VOLUME 1, ISSUE 5, AUGUST 2013

Abstract: This paper proposes a new Maximum Power Point Tracking (MPPT) algorithm employed in Wind Energy Conversion Systems (WECS). One of the major issues concerning HCS is its inefficiency in detecting the peak power when there is a change in wind ·speed. In addition, the HCS produces oscillations in delivered power once this peak is detected. A modified HCS algorithm is proposed in this paper to overcome these limitations. This algorithm employs a variable duty cycle to reduce the oscillations in delivered power once the peak power is detected.

Keywords: HCS, MPPT, PMSG, TSR, WECS.

Abstract: This paper discusses two circuits for piezoelectric energy harvesting; one is integrated circuit which consists of LTC®3588-1; a complete piezoelectric energy harvesting power supply, other one is a discrete circuit. Former one is simulated with the LTSPICE; later one is simulated in Proteus, and both the circuits are practically built and tested in laboratory. Based on the comparative study of these circuits, we suggest the use of integrated circuit in harvesting the mechanical energy (pressure) produced in shock absorbers of bike which could serve as an ancillary source of energy for charging mobile phone battery.

Keywords: Energy Harvesting, Piezoelectric transducer, Shock absorber, Battery charging, LTC 3588-1

Abstract: Now a days, Microstrip Patch antennas have become a rapidly growing area of research. Their applications are limitless, because of their light weight, compact size, and ease of manufacturing. One limitation is their inherently narrow bandwidth. Hence the main objective is on to increase the bandwidth of the antenna. Design and analysis of Compact Multiband Microstrip Patch Antennas and a circularly polarized microstrip antenna for many kind of wireless communication applications are studied and presented. The multiband antenna posses 14-dB around the GSM 900 band of operation and greater than 8-dB return loss with bandwidths enough to cover the intended higher operating bands. As the proposed antenna can achieve such wide operating bandwidth with relatively low profile, it is very suitable for multi-band mobile communication handsets. The antenna is suitable for use in hand-held or other mobile devices. The new antenna can be used for several applications, especially in the GSM domain, and for Wi-Fi, Bluetooth, and several other applications, as detailed in this paper.

Keywords: Microstrip antennas, WLAN, GSM, Bluetooth, Bandwidth, Aperture Coupled Feed

Abstract: This paper proposes to optimize the system speed with minimal cost and hardware by making use of pipelining approach in the designing of FIR filter. The non- pipelined and pipelined FIR filter has been designed using Hardware Description Language (HDL) and a comparative study of both the filter designs using Radix-4 & Radix-8 has been done. The design synthesis and power analysis are carried out using Xilinx ISE 13.1and Synopsis tool, respectively. The concept of pipelining has been incorporated that results in reducing the delay of the FIR filter, thereby enhancing the speed and reducing the power dissipation as compared to the non-pipelined techniques. Simulation validates the results.

Keywords: FIR filter, Booth multiplier, Pipelining, Non-pipelining, Kaiser Window.

Abstract: Segmentation of anatomical regions of brain is fundamental problem in medical image analysis. In general, segmentation is process in which object is divided into its constituents parts. In this paper, MRI of brain is divided into its constituent’s parts which may be used for medical diagnosis purpose. Consequently we used statistical approach to segment the brain image. Using this approach, we proved Gaussian multiresolution algorithm gives better result than EM algorithm under the variance. We know that EM algorithm fails to utilize the strong spatial correlation between pixels but this drawback is eliminated by combining Gaussian multiresolution algorithm with the EM algorithm. Finally Gaussian multiresolution EM algorithm displays the high powerful technique which keeps the advantage of EM algorithm and remove the drawback of EM algorithm.

Keywords: MRI, Image segmentation,EM algorithm,GMEM Algorithm,Matlab

Abstract: The prediction of rain fade slope on satellite link is currently an essential parameter used by system designers for the development of communication power control and error-correction schemes, which mini-mize effects of the link outages for their systems. It is also useful for the implementation of computer generated received signal for primary experiments. Due to its time variation and dependence on the rain type and characteristics, it will be useful to develop an efficient model that fits the fade slope evaluated from the link. Fade slope indicates the rate of change of rain attenuation. The knowledge of fade slope of attenuation caused by rain or other meteorological events are very important for fade mitigation techniques. Knowledge of this parameter is important for determining the required tracking speed of fade mitigation techniques. The fade slope depends on attenuation level, on sampling time and on climatic parameters (drop size distribution and therefore on the type of rain).

Abstract: Injection of wind power into an electric grid affects the power quality and reactive power issues at the connected electric network. Power quality problems such as voltage sag are some major concern. In this paper these issues are analyzed. Wind turbine connected to squirrel cage induction generator is modeled using PSCAD simulation software to analyze the said issues where STATCOM is introduced as an active voltage and reactive power supporter to increase the power system stability. STATCOM unit is developed to inject reactive power for mitigation of power quality problems and to get stable grid operation.

Keywords: Squirrel Cage Induction Generator (SCIG); PSCAD; Wind Turbine Generator (WTG); Static Synchronous Compensator (STATCOM); Power Quality.