Search results for " THD"
showing 3 items of 3 documents
Transanal hemorrhoidal dearterialization versus Milligan-Morgan hemorrhoidectomy in grade III/IV hemorrhoids.
2019
La terapia delle emorroidi di III e IV si basa sul trattamento chirurgico. All’emorroidectomia secondo Milligan Morgan (MM), da molti chirurghi considerata il gold standard, si affiancano attualmente metodi chirurgici considerati meno invasivi come la Procedura per Prolasso ed Emorroidi (PPH) e la dearterializzazione emorroidaria transanale (THD). Gli Autori hanno voluto confrontare in un trial prospettico e randomizzato la emorroidectomia secondo MM e la THD nel trattamento di emorroidi di III e IV grado valutandone i risultati a breve e medio termine. Materiali e metodi: Tra gennaio 2010 e marzo 2013 sono stati reclutati 87 pazienti con emorroidi di III e IV grado secondo la classificazio…
Experimental Evaluation of Dead-Time Impacts on the Efficiency and THD for a Three-Phase Five-Level Cascaded H-Bridge Inverter
2022
Cascaded H-Bridges Multilevel Inverter (CHBMI) is a fascinating solution for optimization purposes in several application fields. The CHBMI performance optimization can be reached both with hardware and software solutions. In detail, the CHBMI performances are a function of the modulation strategy adopted and its parameters such as modulation index, switching frequency, and dead time. This paper presents performance experimental analysis on dead time effects on CHBMI performance in terms of harmonic distortion and conversion efficiency. In this analysis, two different modulation strategies have been considered and implemented. The paper focuses on modulation strategies implemented, the test…
Experimental Comparative Analysis of Efficiency and THD for a Three-phase Five-level Cascaded H-Bridge Inverter Controlled by Several MC-PWM Schemes
2021
Cascaded H-Bridges Multilevel Inverters are an innovative and promising solution in different application fields. This topology allows obtaining an improvement in the performance (e.g. reduced harmonic content, the low voltage stress on power components, and high efficiency) in respect to the traditional two-level inverters. In this context, the Multicarrier-PWM strategies play an important role thanks to their features. This paper presents an experimental investigation on the performance of a three-phase five-level Cascaded H-Bridge inverter by using different PWM modulation strategies. In particular, the paper is focused on the experimental validation of the main features of Multicarrier …