Comparative Analysis of Various Z-source Based Five Level Cascaded H-bridge Multilevel Inverter

Z-source based multilevel inverters are the recent topologies as they have boosting ability and near sinusoidal output waveforms. This paper proposes different inverter topologies such as Z-source multilevel inverter and quasi Z-source multilevel inverter. This paper also deals with switched inductor and improved switched inductor topologies with quasi Z-network. The proposed switched inductor system reduces the voltage stresses caused by capacitors, power devices and diodes. In addition to multilevel inverter advantages, the proposed configuration employs Z-source inverter advantages. The Z-source inverter as compared to the traditional inverter is less costly, less complex, more efficient and more reliable. The performance of the proposed configurations is analysed by varying passive elements in impedance network and is simulated in MATLAB/SIMULINK. Phase disposition (PD) pulse width modulation (PWM) technique is applied on the proposed configurations and performance parameters are measured by the fast Fourier transform FFT analysis. The object of this paper is to develop an inverter which is used for variable speed drives with increase in output voltage by eliminating transformer and filter circuit. The performance is checked with standared parameter of the inverter

ENHANCEMENT OF SMARTNESS AND SECURITY IN ATM BY GLOBAL SYSTEM FOR MOBILE COMMUNICATION

An automated or Automatic Teller Machine (ATM), also known as the automated banking machine, is a computerized telecommunicating device. Nowadays more people using ATM to withdrawing the money. Therefore, security is more important in ATM centre. This work is to prevent users attacked by strangers during withdraw the money so innovative ideas proposed to improve the security. In this model metal detectors fixed at the doors to detect metals such as a knife, gun, etc. and use of Infrared Ray (IR) sensor to allow one person at a time in ATM centre. If the user is not trained about ATM means at that time security help that person through biometric fingerprint. In this model, the work is also implemented two password systems at the time of user hijacked by a stranger. Finally, the work is implemented, people have to know about ATM working condition without going to the ATM centre. Global System for Mobile communication (GSM) interfaced with an ATM network that provides all information about ATM working condition to users mobile

Enhancing power quality in grid-connected hybrid renewable energy systems using UPQC and optimized O-FOPID

Hybrid Renewable Energy Systems (HRES) have recently been proposed as a way to improve dependability and reduce losses in grid-connected load systems. This research study suggests a novel hybrid optimization technique that regulates UPQC in order to address the Power Quality (PQ) problems in the HRES system. The load system serves as the primary link between the battery energy storage systems (BESS), wind turbine (WT), and solar photovoltaic (PV) components of the HRES system. The major objective of the study is to reduce PQ issues and make up for the load requirement inside the HRES system. The addition of an Optimized Fractional Order Proportional Integral Derivative (O-FOPID) controller improves the efficiency of the UPQC. The Crow-Tunicate Swarm Optimization Algorithm (CT-SOA), an enhanced variant of the traditional Tunicate Swarm Optimization (TSA) and Crow Search Optimization (CSO), is used to optimize the control parameters of the FOPID controller. Utilizing the MATLAB/Simulink platform, the proposed method is put into practice, and the system’s performance is assessed for sag, swell, and Total Harmonic Distortion (THD). The THD values for the PI, FOPID, and CSA techniques, respectively, are 5.9038%, 4.9592%, and 3.7027%, under the sag condition. This validates the superiority of the proposed approach over existing approaches

