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CAPACITOR VOLAGE BALANCING OF A SPACE VECTOR MODULATION BASED ON THREE LEVEL INVERTER


Posted by: seminar class
Created at: Saturday 30th of April 2011 03:43:42 AM
Last Edited Or Replied at :Saturday 30th of April 2011 03:43:42 AM
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ptimized circuit layout and packaging are possible
3- Soft - switching techniques used in for reducing
switching losses and device stresses.
Cascaded H-Bridge Multilevel Inverter
Disadvantage-
 Needs separate DC sources for real power
conversion, thus its applications are limited
Cascaded H-Bridge Multilevel Inverter
PWM – Pulse Width Modulation
-> Also known as Pulse Duration Modulation
-> PWM- There width of pulses of carrier pulse train is
varied in accordance with modulating signal
Characteristics-
-> ..................[:=> Show Contents <=:]



A Simple Space Vector PWM Generation Scheme for Any General n-Level Inverter


Posted by: seminar class
Created at: Thursday 05th of May 2011 04:16:22 AM
Last Edited Or Replied at :Thursday 05th of May 2011 04:16:22 AM
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to generate SVPWMsignals for multilevel inverters. The proposed method uses sectoridentification only at the two-level. In the proposed method,the actual sector (where the tip of the instantaneous referencespace vector lies) in the space vector diagram of a multilevelinverter is not required to be identified. A method using theprinciple of mapping is proposed for generating the switchingvectors corresponding to the actual sector and the optimumswitching sequence of a multilevel inverter from that of the twolevelinverter. An algorithm is proposed for generating SVPWMfor any n-level inverter. Th..................[:=> Show Contents <=:]



Switching Characterization of Cascaded Multilevel-Inverter-Controlled Systems


Posted by: seminar class
Created at: Tuesday 03rd of May 2011 06:31:37 AM
Last Edited Or Replied at :Tuesday 03rd of May 2011 06:31:37 AM
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for the determination
of the minimum amplitude of the triangular carrier
for smooth modulation at fixed switching frequency. It is shown
that the multilevel modulation based on the phase-shifted carriers
significantly reduces the ripple magnitude in the switching
function and allows the use of a smaller carrier amplitude under
closed loop. This increases the forward gain and, hence, improves
the tracking characteristics. The proposed cascaded multilevel
inverter control is implemented for the operation of a distribution
static compensator (DSTATCOM) in the voltage control mode.
The ..................[:=> Show Contents <=:]



CAPACITOR VOLAGE BALANCING OF A SPACE VECTOR MODULATION BASED ON THREE LEVEL INVERTER


Posted by: seminar class
Created at: Saturday 30th of April 2011 03:43:42 AM
Last Edited Or Replied at :Saturday 30th of April 2011 03:43:42 AM
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It allows the achievement of output waveforms at a reduced.
switching frequency
- used for high-power applications
Disadvantage – Its complicated hardware implementation.
Selective Harmonic Elimination-
Virtual Stage PWM
Virtual stage PWM = Unipolar Programmed + Fundamental Frequency
PWM Switching Scheme
- Used for low modulation indices
Produce output waveform with lower THD
No. of switching angle not equal to No. of dc source
COMPARISON
Why Use PWM Techniques?..................[:=> Show Contents <=:]



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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oltages
 A DCMI with nl number of levels typically comprises (nl-1) capacitors on the DC bus
 Voltage across each capacitor is VDC/(nl-1)
( 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 mo..................[:=> 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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n three levels and reduces the dc-link capacitance without introducing any significant voltage ripple at the dc-link nodes. The proposed operation can be generalized for any number of levels. The validity of the proposed multilevel inverter operational mode is confirmed by simulations in mat lab v7.5. .
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 circuits is to generate a h..................[:=> Show Contents <=:]



46 NUETRAL POINT CLAMPED NPC INVERTERS


Posted by: project report helper
Created at: Thursday 14th of October 2010 12:16:49 AM
Last Edited Or Replied at :Thursday 14th of October 2010 12:16:49 AM
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vices – clamp output potential to neutral point with help of clamping diodes D10 D10’

All PWM techniques apply

NPC inverter operation
Consider HEPWM technique to eliminate 2 lowest significant harmonics (5th and 7th) and control fundamental voltage


..................[:=> 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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same resolution, flexibility for the dc-voltage feeding choice), a new solution is investigated : A symmetrical PT feeds an AMI.

Presented By:
Song-Manguelle, J. ; Rufer, A.


read full report
http://ieeexplore.ieee.org/iel5/8688/27523/01226433.pdf?arnumber=1226433..................[:=> Show Contents <=:]



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