A Level Enhanced Nearest Level Control for Modular Multilevel Converter Without Using Sensors

Gobburi, Hari Babu; Borghate, Vijay B.; Meshram, P. M.

doi:10.1109/tia.2023.3270113

Cited by 4 publications

(2 citation statements)

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“…• Higher complexities at higher number of levels Nearest level control [56] • Straightforward to implement • May not achieve perfect voltage balance Note that I x only determines the amplitude of Q tot,x , whereas the polarity remains identical. Since the value of Q tot,x in each graph is not always positive, voltage drifts are expected to take place in any n-level HCHB inverter when it is operated at various modulation indices and power factors.…”

Section: Balancing Methods Advantages Drawbacksmentioning

confidence: 99%

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Extension of Operating Range in Hybrid Cascaded H-Bridge Inverters with Capacitor Voltage Balancing Capability

Tirupathi,

Pribadi,

Kim

et al. 2024

Sensors

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In this article, a generalized control scheme is proposed to extend the operating range of three-phase hybrid cascaded H-bridge (HCHB) inverters into various voltage levels without necessitating alterations to the core structure or the integration of additional H-bridge submodules. This study addresses a critical challenge related to capacitor voltage drift at various modulation indices and power factors, which is a serious impediment to various applications. To overcome this challenge, a novel balancing control scheme has been developed based on the injection of two independent offset voltages to simultaneously control the DC-link and flying capacitors. A distinctive aspect of the proposed technique involves adjusting the common reference voltage to attain the nearest level in the same cluster, thereby mitigating the insufficiency of redundant switching states. The effectiveness of the proposed technique to regulate the capacitor voltages at various operating conditions has been verified through simulation and experimental results.

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Section: Balancing Methods Advantages Drawbacksmentioning

confidence: 99%

“…• Higher complexities at higher number of levels Nearest level control [56] • Straightforward to implement • May not achieve perfect voltage balance…”

Section: Balancing Methods Advantages Drawbacksmentioning

confidence: 99%