Journal
2022 IEEE 7TH SOUTHERN POWER ELECTRONICS CONFERENCE, SPEC
Volume -, Issue -, Pages -Publisher
IEEE
DOI: 10.1109/SPEC55080.2022.10058272
Keywords
Electric vehicles (EV); modular multilevel converters (MMC); state-of-charge balancing; motor drive
Funding
- UC Energy Research Center of Pontificia Universidad Catolica de Chile
- [ANID/PIA/ACT192013]
- [ANID/FONDECYT/1220928]
- [ANID/FONDAP/15110019]
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This paper proposes a method to control the powers of each MMC cluster during low ac voltage operation by using high-frequency circulating currents, which performs better in electric vehicle applications compared to the current methods.
MMCs with integrated energy storage systems in their sub-modules look attractive for some applications, but present the challenge of controlling the powers of each cluster independently. Several methods have been proposed using the ac port voltage to produce internal power flow, requiring high internal currents at low ac voltage operation, which can be a disadvantage in electric vehicle applications. This paper proposes a method to operate each MMC cluster with independent powers during low ac voltage operation, using high-frequency circulating currents instead of the fundamental frequency, and a common-mode voltage of the same high frequency. Simulation results show a reduction of 84% in circulating currents when the converter is operating at 10% of its rated power, reducing the conduction losses. Therefore, the proposed method is a good complement to conventional methods, which perform better at high voltage operation.
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