Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 36, Issue 6, Pages 6774-6786Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2020.3037936
Keywords
Capacitors; Switches; Energy storage; Multilevel converters; Harmonic analysis; Power harmonic filters; Low voltage; Cell capacitor; dc-ac power converter; grid-connected converter; modular multilevel converter (MMC); Si-< sc xmlns:ali=http:; www; niso; org; schemas; ali; 1; 0; xmlns:mml=http:; www; w3; org; 1998; Math; MathML xmlns:xlink=http:; www; w3; org; 1999; xlink xmlns:xsi=http:; www; w3; org; 2001; XMLSchema-instance> MOSFET <; sc >
Categories
Ask authors/readers for more resources
The NPC-MMC can reduce the required energy storage by almost half compared to the conventional MMC, and further reduce its energy storage by injecting harmonic currents into the circulating current.
This article clarifies a required energy storage in a neutral-point-clamped modular multilevel converter (NPC-MMC) based on a theoretical analysis and an experimental verification to enable quantitative comparison of the size of the capacitors. The NPC-MMC consists of both a three-level structure with common dc capacitors and chopper cells. It can reduce the number of the chopper cells by half comparing to the conventional MMC. The theoretical analysis reveals that the NPC-MMC directly transfers a part of its power from the dc capacitors to the ac grid, whereas the conventional MMC transfers all of its power by way of the cells. Therefore, the NPC-MMC can reduce its required energy storage by almost half comparing to the MMC. Moreover, the NPC-MMC can further reduce its energy storage by injecting harmonic currents to its circulating current despite still smaller arm currents than the MMC. A 200-V 10-kVA experimental circuit using low-voltage MOSFET s validates the analysis and demonstrates that the NPC-MMC can achieve both downsizing and high efficiency.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available
© Peeref 2019-2024. All rights reserved.