsApp account more than four times a day.

Abstract: In this research work,the performance of AC voltage regulator feeding series RLC load is analyzed using MATLAB/SIMULINK. Various parameters are calculated and analysis of harmonics at different firing angles is achieved. The total Harmonic distortion (THD) at different firing angles are investigated using Fast Fourier Transform (FFT) technique. The SCR based regulator is being controlled by Phase angle control (PAC) method, in which by varying the firing angle the rms output voltage varies inverse proportionally. Such type of controllers is used as AC drives for various AC loads using voltage control method. Semiconductor based power devices provide higher efficiency, less maintenance and capability to withstand large amount of power. Hence, due to their numerous benefits and compact sizes AC voltage regulators finds several applications in industries. The results obtained from the investigation suggest the quality performance and effects to RLC load.

Abstract: Museum & Art gallery status of monitoring is very delicate. We should let professional’s handle it because analyses can either make or break a business. We know what desires to be done and we will benefit to fix acute customer and client problems instantly. Art work of the museum and galleries are mostly affected from the relative humidity (RH) and temperature variations. Significant variation in temperature can also cause the double inferior in quality rate of the paper usually with oil paints drawings or water color paintings. Irregular rise in levels of relative humidity (RH) cause the material to shrink swell corrode or deform. Indoor climate of the art gallery monitoring is essential and helpful in fortify the preservation of art gallery collection. Precious paintings are present in Art gallery and their cost in millions of dollars. So we cannot take risk due to avoid these unpredictable climatic conditions caused by fire, painting quality deterioration due to humidity and temperature. Moreover security of the art gallery also demands for continuous surveillance. Hence, to secure and monitor art gallery paintings at Museum and to overawed these climatic conditions, we necessity to develop an intelligent system that uses different sensors.

Abstract: Shape memory alloy (SMA) is a type of material that are able to return to its original shape.When subjected to appropriate temperature. The properties of SMA makes it suitable for actuation in robotics. When dealing with small size and weight of it. Especially when small size and weight are desirable. Shape memory alloy has many applications in bio-robotics such as Manta ray robot, Snake robot and fish robot etc. In this paper a SMA actuated inchworm is reported. The components used in the inchworm robot are the compression spring, shape memory alloys, plastic sheet, Crimps, Arduino board and ULN2003A and DC power supply. The designed inchworm robot mechanism has 2 plastic plates attached to glue. These plastic plates have negligible weight and compression spring is used for bias force .To assure better mechanical design of robot SMA actuator and spring are employed. When a signal is given from computer the power is transmitted from DC power supply, and supply SMA wire. Then current causes an increase in temperature of wire, as a result wire contracts and pushes the worm in forward direction.

Abstract: Solar energy is rapidly gaining more importance as an expanding source of renewable energy resources. As such, it is vital to understand the technologies associated with it. Now a days researchers are more interested to increase the overall efficiency of solar system by various means. This research work proposes dual axis solar tracking system to increase the overall efficiency of solar plate. The work is focused on design and implementation of dual axis solar tracker system to track the sun whole day. Dual axis solar tracker system allows more energy to be produced by solar plate because the solar array is able to remain aligned to sun. In this research work, a scaled down dual axis solar tracker is designed and its performance is compared with single axis solar tracker system. The comparative analysis of dual axis and fixed mount solar system on the basis of overall energy efficiency is discussed in detail. From results it is very clear that dual axis solar tracker system gives an overall energy efficiency of 48.98 % which is preferably more than fixed mount solar system.

Abstract: Street mischance has turned into a typical event today. Consistently a huge number of individuals kick the bucket in street mishaps, a few people are fortunate to escape with few scratches and a few people have a tendency to endure genuine wounds because of street crossing point impact. A vehicular system comprises of V2V and vehicle to framework communications upheld by remote get to advancements, for example, IEEE 802.11p. VANET applications are used to the human from severe injuries enhance comfort level and improve the flow of the traffic. The main goal of this paper is to discuss in detail the safety and non safety applications of VANET.

Abstract: This paper forecasts the energy consumption of Pakistan which is facing a huge and permanent shortfall of electricity. Being a fast developing economy in the current era, water and power development authority has to plan power production project by keeping in mind the future needs of the country. Carbon Dioxide (CO2) emission is a major concern for environmental protection agency for fast developing economies, so we have forecasted CO2 using ARIMA forecasting modeling. Further, we forecasted Energy Consumption as this country is facing a shortfall of almost half of the total electricity consumption using ARIMA.

Abstract: An electric motor is an important element of the power system. Three-phase induction motor is an industrial load, in almost 70-80% applications of industrial this kind of motor is used. When motor is started by conventional methods, it causes voltage reduction but by using soft starters better response can be achieved as compare to conventional methods, there are few main problems with soft starters such as; they are responsible for harmonics generation. The introduction of electronic devices in the power system cause harmonics and cause malfunctioning of induction motor. In this work six pulse thyristors are used to control speed of motor at different firing angles, these firing angles produces harmonics, more the firing angle, more will be harmonics issues. This paper is aimed to analysis of harmonics at different angles and mitigating harmonics by using composite passive harmonic filter in MATALB/SIMULINK.

ESTIRJ Volume 1 , Issue 4 - Decemebr - 2017

Paper 1: MINIMIZATION OF TRANSIENTS IN BUCK CONVERTER USING CASCADE CONTROL TECHNIQUES (1-8)

ISSN: (e) 2520-7393
(P) 2521-5027

ESTIRJ Volume 1 , Issue 4 - Decemebr - 2017

Paper 1: MINIMIZATION OF TRANSIENTS IN BUCK CONVERTER USING CASCADE CONTROL TECHNIQUES (1-8)

ISSN: (e) 2520-7393 (P) 2521-5027

ISSN: (e) 2520-7393
(P) 2521-5027