期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 38, 期 6, 页码 7256-7270出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2023.3249463
关键词
Modulation; Voltage; Switches; Transformers; DC-DC power converters; Power harmonic filters; HVDC transmission; Capacitive energy storage; dc-dc converter; dual-active bridge; high voltage direct current (HVdc) transmission; modular multilevel converter (MMC); multilevel system
This article introduces the extended overlap modulation technique in MMDC to reduce the need for dc-link filters. The change in overlap angle affects the conduction states, component sizing, harmonic spectrum, and other converter parameters. Simulation and analytical studies analyze the effect of change in overlap duration on the size of submodule capacitor and dc-link filter. A single-stage three-phase MMC experimental setup is built to verify the converter operation in both SO and EO modulations.
The modular multilevel converter (MMC) based dc-dc converters (MMDCs) are essential for voltage matching, galvanic isolation, renewable integration, and other applications in high voltage direct current systems. The trapezoidal modulation in these converters has been a proven advantage owing to reduced capacitive requirement and high power density. However, the existing short overlap (SO) trapezoidal modulation technique presents significant dc-link current ripples requiring bulky dc-link filter. This article introduces an extended overlap (EO) modulation technique in MMDC to mitigate the need of dc-link filters. The change in overlap angle alters the conduction states, component sizing, harmonic spectrum, and other converter parameters. Therefore, a detailed mathematical analysis of MMDC with both SO and EO modes of trapezoidal modulation is carried out in this article. The effect of change in overlap duration on size of submodule capacitor, dc-link filter is analyzed by simulation and analytical studies. A single-stage three-phase MMC experimental setup is built to verify the converter operation in both SO and EO modulations.
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