Minimum-Backflow-Power Scheme of DAB-Based Solid-State Transformer With Extended-Phase-Shift Control

Shi, Haochen; Wen, Huiqing; Chen, Jie; Hu, Yihua; Jiang, Lin; Chen, Guipeng; Ma, Jieming

doi:10.1109/tia.2018.2819120

Cited by 180 publications

(56 citation statements)

References 38 publications

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“…Based on (16), the gain curves versus the normalized switching frequency for different inductance ratios k and load conditions Q are depicted in Fig. 6 (a) and (b), respectively.…”

Section: A Analysis Of the Gain Characteristicsmentioning

confidence: 99%

“…In [14], four typical topologies are compared, including DAB [15]- [16] and CLLC [17]- [18], and the results show that a half-bridge CLLC has obvious advantages in terms of current stress, transformation efficiency and hardware cost. Reference [5] introduces an integrated CLLC resonant circuit without an energy storage unit by integrating a Buck-Boost circuit and a CLLC resonant circuit using common switches.…”

Section: Introductionmentioning

confidence: 99%

“…Under the rated output power, Q is 0.055-0.221 according to different output voltages (200V-400V). Referring to(16) and(20), when the normalized switching frequency f n = [0.6,1], we know that the resonance gain is [0.976,1.251]-[0.999-1.526]. In the PFM-PWM hybrid modulation converter, at the duty cycle [0.3,0.7], the normalized switching frequency is f n =0.6 and the gain is [6.7,2.8].…”

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confidence: 99%

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A Boost CLLC Converter Controlled by PWM and PFM Hybrid Modulation for Photovoltaic Power Generation

Shi

Guo

et al. 2020

IEEE Access

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When an input terminal is connected to a solar panel with a low voltage level and large power range fluctuation, a Boost type CLLC converter controlled by fixed frequency pulse width modulation (PWM) reduces the utilization of PV electric energy, and the synchronous drive of the secondary side and primary side ensures that the converter operates with low efficiency when the duty cycle is shifted by 0.5. To maximize the utilization of photovoltaic (PV) energy in a PV power generation system and improve the conversion efficiency, this paper studies a Boost CLLC converter with high gain and soft switching controlled by PWM-pulse frequency modulation (PFM) hybrid modulation for PV power generation. By controlling the duty cycle and switching frequency of the primary MOSFETs, the converter can stabilize the output voltage while tracking the PV maximum power point. Under such a hybrid control, the resonant gain of the converter is greater than 1, the voltage gain is large, one of the MOSFETs at the primary side is in a zero-voltage-switching-open (ZVS-ON) state, two diodes are used to realize zerocurrent-switching (ZCS) soft switching on the secondary side, and the efficiency of the converter is high. In addition, this paper studies the phenomenon of backflow power in the resonant circuit and the influence of a change in the switching frequency on the magnitude of the backflow power. Finally, a 500W experimental prototype was constructed to verify the accuracy of the theoretical analysis and the feasibility of the control method.

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“…Based on (16), the gain curves versus the normalized switching frequency for different inductance ratios k and load conditions Q are depicted in Fig. 6 (a) and (b), respectively.…”

Section: A Analysis Of the Gain Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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A Boost CLLC Converter Controlled by PWM and PFM Hybrid Modulation for Photovoltaic Power Generation

Shi

Guo

et al. 2020

IEEE Access

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“…Combining (12) and (10), it can be derived that when Ds is equal to the minimal peak inductance current is achieved for a reference output power. Therefore, as a function of Dφ and k, (9) and (13) are the optimal Dp and Ds to reduce the backflow power and peak inductance current.…”

Section: Backflow Power and Peak Current Optimizationmentioning

confidence: 99%

“…Therein, the TPS modulation has the highest degree of freedom, and the other modulation methods can be seen as particular cases of the TPS. At the control level, several optimal control strategies can be found in [10]- [12] where reducing the rms value of the leakage inductance current [10], [11] and suppressing the backflow power [12] are commonly used optimization objectives. In most papers, usually one optimization objective is selected to enhance the converter performance.…”

Section: Introductionmentioning

confidence: 99%

An Optimized Control Scheme to Reduce the Backflow Power and Peak Current in Dual Active Bridge Converters

Liu

Blaabjerg

2019

2019 IEEE Applied Power Electronics Conference and Exposition (APEC)

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An optimized switching control scheme to reduce the backflow power and the peak current of the dual active bridge converter is presented in this paper. Based on a triplephase-shift modulation, the control scheme consists of operating the switching devices with three optimized control variables on the basis of achieving a decreased backflow power and peak current. This can enhance the converter efficiency and reduce the current stress on the switching devices. The optimal values of these three manipulated variables are obtained through analysis of different operation modes. Besides, the power transfer ranges and soft-switching constraints are also explained in detail. Experimental results are presented to validate the feasibility of the proposed method.

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Solid‐state transformers: An overview of the concept, topology, and its applications in the smart grid

Shadfar

Pashakolaei

Foroud

2021

Int Trans Electr Energ Syst

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The development of power systems and the move to smart grid have increased the need for new technologies. In this regard, solid-state transformers have been proposed as a suitable alternative to conventional transformers. Solidstate transformers are among the equipment based on power electronic converters that in addition to better performance than conventional transformers provide a variety of other services. In this article, the concept and types of solid-state transformer topologies and configurations and their applications, especially in smart grid, are investigated. Studies show that the various characteristics of solid-state transformers have led to much consideration as potential transformers in smart grid applications, the integration of distributed generation sources, modern traction systems, and so on.

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Minimum-Backflow-Power Scheme of DAB-Based Solid-State Transformer With Extended-Phase-Shift Control

Cited by 180 publications

References 38 publications

A Boost CLLC Converter Controlled by PWM and PFM Hybrid Modulation for Photovoltaic Power Generation

A Boost CLLC Converter Controlled by PWM and PFM Hybrid Modulation for Photovoltaic Power Generation

An Optimized Control Scheme to Reduce the Backflow Power and Peak Current in Dual Active Bridge Converters

Solid‐state transformers: An overview of the concept, topology, and its applications in the smart grid

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