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27-Level asymmetric multilevel inverter for photovoltaic energy conversion
Aliaga, Rodrigo,Rojas, Diego,Munoz, Javier,Villalon, Ariel The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.4
This paper presents a novel structure to inject the electric energy from photovoltaic modules to the grid based on a 27-level asymmetric multilevel inverter. This work proposes mixing existing approaches based on string and central inverters to implement a hybrid structure that generates highly sinusoidal waveforms. Indeed, the presented structure allows for a staircase AC voltage waveform with a low level of harmonic distortion, which is a key feature for photovoltaic energy conversion. The proposal is supported with theoretical analyses that include system modeling and a suitable control strategy to track both the active and reactive power. A low power proof-of-concept prototype was built to validate the properness of the proposal. Several dynamic tests were performed, such as severe load impacts, partial shading and fault ride-through capability.
Josué Aliaga Ramos,Yoshinori Morita,Takashi Toyonaga,Danilo Carvalho,Moises Salgado Pedrosa,Vitor N. Arantes 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.5
Background/Aims: Endoscopic submucosal dissection (ESD) is currently considered the first-line treatment for the eradication of superficialneoplasms of the esophagus in Eastern countries. However, in the West, particularly in Latin America, the experience withesophageal ESD is still limited because of the high technical complexity required for its execution. This study aimed to present the resultsof the clinical application of ESD to manage superficial esophageal neoplasms in a Latin American center in over 100 consecutivecases. Methods: This retrospective study included consecutive patients who underwent endoscopic ESD for superficial esophageal neoplasmsbetween 2009 and 2022. The following clinical outcomes were assessed: en bloc, complete, and curative resection rates, local recurrence,adverse events, and procedure-related mortality. Results: Esophageal ESD was performed mainly for squamous cell carcinoma (66.6%), high-grade intraepithelial neoplasia (17.1%),and adenocarcinoma (11.4%). En bloc and complete resection rates were 96.2% and 81.0%, respectively. The curative resection rate was64.8%. Adverse events occurred in six cases (5.7%). Endoscopic follow-up was performed for an average period of 29.7 months. Conclusions: ESD performed by trained operators is feasible, safe, and clinically effective for managing superficial neoplastic lesions ofthe esophagus in Latin America.