Current Observation and Voltage Prediction Scheme for a Reduced Sensor based Medium Voltage MMC

Chaki, R and Dey, A (2024) Current Observation and Voltage Prediction Scheme for a Reduced Sensor based Medium Voltage MMC. In: IEEE Transactions on Industry Applications .

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Abstract

The reduced sensor operation of a Modular Multilevel Converter (MMC) lowers hardware complexity and failure rates resulting from malfunctioning sensors. Hence, in medium voltage applications, the reduced sensor operation may increase the appeal of MMC. A large number of individual submodule capacitor voltage sensors and three-phase arm current sensors are eliminated in this work for the internal control of MMC. Nevertheless, a well-designed arm current observer is utilized in a direct leg modulation scheme appropriate for medium voltage applications. The computational complexity of the proposed observer is low and the execution time remains fixed irrespective of the increase in submodules of MMC. The submodule capacitor voltage prediction is based on a simple logical approach using a single arm voltage measurement. The proposed reduced sensor operation of MMC is validated using steady state and transient studies, based on both simulations and hardware experiments after considering certain variations in submodule capacitances. Moreover, an online arm inductance and submodule capacitance monitoring is performed to encounter the degradation of parameters over a period of time. © 1972-2012 IEEE.

Item Type:	Journal Article
Publication:	IEEE Transactions on Industry Applications
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to the publisher.
Department/Centre:	Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited:	23 Oct 2024 17:38
Last Modified:	23 Oct 2024 17:38
URI:	http://eprints.iisc.ac.in/id/eprint/86621

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