2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia) 2018
DOI: 10.23919/ipec.2018.8507731
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Abstract: Due to the parameter mismatch, the unbalanced power loss distribution among SMs in the modular multilevel converter (MMC) can be introduced and further deteriorated by the low-frequency asynchronous switching transients related to no-carrier modulation techniques. The unbalanced thermal stress can reduce the reliability of the MMC and increase the complexity of cooling system design. Nevertheless, an internal balance mechanism exists in the MMC thanks to the capacitor voltage balancing. It contributes to an ev… Show more

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Cited by 13 publications
(6 citation statements)
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“…The output voltage can be written as (23) After adding the current-balance loop, the per-phase duty cycles is deviated from D voltage and is represented below using the same procedure when deriving (10) and (11).…”
Section: A Extend DC Current Balance Analysis Of Cot Control With Cumentioning
confidence: 99%
“…The output voltage can be written as (23) After adding the current-balance loop, the per-phase duty cycles is deviated from D voltage and is represented below using the same procedure when deriving (10) and (11).…”
Section: A Extend DC Current Balance Analysis Of Cot Control With Cumentioning
confidence: 99%
“…To attain equal SM loss in the arm, various loss equalisation control techniques for the MMCs are proposed in [32–36]. A power loss distribution scheme based on CCs at dc voltage offset, fundamental frequency, and second‐harmonic components of the output waveform, which maintains equal losses between the upper and lower switches is introduced in [32].…”
Section: Introductionmentioning
confidence: 99%
“…In these schemes, switching losses balancing distribution for each power semiconductor in SM is not considered. In [34], a balanced control scheme is presented that evenly distributes conduction losses among SMs. However, the effect of switching loss and performance of the system under capacitor degradation is ignored.…”
Section: Introductionmentioning
confidence: 99%
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“…Besides the temperature, regulating power losses is also an alternative for thermal balancing control [14]. However, as revealed in [15], the submodule-level conduction losses among SMs are well balanced regardless of the operation condition, the modulation techniques and the parameter mismatch under the circumstance of balanced SM capacitor voltages. It can be readily achieved by various voltage balancing control (VBC) strategies.…”
Section: Introductionmentioning
confidence: 99%