PWM Switching Technique for Three-Phase Bidirectional Grid-Tie DC–AC–AC Converter With High-Frequency Isolation

Sayed, Mahmoud A.; Suzuki, Kazuhiro; Takeshita, Toru; Kitagawa, Wataru

doi:10.1109/tpel.2017.2668441

Cited by 78 publications

(39 citation statements)

References 37 publications

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“…A direct stage conversion (AC-AC) is the second option to transform an MF-AC voltage to low-frequency AC voltage [39][40][41][42][43]. In reference [44], a direct method conversion was implemented.…”

Section: Introductionmentioning

confidence: 99%

A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link

et al. 2021

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Cascaded multilevel converters based on medium-frequency (MF) AC-links have been proposed as alternatives to the traditional low-voltage inverter, which uses a bulky low-frequency transformer step-up voltage to medium voltage (MV) levels. In this paper, a three-phase cascaded DC-AC-AC converter with AC-link for medium-voltage applications is proposed. Three stages integrate each DC-AC-AC converter (cell): a MF square voltage generator; a MF transformer with four windings; and an AC-AC converter. Then, k DC-AC-AC converters are cascaded to generate the multilevel topology. This converter’s topological structure avoids the per-phase imbalance; this simplifies the control and reduces the problem only to solve the per-cell unbalance. Two sets of simulations were performed to verify the converter’s operation (off-grid and grid-connected modes). Finally, the papers present two reduced preliminary laboratory prototypes, one validating the cascaded configuration and the other validating the three-phase configuration.

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Section: Introductionmentioning

confidence: 99%

A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link

et al. 2021

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“…9, No. is proposed in [12]- [14], where the duty cycle of both secondary and primary active devices keeps 0.5 and the phaseshift angle between secondary and primary devices is selected as the freedom to control and regulate the output voltage.…”

Section: Introductionmentioning

confidence: 99%

Single Input Single Output Two Level Isolated Dc-Dc Converter With Secondary Side Phase Shifting For Solar Applications

Babu¹

2021

ITII

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The isolated dc–dc converters with primary-side phase shifting (PPS) provides severely narrow soft-switching range for main devices in the primary side leg of full bridge converter. The leakage inductance of the high frequency transformer should be large enough for providing the energy needed for soft switching operations and also the idling power loss due to circulating current in the converter legs under large phase-shift angle, which makes reduction of conversion efficiency and complicated in designing the parameters of transformer. Furthermore, the turn-off diode commutations in the output-side rectifier are performed by hard-switching mode. To overcome all these drawbacks, a secondary side phase shifting (SPS) technique has been developed for two-level isolated DC-DC converter. This scheme provides wider soft switching range and reduced power loss due to elimination of circulating current in the primary side of high frequency transformer. In addition, SPS control also provide no reverse recovery current in diodes and hence no power losses in the secondary rectifier circuit. The control switches operate under soft switching even under rated load and short circuit conditions.

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“…In [8] and [9], HFL-MC is divided into two full-bridge inverters based on De-Re-coupling idea and a novel integration SPWM strategy is proposed, which achieved HFL-MC adaptive one-step commutation. In [10], a new PWM switching technique for three-phase grid-tie HFL-MC is proposed. This special SPWM strategy minimizes the number of switching transitions of the MC, and has the merits of high-power density and high efficiency compared with the conventional one.…”

Section: Introductionmentioning

confidence: 99%

“…(9) and(10), the voltage between the bus p and the point a is obtained in duty cycle da( ) Fig.3, the voltage of switch Sap1 is equal to upa. Thus, This work is licensed under a Creative Commons Attribution 4.0 License.…”

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confidence: 99%

A Novel Carrier-Based PWM Without Narrow Pulses Applying to High-Frequency Link Matrix Converter

et al. 2020

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In order to eliminate narrow pulses completely, this paper presents a novel carrier-based pulse width modulation (CBPWM) strategy applying to high-frequency link matrix converter (HFL-MC). Following the De-Re-couple idea, a singlephase to three-phase MC is equivalent to two full-bridge inverters according to the polarity of input voltage. The voltage of switches in two full-bridge inverters is analyzed and derived the duty cycles of switches according to the relationship between the state and the voltage of the switch. The duty cycles of three phases in the two inverters are integrated into a unified expression to generate the final modulation waves. A dual modulation strategy is proposed to compare modulation waves and a triangular carrier, which can achieve almost constant duty cycle of gating signals regardless of output voltage change. Therefore, the narrow pulses are eliminated fundamentally. Finally, the experimental results are given to show the advantages and the effectiveness of the proposed modulation strategy. INDEX TERMS Matrix converter, High-frequency link, Narrow pulses elimination, Carrier-based pulse width modulation

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PWM Switching Technique for Three-Phase Bidirectional Grid-Tie DC–AC–AC Converter With High-Frequency Isolation

Cited by 78 publications

References 37 publications

A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link

A Cascaded DC-AC-AC Grid-Tied Converter for PV Plants with AC-Link

Single Input Single Output Two Level Isolated Dc-Dc Converter With Secondary Side Phase Shifting For Solar Applications

A Novel Carrier-Based PWM Without Narrow Pulses Applying to High-Frequency Link Matrix Converter

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