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Subacute thyroiditis after receiving the vaccine for COVID-19: a case report and literature review
Thanh Binh Vu,Dinh Toi Chu,Dinh Tuan Le,Thi Thuy Dieu Hoang,Philippe Gautret,Van Thuan Hoang 대한백신학회 2022 Clinical and Experimental Vaccine Research Vol.11 No.2
A 38-year-old female patient, with healthy history, was vaccinated with ChAdOx1 nCoV-19 (Astra Zeneca Cambridge, UK). Five days after the second injection, the patient presented headache, vertigo, then fatigue, nervousness, palpitations, shortness of breath, small amplitude tremors, and sweating episodes. Laboratory investigation revealed a suppressed thyroid-stimulating hormone (TSH), with elevated free thyroxine. However, the TSH receptor antibody and anti-thyroid peroxidase antibody were normal and thyroid-stimulating immunoglobulin negative. The patient was maintained on Metoprolol, and no specific treatment was added. After 3 months of following, the patient now feels comfortable. Our literature review found that 21 cases of subacute thyroiditis (SAT) following coronavirus disease 2019 (COVID-19) vaccines were reported. Most patients were young women who presented neck pain and systemic symptoms, with or without fever. These symptoms can appear as early (3 to 5 days), or later (1 month) after vaccination, regardless of vaccine type and mechanism of action. Laboratory tests showed decreased levels of TSH and elevated thyroid hormone. The mechanism of this event remains unknown. Further study is recommended to investigate the possible predisposing factors to developing SAT after receiving the COVID-19 vaccine.
Control Strategy for Accurate Reactive Power Sharing in Islanded Microgrids
Xuan Hoa Thi Pham,Toi Thanh Le 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
This paper presents a control strategy to enhance the accuracy of reactive power sharing between paralleled three-phaseinverters in an islanded microgrid. In this study, the mismatch of power sharing when the line impedances have significantdifferences between inverters connected to a microgrid has been solved, the accuracy of the reactive power sharing in an islandedmicrogrid is increased, the voltage droop slope is tuned to compensate for the mismatch of voltage drops across the lineimpedances by using an enhanced droop controller. The proposed method ensures accurate power sharing even if the microgridhas local loads at the output of the inverters. The control model has been simulated by MATLAB/Simulink with two or threeinverters connected in parallel. Simulation results demonstrate the accuracy of the implemented control method. Furthermore, inorder to validate the theoretical analysis and simulation results, an experimental setup was built in the laboratory. Resultsobtained from the experimental setup verify the effectiveness of the proposed method.
Control Strategy for Accurate Reactive Power Sharing in Islanded Microgrids
Pham, Xuan Hoa Thi,Le, Toi Thanh The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.4
This paper presents a control strategy to enhance the accuracy of reactive power sharing between paralleled three-phase inverters in an islanded microgrid. In this study, the mismatch of power sharing when the line impedances have significant differences between inverters connected to a microgrid has been solved, the accuracy of the reactive power sharing in an islanded microgrid is increased, the voltage droop slope is tuned to compensate for the mismatch of voltage drops across the line impedances by using an enhanced droop controller. The proposed method ensures accurate power sharing even if the microgrid has local loads at the output of the inverters. The control model has been simulated by MATLAB/Simulink with two or three inverters connected in parallel. Simulation results demonstrate the accuracy of the implemented control method. Furthermore, in order to validate the theoretical analysis and simulation results, an experimental setup was built in the laboratory. Results obtained from the experimental setup verify the effectiveness of the proposed method.