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multilevel inverter


Posted by: seminar class
Created at: Wednesday 30th of March 2011 04:38:15 AM
Last Edited Or Replied at :Wednesday 28th of November 2012 12:57:38 AM
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( nl nodes on DC bus, nl levels of output phase voltage , (2nl-1) levels of output line voltage)
 Output phase voltage can assume any voltage level by selecting any of the nodes
 DCMI is considered as a type of multiplexer that attaches the output to one of the available nodes
 Consists of main power devices in series with their respective main diodes connected in parallel and clamping diodes
 Main diodes conduct only when most upper or lower node is selected
 Although main diodes have same voltage rating as main power devices, much lower current rating is allowable
..................[:=> Show Contents <=:]



Capacitor Balance Issues of the Diode-Clamped Multilevel Inverter Operated in a Quasi


Posted by: seminar surveyer
Created at: Wednesday 20th of October 2010 12:06:20 AM
Last Edited Or Replied at :Saturday 26th of January 2013 11:11:24 AM
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h states.


OVERVIEW OF THE PROJECT
SERIES connection of semiconductor devices is a solution for achieving higher converter voltage ratings; however, devices suffer from unbalanced static and dynamic voltage sharing, and the output voltage has a high dv/dt. A multilevel inverter can overcome these disadvantages. The multilevel concept is based on a step approximation to a sinusoidal voltage. Multilevel inverters belong to the inverter circuit family, where the output voltage comprised more than two intermediate discrete voltage levels. The purpose of these circui..................[:=> Show Contents <=:]



SINGLE-PHASE SINGLE-STAGE 3-LEVEL AC-TO-DC SERIES RESONANT CONVERTER


Posted by: seminar surveyer
Created at: Friday 08th of October 2010 11:32:56 PM
Last Edited Or Replied at :Monday 31st of January 2011 02:57:07 AM
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search on ac-to-dc converters with power factor correction and low total harmonic distortion (THD) is consistently enjoying increasing interests. As the industry interests and applications of these converters increase, enforcing agencies are coming up with more stringent harmonic standards such as IEC 61000-3-2, ANSI/IEEE-519, etc. Implementation of these standards calls for front-end power factor correctors (PFC) requiring additional components, cost, reduced efficiency and increased size. Singlestage ac-to-dc converters address most of these challenges. All of these converters are operatin..................[:=> Show Contents <=:]



Speed Control of AC Servomotor Using Sinusoidal PWM Inverter


Posted by: seminar presentation
Created at: Friday 28th of May 2010 09:28:00 AM
Last Edited Or Replied at :Monday 30th of January 2012 12:20:47 AM
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power conversion and motion control. Among different types of modulating modes the Sinusoidal Pulse Width Modulation (SPWM) and Space Vector PWM are two common strategies in adjustable speed drive system. The Pulse width of SPWM varies with the Sine wave so as to restrain the lower order harmonics with easy control and large D C utilization. With successively improving reliability and performance of digital controllers, the digital control techniques have predominated over other analog counter parts. The advantages of digital controllers are:
a) Reconfigurability
b) P ower saving options
c..................[:=> Show Contents <=:]



IMPLEMENTATION OF H BRIDGE INVERTER BASED DVR USING ATMEL 89C2051


Posted by: seminar presentation
Created at: Tuesday 18th of May 2010 10:53:38 AM
Last Edited Or Replied at :Tuesday 18th of May 2010 10:53:38 AM
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r
Abstract:
Among the various power quality problems, the voltage sags, are attracting a large amount of attention of researchers from industry. DVR gives the solution to the above mentioned problem. The main function of DVR is to mitigate the voltage sag. It controls voltage applied to the load by injecting voltage of compensating amplitude, frequency and phase angle to the distribution line. The DVR is primarily responsible for restoring the quality of voltage delivered to the end user when the voltage from the source is not appropriate to be used for sensitive loads. Usage of DVR enab..................[:=> Show Contents <=:]



Multilevel inverter for power system applications highlighting asymmetric design effe


Posted by: seminar topics
Created at: Tuesday 30th of March 2010 01:45:37 AM
Last Edited Or Replied at :Friday 28th of December 2012 11:52:10 PM
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(AMI) with the same number of partial cells per phase. An AMI is not more interesting than a classical three phase inverter. The total harmonic distortion of an AMI is compatible to the recommended IEEE std 519-1992 for all feeding possibilities for a given number of partial cells per phase. In order to exploit the main advantages of an asymmetrical design from a load point of view (generation of a high resolution voltage phasor, reduction of the number of power devices for the same resolution, flexibility for the dc-voltage feeding choice), a new solution is investigated : A symmetrical PT fe..................[:=> Show Contents <=:]



non conventional energy systems


Posted by: electronics seminars
Created at: Friday 15th of January 2010 01:36:36 PM
Last Edited Or Replied at :Friday 15th of January 2010 01:36:36 PM
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n Systems
k. Development of Three-Phase Unbalanced Power Flow Using PV and PQ Models for Distributed Generation and Study of the Impact of DG Models
l. Multi-Input Inverter for Grid-Connected Hybrid PV/Wind Power System
m. Load Balancing for Distributed and Integrated Power Systems using Grid Computing
n. Transient Fault Response of Grid Connected Wind Electric Generators
o. Dynamic modeling, design and simulation of a wind/fuel cell/ultra-capacitor-based hybrid power generation system
p. Wind-Driven Self-Excited Induction Generator With Voltage and Frequency Regulated by a Reduced..................[:=> Show Contents <=:]



DSP Enhanced FPGA


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:53:06 PM
Last Edited Or Replied at :Friday 12th of November 2010 10:13:42 AM
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ts (ASICs).

These advancements also offer mystical solutions to historically intractable signal processing problems resulting in major new market opportunities and trends. Traditionally for signal processing specific applications off the shelf Digital Signal Processors (DSPs) are used.

Exploiting parallelism in algorithms and mapping them on VLIW processors are tedious and do not always give optimal solution. There are applications where even multiple of these DSPs cannot handle the computational needs of the applications.

Recent advances in speed, density, features and low cost hav..................[:=> Show Contents <=:]



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