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A Two-stage Single-phase Grid-connected Solar-PV System with Simplified Power Regulation

Chinese Journal of Electrical Engineering 2022年第1期8卷 81-92页

作者： Ganesh Moorthy Jagadeesan raja pitchaimuthu Moorthi Sridharan Department of Electrical and Electronics Engineering National Institute of TechnologyTiruchirappalli 620015India

This study focuses on the design and development of a simplified active power regulation scheme for a two-stage single-phase grid-connected solar-PV(SPV)system with maximum power point(MPP)*** aims to formulate and test an improvised new control scheme to estimate the real-time MPP of the PV panel and operate only at either the MPP or on the right-hand side(RHS)of the PV characteristics of the panel.A simple active power regulatory control scheme was formulated to provide frequency control services to a single-phase grid without using an energy storage *** plant operator provides the reserve fraction as the input for the active power regulation *** any time,the reserve fraction is used to determine the magnitude of the reference power to be extracted from the PV panel for injection into the grid.A simple PI controller was used to track the calculated reference *** different modes of operation of the regulatory scheme are presented in *** the above control schemes are integrated and implemented through appropriate switching of the DC-DC converter *** DC-AC converter maintains the DC link voltage and unity power factor at the single-phase grid *** proposed control schemes were tested on a 250 Wp solar panel feeding power to a 230 V,50 Hz single-phase grid through a two-stage *** entire scheme was modeled using the Matlab/Simulink platform,and the same was validated by hardware experimentation using Chroma Solar Simulator and NI myRIO controller under varied irradiation,temperature,and reserve *** simulation and hardware results are compared and reported.

关键词： Solar photo voltaic(SPV) maximum power point(MPP) right hand side(RHS) power regulation

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A gist of gastrointestinal stromal tumors: A review

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World Journal of Gastrointestinal Oncology 2013年第6期5卷 102-112页

作者： Ashwin Rammohan Jeswanth Sathyanesan Kamalakannan Rajendran Anbalagan pitchaimuthu Senthil-Kumar Perumal UP Srinivasan Ravi Ramasamy Ravichandran Palaniappan Manoharan Govindan The Institute of Surgical Gastroenterology and Liver Transplantation Centre for GI Bleed Division of HPB Diseases Stanley Medical College Hospital

Gastrointestinal stromal tumors (GISTs) have been recognized as a biologically distinctive tumor type, different from smooth muscle and neural tumors of the gastrointestinal tract (GIT). They constitute the majority of gastrointestinal mesenchymal tumors of the GIT and are known to be refractory to conventional chemotherapy or radiation. They are defined and diagnosed by the expression of a proto-oncogene protein detected by immunohistochemistry which serves as a crucial diagnostic and therapeutic target. The identification of these mutations has resulted in a better understanding of their oncogenic mechanisms. The remarkable antitumor effects of the molecular inhibitor imatinib have necessitated accurate diagnosis of GIST and their distinction from other gastrointestinal mes-enchymal tumors. Both traditional and minimally invasive surgery are used to remove these tumors with minimal morbidity and excellent perioperative outcomes. The revolutionary use of specific, molecularlytargeted therapies, such as imatinib mesylate, reduces the frequency of disease recurrence when used as an adjuvant following complete resection. Neoadjuvant treatment with these agents appears to stabilize disease in the majority of patients and may reduce the extent of surgical resection required for subsequent complete tumor removal. The important interplay between the molecular genetics of GIST and responses to targeted therapeutics serves as a model for the study of targeted therapies in other solid tumors. This review summarizes our current knowledge and recent advances regarding the histogenesis, pathology, molecular biology, the basis for the novel targeted cancer therapy and current evidence based management of these unique tumors.

关键词： Gastrointestinal stromal tumors c-KIT Imatinib mesylate Surgery Review

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Implications of the presence of an aberrant right hepatic artery in patients undergoing pancreaticoduodenectomy

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World Journal of Gastrointestinal Surgery 2014年第1期6卷 9-13页

作者： Ashwin Rammohan Ravichandran Palaniappan Anbalagan pitchaimuthu Kamalakannan Rajendran Senthil Kumar Perumal Kesavan Balaraman Ravi Ramasamy Jeswanth Sathyanesan Manoharan Govindan The Institute of Surgical Gastroenterology and Liver Transplantation Centre for GI Bleed Division of HPB diseases Stanley Medical College Hospital

AIM:To analyze the differences in outcomes and the clinical impact following pancreatoduodenectomy(PD)in patients with and without aberrant right hepatic artery(aRHA).METHODS:All patients undergoing PD between January 2008 and December 2012 were divided into two groups,one with aRHA and the other *** groups were compared to identify differences in the intraoperative variables,the oncological clearance and the postoperative morbidity,mortality and hospital ***:A total of 225 patients underwent PD,of which 43(19.1%)patients were found to have eitheraccessory or replaced right hepatic arteries(aRHA group).The aRHA was preserved in 79%of the *** was no significant difference in the intraoperative blood loss but operative time was prolonged,reflecting the complexity of the procedure[420±44(240-540)min vs 480±45(300-600)min,P<0.05)].There were no differences in the incidence of postoperative complications(pancreatic leak,pancreatic fistula,delayed gastric emptying and mortality)and hospital *** clearance in the form of positive resection margins[13(7.1%)vs 3(6.9%)]and lymph node yield were also similar in the two ***:An aRHA is found in approximately one fifth of patients undergoing *** is technically possible in most patients and can increase the operative complexity but does not negatively affect the safety or oncological outcomes of the procedure.

关键词： Pancreatoduodenectomy Aberrant right hepatic artery Arterial anomalies Outcomes

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