Design Guidelines of Circuit Parameters for Modular Multilevel Converter with H-bridge Cell

Nakanishi, Toshiki; Itoh, Jun‐ichi

doi:10.1541/ieejjia.6.231

Cited by 16 publications

(6 citation statements)

References 32 publications

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“…where sw is the carrier angular frequency, Jn(•) is the Bessel function of the first kind, =2 1/2 Vg/NVc. Since the switching function is a PWM signal for the upper switch of the cell, the capacitor current is a product of the arm current iarm,u in (2) and the switching function scell in (4), as shown in (5). Eq.…”

Section: Operation Analysis Of Cell Capacitor In MMCmentioning

confidence: 99%

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Online Cell Capacitance and ESR Monitoring Using Switching Frequency in a Modular Multilevel Converter

2023

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A cell capacitor is one of the most fragile components in a modular multilevel converter (MMC). Capacitance decreases and equivalent series resistance (ESR) increases, as the capacitor deteriorates. This paper proposes an online monitoring method for both the capacitance and ESR of the cell capacitors in an MMC without any additional components or operation. The proposed method measures the impedance of the cell capacitor not only at a low frequency but also at a switching sideband-frequency of the cell without current sensors for capacitor current. The high-frequency components around the switching frequency improve the estimation accuracy compared with the previous methods that measure only impedance at low frequencies. The experimental results confirm that the proposed method estimates the capacitance and ESR with errors of 3.1% and 8.8%, respectively.

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Section: Operation Analysis Of Cell Capacitor In MMCmentioning

confidence: 99%

“…The MMC is applicable to any voltage ratings by adjusting the number of cells connected in series (1)- (3) . In addition, the multilevel operation with the stacked cell reduces or eliminates output filters (4) (5) .…”

Section: Introductionmentioning

confidence: 99%

Online Cell Capacitance and ESR Monitoring Using Switching Frequency in a Modular Multilevel Converter

2023

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“…Therefore, the core that satisfies conditions in (21) and (22) is selected. Thus, the core which has following parameters was selected according to (20); A e = 150 mm 2 , l e = 56.5 mm, and μ e = 229.…”

Section: Design Example Of One-turn Transformermentioning

confidence: 99%

Experimental Verification of Self-Supplying Power Circuit using One-Turn Transformer for Gate Drive Unit

2019

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This paper proposes a power supply circuit for gate drive units (GDUs) that uses a one-turn transformer, which gives advantages in terms of cost and loss reduction. The structure of the proposed one-turn transformer consists of a primary winding in which the number of turns is one and a secondary winding in which there are multiple number of turns. The proposed one-turn transformer is connected in series with a switching device of the main circuit in order to obtain power for the GDUs. The proposed power supply circuit can be applied to all types of main circuit topologies such as a multilevel converter topology or matrix converters, in addition to a conventional six-arm inverter. In this paper, the design method of the one-turn transformer and its characteristics are described based on an equivalent circuit and fundamental experimental results with a step-down chopper. Besides, the proposed power supply circuit for GDUs is tested in a two-level three-phase inverter. Secondly, the obtained power for GDUs from the proposed one-turn transformer with three connection points is investigated by harmonics analysis from the viewpoint of core size and other parameters. Finally, experimental results confirm that the GDU in the two-level three-phase inverter with switching frequencies of 12.5 kHz and 16 kHz is operated by the proposed self-supplying gate power supply circuit without an external power source.

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“…A multiport EV charger can change the charging power according to the state of charge or a charging schedule. Directly integrating the loads or sources into cascaded cells allows downsizing of the ac filtering requirements due to multilevel operation (6)- (8) and a reduction of cable length and cross section (5) .…”

Section: Introductionmentioning

confidence: 99%

“…The multiport converter in this study is driven using phase-shifted PWM (PS-PWM) (8) (11) . In the PS-PWM, the power imbalance among the cells in a given arm is compensated by injecting a compensation term into the cell ac voltage references (12)- (17) .…”

Section: Introductionmentioning

confidence: 99%

Intra-arm Balancing Control for Modular Multilevel Converter with Cell Loading Operated under High Power Imbalances

Yasuda,

Itoh,

Guidi

et al. 2024

IEEJ Journal IA

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Multiport converters with a large number of ports have been explored for integrated generation units or batteries. An attractive candidate multiport converter has been developed based on the modular multilevel converter (MMC) with cell loading. Accordingly, this study proposes a control strategy for a multiport converter based on the MMC operated under high power imbalances among cells. Owing to this power imbalance, the multiport converter requires an additional circulating current (intra-arm balancing current) to provide balanced three-phase grid currents and balanced capacitor voltages in all cells. In a previous study, the minimum required intra-arm balancing current was calculated offline and applied according to the loading condition. This method may require a highcapacity memory for the controller. In contract, this study proposes an active control method for minimizing the intra-arm balancing current online. Experimental results reveal that the multiport converter achieves balanced three-phase currents with a total harmonic distortion of 3.13% and balanced capacitor voltages with an error of 0.1% under maximum power imbalance among cells.

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Design Guidelines of Circuit Parameters for Modular Multilevel Converter with H-bridge Cell

Cited by 16 publications

References 32 publications

Online Cell Capacitance and ESR Monitoring Using Switching Frequency in a Modular Multilevel Converter

Online Cell Capacitance and ESR Monitoring Using Switching Frequency in a Modular Multilevel Converter

Experimental Verification of Self-Supplying Power Circuit using One-Turn Transformer for Gate Drive Unit

Intra-arm Balancing Control for Modular Multilevel Converter with Cell Loading Operated under High Power Imbalances

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