Solid-State Transformer Architecture Using AC–AC Dual-Active-Bridge Converter

Qin, Hengsi; Kimball, Jonathan W.

doi:10.1109/tie.2012.2204710

Cited by 268 publications

(80 citation statements)

References 36 publications

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“…Fig. 17 shows a Type A topology based on DAB and four-quadrant switch cells [34]. The converter can operate at high frequency and efficiency due to its ZVS capability.…”

Section: Ac-ac Applicationsmentioning

confidence: 99%

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15 kV SiC MOSFET: An Enabling Technology for Medium Voltage Solid State Transformers

et al. 2017

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Abstract-Due to much higher achievable blocking voltage and faster switching speed, power devices based on wide bandgap (WBG) silicon carbide (SiC) material are ideal for medium voltage (MV) power electronics applications. For example, a 15 kV SiC MOSFET allows a simple and efficient two-level converter configuration for a 7.2 kV solid state transformer (SST) for smart grid applications. Compared with multilevel input series and output parallel (ISOP) solution, this approach offers higher efficiency and reliability, reduced system weight and cost by operating at medium to high switching frequency. However, the main concern is how to precisely implement this device in different MV applications, achieving highest switching frequency while maintaining good thermal performance. This paper reviews the characteristics of 15 kV SiC MOSFET and offers a comprehensive guideline of implementing this device in practical MV power conversion scenarios such as AC-DC, DC-DC and AC-AC in terms of topology selection, loss optimization and thermal management.Index Terms-15 kV SiC MOSFET, efficiency, medium voltage, medium voltage power electronics, reliability, solid state transformer, smart transformer.

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“…Fig. 17 shows a Type A topology based on DAB and four-quadrant switch cells [34]. The converter can operate at high frequency and efficiency due to its ZVS capability.…”

Section: Ac-ac Applicationsmentioning

confidence: 99%

“…Due to these benefits, several efforts on Type A SST have been carried out [11], [29], [34]. In Type A SST, the MV device will experience a wide voltage range, from 0 to 10 kV during one line frequency cycle in case of a 7.2 kVac input.…”

Section: Introductionmentioning

confidence: 99%

15 kV SiC MOSFET: An Enabling Technology for Medium Voltage Solid State Transformers

et al. 2017

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“…The ST is a 3-stage converter composed of grid connected converters at the LV and MV grid interfaces and a Dual Active Bridge (DAB) converter [11]. The DAB has the task to transform the voltage from MV to LV by means of an high frequency transformer (within the range of several kHz).…”

Section: St Concept and Controlmentioning

confidence: 99%

Frequency-Based Overload Control of Smart Transformers

Carne

Buticchi

Liserre

et al. 2015

2015 IEEE Eindhoven PowerTech

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Abstract-A Smart Transformers (ST) is an automated transformer based on the latest power electronics and communication technologies. It aims not only at replacing the traditional transformer, but at providing also ancillary services to the grid, thanks to the greater flexibility offered by power electronics. However, in the case of grid overload caused by high load demand or high production from renewable energy sources, the power electronics have no extra capability. The power semiconductors can be overloaded only for few microseconds, in contrast with the grid components requirement of bearing currents higher than the rated values for several seconds. Thus the ST needs new procedures for dealing with the transients/conditions of the high current requests by the load. This paper presents the FrequencyBased Overload Control (FBOC), an innovative procedure for the overload management that acts in coordination with the droop controller of Distributed Generation (DG) systems, enabling the limitation of the transformer current.

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“…magnitude of the transformer primary voltage v T1 transient value of the transformer primary voltage V T2 magnitude of the transformer secondary voltage v T2 transient value of the transformer secondary voltage I S1 rms current produced by V S1 I L_rms rms current flowing through the inductor L V L_rms rms voltage across the inductor L Q L reactive power produced by the inductor L I peak peak current of the inductor L I peak_min minimum value of I peak I rms_min minimum value of I L_rms I peak_min_G global minimum value of I peak I peak_min_L local minimum value of I peak INTRODUCTION Originally proposed in [1] for aerospace power applications, the topology of a dual active bridge (DAB) converter became popular in battery chargers [2], hybrid wind-photovoltaic systems [3], solid-state transformers (SSTs) [4], micro grids [5], and hybrid electric vehicles [6]. Compared with other isolated dc-dc topologies, the DAB converter shows many advantages, such as bi-directional power flow, inherent soft-switching capability, power controllability and high efficiency [7].…”

Section: T1mentioning

confidence: 99%

Reactive Power and Soft-Switching Capability Analysis of Dual-Active-Bridge DC-DC Converters with Dual-Phase-Shift Control

Wen¹,

Su²

2015

Journal of Power Electronics

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This paper focuses on a systematical and in-depth analysis of the reactive power and soft-switching regions of Dual Active Bridge (DAB) converters with dual-phase-shift (DPS) control to achieve high efficiency in a wide operating range. The key features of the DPS operating modes are characterized and verified by analytical calculation and experimental tests. The mathematical expressions of the reactive power are derived and the reductions of the reactive power are illustrated with respect to a wide range of output power and voltage conversion ratios. The ZVS soft-switching boundary of the DPS is presented and one more leg with ZVS capability is achieved compared with the CPS control. With the selection of the optimal operating mode, the optimal phase-shift pair is determined by performance indices, which include the minimum peak or rms inductor current. All of the theoretical analysis and optimizations are verified by experimental tests. The experimental results with the DPS demonstrate the efficiency improvement for different load conditions and voltage conversion ratios.

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Solid-State Transformer Architecture Using AC–AC Dual-Active-Bridge Converter

Cited by 268 publications

References 36 publications

15 kV SiC MOSFET: An Enabling Technology for Medium Voltage Solid State Transformers

15 kV SiC MOSFET: An Enabling Technology for Medium Voltage Solid State Transformers

Frequency-Based Overload Control of Smart Transformers

Reactive Power and Soft-Switching Capability Analysis of Dual-Active-Bridge DC-DC Converters with Dual-Phase-Shift Control

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