Assam Don Bosco University Journals
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A Review on Stability Improvement of Wind Farm using FACTS Device
Get PDFThis paper represents a review on Stability improvement of wind farm using the Flexible AC Transmission System (FACTS) device. FACTS devices are used to increase the transient stability on the presence of faults and the integration of renewable sources, like wind energy. Due to continuously varying wind speed and also due to fault the active and reactive power along with terminal voltage fluctuates continuously. By connecting Static Synchronous Compensator (STATCOM) into the grid, the active power, reactive power, and terminal voltage are maintained constant and also help to improve the transient stability of the system
FACTS controllers' impact on Power Quality: A comparative analysis
Get PDFFor last couple of decades, the demand for electrical power has increased manifold. As we have limited resources of power generation, it results into heavy loading of the transmission line, which leads to stability, voltage sag/swell and reactive power issues. Application of FACTS controllers in a power system is a promising and more efficient way for transfer and control of a bulk amount of power. This paper focuses on voltage dependency on reactive power and control of the same for improvement in the power quality. A comparative analysis of steady-state power flow control of a power system transmission network using FACTS controllers namely SVC, STATCOM and TCSC are performed. The performance of these FACTS controllers in the control of power flow on a given test bus system is analyzed. Voltage magnitude is compared for shunt-connected controllers to analyze the efficiency. Reactance modeling and power injection modeling techniques are used to incorporate the FACTS controllers into Newton-Raphson load flow algorithm. Numerical results on a benchmark 5 bus test system with incorporation of each of the FACTS controllers are presented
Experimental Performance Assessment of a low-cost single-phase Arduino-based Power Meter
Get PDFA single-phase, low-cost, plug and play, portable and wireless meter has been implemented to measure the electrical parameters of typical household electrical loads ranging from a few watts to a few kilowatts. ADE7753 smart measuring IC was employed to acquire load current and voltage information through sensors. The Arduino Mega 2560 board, alongside the Arduino Wi-Fi shield were used for wireless communication and for logging of information on an external memory card. Measurements performed on eight typical office loads using the proposed meter and a calibrated Fluke 345 power quality clamp meter revealed an acceptable performance for most of the considered electrical appliances. The absolute percentage error in measured active power and cumulative energy consumption were less than 5 % for most of the considered appliances. The total cost of the system was 139 USD, which makes it affordable to measure the power consumption of different typical domestic loads
Variable Evaluation and Optimal Placement of STATCOM in Test Bus Systems
Get PDFThis paper presents the mathematical steady-state modelling of Static Synchronous Compensator (STATCOM) for voltage control of a bus and hence the variable of the controller. MATLAB programs have been developed for implementation of a few models of STATCOM. In this regard, Newton-Raphson load flow algorithm has been modified for incorporating models of STATCOM in some standard test bus systems. IEEE 5-bus system and IEEE 14-bus system are considered. Load sensitivity factors, which are defined as the effect of load on power system variables, are evaluated for load buses of the above mentioned test bus systems by increasing load on each load bus to 140% of base case value. Since load change affects node voltage, hence node voltage load dependency factor (NVLDF) of all buses are evaluated for finding optimal location of STATCOM. Thus this paper aims at evaluation of variable of STATCOM and finding optimal location for the same
Performance Of IEEE 802.11 OFDM With Multiple Frequency Transforms And Pulse Shaping Schemes
