Journal
IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY-TRANSACTIONS OF ELECTRICAL ENGINEERING
Volume -, Issue -, Pages -Publisher
SPRINGER INT PUBL AG
DOI: 10.1007/s40998-023-00621-w
Keywords
MMC; Voltage ripple; Capacitor parallel connection; Three-level submodule
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This paper proposes a new submodule (SM) that enables the parallel connection of capacitors, reducing the ripple of the capacitors and providing three-level voltage at its terminals. It uses fewer switching devices and gate driver circuits compared to other submodules presented in the literature. Additionally, the number of capacitor voltage sensors is reduced by half due to the parallel connection of SM capacitors. The simulation and experimental results confirm the performance of the proposed submodule.
The size of energy storage resources has a vital role in the cost, size, and weight of power electronics converters. Multilevel converters usually operate at low switching frequencies to prevent high switching loss. Since modular multilevel converters are constructed of a series connection of some submodules, a lower switching frequency causes a higher capacitor voltage ripple. To deal with this issue, the size of converter capacitors has to be increased. This paper presents a new submodule (SM) that enables the parallel connection of capacitors. This SM decreases the ripple of the capacitors and offers three-level voltage at its terminals. In addition, it uses fewer switching devices and gate driver circuits in comparison with other submodules presented in the literature. Also, the number of capacitor voltage sensors is reduced by half due to the parallel connection of SM capacitors. The simulation and experimental results verify the performance of the proposed submodule.
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