Novel Static Carrier Based Low Frequency Multilevel Modulations With Long Conduction Time: Analysis Of Capacitor Voltage Balancing

Darbas, Corentin; Olivier, Jean-Christophe; Ginot, Nicolas; Poitiers, Frédéric

doi:10.1109/ecce47101.2021.9595679

Cited by 1 publication

(2 citation statements)

References 22 publications

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“…2. The second category is based on modulation strategies such as level-shifted pulse width modulation (LS-PWM), carrier phase-shifted pulse width modulation (CPS-SPWM) [19][20][21][22][23][24][25][26][27][28][29], nearest level modulation (NLM), hybrid NLM-PWM [30][31][32] and so on. It is difficult to achieve voltage balance under different working conditions only by different modulation strategies, thus still needing closed-loop control and capacitor voltage sampling.…”

Section: Introductionmentioning

confidence: 99%

“…These studies mainly focus on improving sorting efficiency and reducing switching frequency, whereas sacrificing capacitor voltage balancing effects to some extent. These strategies are all based on submodule capacitor voltage sampling and its closed‐loop feedback control, which are widely applied to high‐voltage engineering projects with a large number of submodules. The second category is based on modulation strategies such as level‐shifted pulse width modulation (LS‐PWM), carrier phase‐shifted pulse width modulation (CPS‐SPWM) [19–29], nearest level modulation (NLM), hybrid NLM‐PWM [30–32] and so on. It is difficult to achieve voltage balance under different working conditions only by different modulation strategies, thus still needing closed‐loop control and capacitor voltage sampling.…”

Section: Introductionmentioning

confidence: 99%

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A capacitor voltage self‐balancing method of modular multilevel converters based on switching state matrix construction

Zhou

Qin

Wang

et al. 2023

IET Power Electronics

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This study presents a submodule capacitor voltage self‐balancing method for modular multilevel converters (MMCs) based on switching state matrix construction, which has an advantage over eliminating massive sensor demanding and alleviating computational burden for a large number of submodules. It is mathematically proved that MMC has only one static equilibrium operating point to which the submodule capacitor voltages will converge naturally by the evaluation of capacitor voltage deviation index. A novel switching state matrix of submodules is constructed off‐line according to the mathematical proof, and the switching state vectors are cyclically selected from the matrix and distributed to the switching gate signals among the submodules to realize capacitor voltage self‐balance, avoiding real‐time capacitor voltage sampling and sorting. The proposed method is compatible with the conventional double closed‐loop control of MMCs. Theoretical conclusions are verified by simulations and experiments.

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