Hybrid Single-Phase AC–AC Modular Multilevel DSCC Converters With Modulation and DC-Link Voltage Ripple Improvement

Silva, Italo Roger F. M. P. da; Jacobina, Cursino B.; Oliveira, Alexandre C.

doi:10.1109/tia.2016.2603958

Cited by 5 publications

(1 citation statement)

References 28 publications

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“…In recent years, the various topologies for switched‐capacitor converters have received special attention from the researchers because they have a lower number of power components (see other studies 4–25 ). Generally, the switched capacitor‐based power converters are classified into four categories: (a) AC/direct current (DC) power converters, 9,10 (b) AC/AC power converters, 11,12 (c) DC/DC power converters, 13,14 and (d) DC/AC power converters. Furthermore, the voltage balancing of flying or floating capacitor of the switched capacitor MLI (SCMLI) topologies are also classified into two categories: (a) active voltage balancing and (b) natural voltage balancing.…”

Section: Introductionmentioning

confidence: 99%

Improved “K” type seven‐level switched capacitor inverter topology with Self‐voltage balancing

Ali

Sandeep

Almakhles

et al. 2020

Circuit Theory & Apps

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This paper proposes an improved "K" type seven-level switched capacitor inverter topology. The proposed topology consists of eight active switches, one floating capacitor, and two dc-link capacitors. The floating capacitors are charged and discharged in each half-cycle to maintain the capacitor voltage with the same value of the input voltage. The floating capacitor voltage is selfbalanced, and the output voltage is 1.5 times higher than the input voltage. To prove the superiority of the proposed topology, it is compared with the existing seven-level inverters in terms of maximum voltage stress on the switch and required the number of power components. The simulation and experimental validation are carried out for 1.6 kW, 50 Hz using a laboratory-based setup with a switching frequency of 5 kHz. The results are discussed highlighting the performance of the proposed topology for the dynamic load variations at different modulation indices. Both simulation results and experimental results have good agreement in terms of voltage balancing of flying capacitor. K E Y W O R D S multilevel inverter, voltage boosting, capacitor balancing and ANPC

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Section: Introductionmentioning

confidence: 99%

Improved “K” type seven‐level switched capacitor inverter topology with Self‐voltage balancing

Ali

Sandeep

Almakhles

et al. 2020

Circuit Theory & Apps

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Intelligent Transformer Tap Controller for Harmonic Elimination in Hybrid Distribution Network

Bhatt

Kaushik

2021

2021 5th International Conference on Electronics, Communication and Aerospace Technology (ICECA)

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Analysis and Assessment of Modular Multilevel Converter Internal Control Schemes

Wang

Adam

Massoud

et al. 2020

IEEE J. Emerg. Sel. Topics Power Electron.

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Adoption of distributed submodule (SM) capacitors in a modular multilevel converter (MMC) necessitates complex controllers to ensure the stability of its internal dynamics. This paper presents comprehensive analysis and assessment of different proportional resonant (PR)-based control schemes proposed to stabilize the internal dynamics and ensure ac and dc sides power quality of the MMC within a dc transmission system. With the consideration of passive component tolerances, different energy and voltage based control schemes under various conditions are analyzed. It has been established that without vertical voltage balance control, unequal passive component values in the upper and lower arms of the same phase-leg may cause: unbalanced fundamental currents in the arms, unequal dc voltage across the arms, and fundamental oscillations in the common-mode currents that lead to fundamental frequency ripple in the dc link current. The theoretical analysis that explains this mechanism is presented, and is used to show that vertical voltage balancing is necessary for the nullification of arm voltage difference and suppression of odd oscillations caused by capacitive/inductive asymmetry between arms of the same phase-leg. Simulations support the theoretical analysis and the effectiveness of voltage balancing in ensuring correct operation, independent of tolerances of the MMC passive elements and operating conditions. A new direct method for elimination of fundamental oscillations in the common-mode and dc link current is proposed. Experimental results from a singlephase MMC prototype validate the presented theoretical discussions and simulations.

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Hybrid Single-Phase AC–AC Modular Multilevel DSCC Converters With Modulation and DC-Link Voltage Ripple Improvement

Cited by 5 publications

References 28 publications

Improved “K” type seven‐level switched capacitor inverter topology with Self‐voltage balancing

Improved “K” type seven‐level switched capacitor inverter topology with Self‐voltage balancing

Intelligent Transformer Tap Controller for Harmonic Elimination in Hybrid Distribution Network

Analysis and Assessment of Modular Multilevel Converter Internal Control Schemes

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