Journal
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
Volume 6, Issue 3, Pages 1540-1552Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2017.2784426
Keywords
DC grid; dc/dc power conversion; high-voltage direct current (HVDC) transmission; modular multilevel converter (MMC)
Categories
Funding
- National Natural Science Foundation of China [51677117]
- State Grid Corporation of China Science and Technology Project [NYN17201600314]
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Modular dc/dc converter (MDCC) based on cascaded submodules (SMs) has been an attractive converter topology for the interconnection of high-voltage dc (HVDC) grids for its low cost and high efficiency. The MDCC with sine-wave modulation has been developed and poses satisfactory performance; however, the high-frequency sorting of SM capacitor voltages, which aims to achieve their balance, results in quite large computation burden in HVDC application. To resolve the problem, the stepped two-level operation of the MDCC is proposed in this paper. Compared with the traditional sine-wave modulation, the stepped two-level modulation offers the following merits: 1) smaller SM capacitance requirement; 2) smaller ac circulating current; 3) the switching frequency is equal to the fundamental frequency, which avoids the extra switching actions existing in the sine-wave modulation; and 4) the sorting algorithm of the SM capacitor voltages needs only to be executed twice in a period, which poses a significant reduction of the computation burden, especially for ultrahigh voltage power conversion requiring hundreds of SMs. The simulation and experimental results verify the theoretical analysis.
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