The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Hybrid multilevel inverter topology is proposed for high power transformer less grid interactive photovoltaic power plant. Cascaded H-Bridge & Neutral Point Clamp topologies are hybridized to form this topology. Trinary asymmetric ratio of dc bus voltage is adapted for increasing the number of levels. Only three basic switching stages (two single phase H bridge cell and an NPC structure with common...
A three phase hybrid multilevel inverter topology is proposed for grid integrated photovoltaic central inverter systems. This topology is a hybrid of cascaded H bridge topology (CHB) and neutral point clamped (NPC) topology. The inverter uses asymmetric structure of dc bus voltage to increase the number of levels of the inverter. Third harmonic injection is proposed in order to have better utilization...
A 29-level three phase binary hybrid multilevel inverter is proposed. Only three basic switching cells (single phase H bridge cell) are used in each phase. Third harmonic voltage is injected in order to increase the number of levels, and to increase the DC bus utilization. Also, increase in number of levels gives more flexibility to reduce THD (Total Harmonic Distortion) of the system and in turn...
A 42GHz ECRH system would be used to carry out pre-ionization and start-up experiments on Tokamaks SST-1 and Aditya. The system would give reliable start-up in SST-1 Tokamak at 1.5T operating toroidal magnetic field. Fundamental O-mode would be launched from low field side of tokamak. The same system would also be used in Tokamak Aditya to carry out second harmonic ECRH assisted breakdown experiments...
This Paper presents an Oppositional Biogeography-Based Optimization algorithm to solve complex Economic Emission Load Dispatch (EELD) problems of thermal power systems. Emission of NOx and SOx are considered for case studies. The proposed method is a modification over Biogeography-Based Optimization technique, designed to accelerate its convergence rate and to improve the quality of solution. This...
In this paper, a wideband planar multi resonator antenna with parasitic coupling is proposed and studied. Impedance and radiation characteristics of this antenna are presented and discussed. From the results, it has been observed that, the Impedance bandwidth, defined by 10 dB return loss, can reach an operating bandwidth of 251 MHz with center operating frequency of 3023 MHz, which is about four...
In this paper modified simulated annealing (MSA) and particle swarm optimization (PSO) techniques are proposed to minimize total losses in a network system with flexible AC transmission systems (FACTS) devices. The problem is decomposed in two sub-problems. The first sub-problem is optimal placement of FACTS devices using line loss sensitivity index and the second sub-problem is the load flow with...
This Paper presents Biogeography-Based Optimization (BBO) algorithm to solve complex Economic Emission Load Dispatch (EELD) problems of thermal generators of power systems. Different emission substances like NOx, SOx are considered for case studies. Biogeography deals with the geographical distribution of biological organisms. Mathematical models of Biogeography describe how species migrate from one...
This Paper presents a Biogeography-Based Optimization (BBO) algorithm to solve Non-convex Economic Load Dispatch (ELD) problems of thermal plants in a power system. The Proposed methodology can take care of economic load dispatch problems involving constraints such as valve point loading, Multi-fuel Options. Biogeography deals with the geographical distribution of biological species. Mathematical...
The paper presents a novel and efficient method of regular geometric shape detection from gray scale images. Artificial ant based methods have not been used much in the field of image processing. This paper demonstrates how artificial ants can be used effectively to extract regular geometric shapes from images. We propose here ant regeneration and recombination system (ARRS), an entirely new approach...
The paper presents a novel concept of improving the convergence speed and solution quality of particle swarm optimization algorithm by Lyapunov modeling of fitness function. Most of the fitness functions that appear in practice can be transformed into positive definite function by using some minor transformations and shifting the coordinates system in the multidimensional space. The paper demonstrates...
The paper proposes two novel and efficient methods of circle detection from gray scale images. As a tool, we have used in one scheme ant colony algorithm. In other scheme, we have used ant regeneration and recombination system (ARRS), an entirely new approach developed by ourselves. In both the schemes presented here, three common steps were followed. Firstly, MATLAB edge detection operator converts...
Self-aligned barrier processes are being investigated as an alternative to standard dielectric barrier processes for the 65 nm technology nodes and beyond. Variations in the dielectric barrier process can modulate the copper-dielectric interface and the SiC/low k interface to improve dielectric and electromigration reliability. For the first time, in this paper, we will show that optimization of both...
A highly reliable interface using a self-aligned CuSiN process with low-k SiC barrier dielectric (k=3.5) has been developed for 65nm node and beyond. Using this process as the barrier dielectric, a 4% reduction of the capacitance between the adjacent lines was obtained in comparison to SiCN dielectric (k=4.9) without the electrical failure. In addition, 39times via electro-migration (EM) improvement...
The realisation of a microprocessor-based controller which implements a complete state feedback control strategy for a current source inverter-fed induction motor drive is reported. The controller design is based on the application of pole assignment technique of the multivariable system regulation theory to a d-q axes state-space linearised model of the drive and includes a reduced order observer...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.