ASSESSMENT OF VARIOUS BIPOLAR VARIABLE AMPLITUDE SPWM STRATEGIES FOR A THREE PHASE TRINARY SOURCE NINE LEVEL INVERTER

This paper presents an inclusive analysis of various Bipolar Variable Amplitude Pulse Width Modulation (BVAPWM) techniques with Sinusoidal reference for three phase Trinary Source Nine level cascaded inverter. A new approach of nine levels is for medium voltage applications. The proposed topology adopts various new schemes such as constant switching frequency with variable amplitude triangular carrier control freedom degree combination concepts, which were developed and simulated for the chosen inverter using MATLAB-SIMULINK. The chosen asymmetrical inverter uses reduced number of switching devices, lower voltage stress of devices, lower electromagnetic interference, low level of high frequency noise, better RMS voltage, lower common-mode voltage and thus reducing losses and low THD in comparison with the literature of exploited conventional topologies existing so far. The configuration of the circuit is simple and easy to control. Performance factors such as %THD, VRMS where measured and Distortion Factor (DF) of output voltage were calculated for different modulation indices and the results are compared. It is observed that BVAPODPWM technique provides minimum THD, BVAAPODPWM technique provides lower DF and BVACOPWM technique provides higher fundamental VRMS output voltage

High-coercivity magnetism in nanostructures with strong easy-plane anisotropy

We report the fabrication of a rare-earth-free permanent-magnet material Co3Si in the form of nanoparticles and investigate its magnetic properties by experiments and density-functional theory (DFT). The DFT calculations show that bulk Co3Si has an easy-plane anisotropy with a high K1≈64 Merg/cm3 (6.4 MJ/m3) and magnetic polarization of 9.2 kG (0.92 T). In spite of having a negative anisotropy that generally leads to negligibly low coercivities in bulk crystals, Co3Si nanoparticles exhibit high coercivities (17.4 kOe at 10K and 4.3 kOe at 300 K). This result is a consequence of the unique nanostructure made possible by an effective easy-axis alignment in the cluster-deposition method and explained using micromagnetic analysis as a nanoscale phenomenon involving quantum-mechanical exchange interactions

Structural and magnetic properties of Co-V nanoparticles

We have investigated the structural and magnetic properties of Co1-xVx nanoparticles (NPs) with composition x = 0.25 (stoichiometric) and 0.29 (under-stoichiometric) prepared by the cluster-beam deposition (CBD) technique. Our data shows that the as-made Co1-xVx NPs are a mixture of the high-temperature phase (HTP) and the low-temperature phase (LTP) of Co3V and the particles are superparamagnetic at room temperature (RT) with blocking temperatures (TB) of 90 and 137 K for x = 0.25 and 0.29, respectively. This behavior contrasts with the bulk which are paramagnetic down to 4.2 K. When the Co75V25 NPs are annealed at 573 K, they undergo a phase separation into a mixture of phases and become ferromagnetic at room temperature with Curie temperature (Tc) of 515 K

Magnetism of cluster-deposited Y–Co nanoparticles

Nanoparticles of YCo2, YCo3, and YCo5 are produced by cluster-deposition and investigated both structurally and magnetically. The nanoparticles have sizes of less than 10 nm and are superparamagnetic at 300 K, irrespective of stoichiometry. As-produced nanoparticles exhibit disordered structures with magnetic properties differing from those of the bulk particles. The temperature-dependent magnetization curves of the nanoparticles reveal blocking temperatures from 110 to 250 K, depending on stoichiometry. The magnetic anisotropy constant K1 of disordered YCo5 nanoparticles of 7.8 nm in size is 3.5×106ergs/cm3, higher than those of the disordered YCo2 (8.9×105ergs/cm3) and YCo3 (1.0×106ergs/cm3) nanoparticles

Amyloodinium ocellatum infestation in the broodstock of silver pompano Trachinotus blochii (Lacepede, 1801) and its therapeutic control

A case of amyloodiniosis caused by infestation of the dinoflagellate Amyloodinium ocellatum in the silver pompano (Trachinotus blochii) maintained for broodstock development is reported. Grossly, erosion of the operculum and excessive secretion of mucus on gills was observed. Microscopic examination of gill filaments showed the presence of trophonts. Histopathologically, gills showed erosion and necrosis of the primary and secondary lamellae. The causative organism A. ocellatum was identified based on the clinical signs as well as gross and microscopic examinations. Among many treatment methods tested, dip treatment with chloroquine phosphate (500 mg per 100 l of water) or with low saline water mixed with Oodinol 1000 were found useful in healthy maintenance of silver pompano broodstock