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Duc Dung Le,Dong-Choon Lee 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a modified hybrid modular multilevel converters based on half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs) for mediumvoltage applications. The FBSMs are used to reduce the submodule (SM) capacitor voltage fluctuations in low fundamental frequency operations by balancing the power difference between the upper and lower arms through flying inductors without the common-mode voltage injected. In addition, the FBSM can substitute a faulty HBSM if a failure in HBSM is detected and then the converter keeps its operation continuously. The viability of the proposed topology as well as the effectiveness of the control scheme have been confirmed by the simulation and experiment results.
Duc Dung Le,Sihyeong Hong,Dong-Choon Lee 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.6
In this paper, an IGBT open-circuit fault detection and fault-tolerant control strategy are proposed for a fl ying-capacitor modular multilevel converter (FC-MMC) feeding induction motor drives. Fault occurrence is detected by monitoring the sum of measured AC-circulating currents. In the fault case, the phase with the faulty device is identifi ed through the errors between the measured and estimated output currents of the converter. In this phase, then, a localization of a faulty submodule (SM) is performed by investigating the SM capacitor voltages. Thereafter, the fault-tolerant control method is applied to reconfi gure the converter structure, where the faulty SM is isolated and the converter can operate as normal. In addition, an SM capacitor voltage-balancing control scheme is proposed, where the number of current sensors is reduced to six from nine. Therefore, the system cost is lowered, and the communication burden is lightened. The viability of the proposed control scheme is confi rmed by experimental results for an FC-MMC-fed induction motor drive system.
The Impact of Cash Flow Statement on Lending Decision of Commercial Banks: Evidence from Vietnam
Dung Duc NGUYEN,Anh Huu NGUYEN 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.6
The paper investigates the impact of the statement of cash flows of listed companies on lending decisions of commercial banks in the context of Vietnam. Survey data for the research were collected from 160 credit officers of Vietnamese commercial banks for short-term and long-term lending decisions, whether the cash flow statement includes complete information or has a lack of information. The cash flow statement, in which the information on the cash flow is completely contrary to the profit information on the income statement is examined. This paper employed T-tests to address the research issues in a market considered to be ineffective, like Vietnam. The research results show: (1) the information on the cash flow statement affects both the short-term and long-term lending decisions of credit officers, and (2) the lack of information on the cash flow statement in both cases of positive and negative profits affects the comfort and confidence of credit officers in making decisions. The research findings also indicate that cash flow statements are important for lending decisions of credit institutions in Vietnam. Therefore, this paper provides a new insight to managers on how to improve the quality of cash flow statement to meet the needs of lenders.