Get PDFOrthogonal Frequency Division Multiplexing (OFDM) is employed in various communication systems such as the IEEE 802.11 wireless standards, in which both frequency transform, Fast Fourier Transform (FFT) and pulse shaping filter, Square Root Raised Cosine (SRRC) are used. The main contribution of this paper is the analysis of the performance of different combinations of frequency transforms and pulse shaping schemes for the 802.11n standard. The frequency transforms which have been used are: Fast Fourier Transforms (FFT), Discrete Wavelet Transforms (DWT) and Discrete Hartley Transform (DHT). The pulse shaping filters are the Raised Cosine (RC), SRRC and Flipped Exponential Pulse (FEXP). The IEEE 802.11 WLAN system with Additive White Gaussian (AWGN) has been used as the modelling environment. The results showed that the DWT-based OFDM system has a better performance than the DHT and FFT schemes and upon comparing the pulse shaping filters, the SRRC filter outperforms the FEXP and RC filters
A Review on Distribution Network Reconfiguration
Get PDFIn distribution systems, network reconfiguration is comprehended by changing the best possible status of placing the sectionalizing switches. It is generally performed for reducing the losses or for balancing the load in the system. Generally for the distribution systems, meshed networks are configured in a feeble manner with manifold supply points, but they are controlled with radial configurations by unbolting the redundant branches. The system should be recompensed, otherwise it creates disturbance which lead to variation in supply voltages. In this paper, a study related to network reconfiguration techniques is presented in order to avoid network congestion showing the importance of FACTS devices along with an overview of issues related to voltage collapses in distribution system
Photocatalytic Degradation of Methyl Orange using MoS2 nanoparticles as catalyst
Get PDFMoS2 is a semiconductor transition metal dichalcogenide material (TMD) which has exciting optoelectronic properties. Due to its band gap (BG) energy lying in the visible range it shows good photocatalytic behavior. In this report, we have synthesized MoS2 nanoparticles (NPs) and its morphology is characterized using XRD and SEM. EDX is performed to analyze the composition of the as-synthesized material. Multiple BG energy in the visible light range is observed from the analysis of UV-Visible spectroscopy. We have investigated the photocatalytic property by the degradation of Methyl Orange (MO) using MoS2 nanoparticles as catalyst. It is observed that the as-synthesized MoS2 NPs degrade MO very efficiently with 98% degradation using 1mg in 1ml 10μM dye solution in 2hr
An Athropological Peep into the Ali-Aye-Lrigang Festival of the Misings of Assam
No full textThe article was contributed by Dowarah and Goswam
CONVERSION OF REDUCED GRAPHENE OXIDE INTO MULTI-WALLED CARBON NANOTUBES
Get PDFWe report the green, simple microwave-assisted approach for catalytic conversion of reduced graphene oxide(rGO) into multi-walled carbon nanotubes(MWCNTs) in presence of conducting polymer poly aniline(PANI) and Indium tin oxide(ITO) powder as catalytic agent. Rod like MWCNTs with inner hollow bamboo-shaped structures were obtained. The observed MWCNTs have length 6025 nm and outer diameter 150nm. The UV-Visible absorption spectrum of MWCNTs shows bands at 236 and 254nm which results from the π-plasmon excitation. In photoluminescence(PL) spectra , MWCNTs shows emission bands at 439 and 659nm when excited at 325nm. Infra-red spectroscopy and electrochemical studies were performed for the MWCNTs. The morphology of the MWCNTs were characterized by using X-ray diffraction(XRD), Scanning Electron Microscope(SEM) and Transmission Electron Microscope(TEM) techniques
VISIBLE LIGHT ASSISTED PHOTOCATALYTIC DEGRADATION OF METHYLENE BLUE USING TITANIUM DIOXIDE PILLARED SILVER-MONTMORILLONITE COMPOSITE IN WATER
Get PDFWater is an easy solvent, enabling most of the pollutants to dissolve in it easily and contaminate it. Now a days industrial wastes mainly organic wastes are the main sources of water pollution. Among the advanced oxidation processes, photocatalysis by semiconducting materials has become a leading technology in the field of environmental cleaning. In the present study a naturally occurring smectite clay, montmorillonite is modified with Ag(I) and TiO2. The performance of the material was tested in degradation of methylene blue under visible light irradiation. Dose variation, concentration variation and effect of time of the degradation reactions are done in the study. The catalyst was characterized by FTIR spectra and BET surface area analysis. Due to the excellent sedimentation property after reaction the clay can be easily recovered and reused