Active Hybrid Solid State Transformer Based on Multi-Level Converter Using SiC MOSFET

Yun, Chun-Gi; Cho, Younghoon

doi:10.3390/en12010066

Cited by 12 publications

(14 citation statements)

References 19 publications

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“…In this case, the taps-side converter rectifies the tap voltage, then the end-side converter inverts it in order to generate the required AC voltage and injects it in series to the grid. No switches are required due to the fact that the capabilities of DC-AC converters to shift its output voltage waveform [73]. In previous configurations, load harmonics mitigation is not provided, which can affect and diminish the LFT lifetime.…”

Section: Additional Hdt Configurationsmentioning

confidence: 99%

Configurations, Power Topologies and Applications of Hybrid Distribution Transformers

et al. 2021

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Distribution systems are under constant stress due to their highly variable operating conditions, which jeopardize distribution transformers and lines, degrading the end-user service. Due to transformer regulation, variable loads can generate voltage profiles out of the acceptable bands recommended by grid codes, affecting the quality of service. At the same time, nonlinear loads, such as diode bridge rectifiers without power factor correction systems, generate nonlinear currents that affect the distribution transformer operation, reducing its lifetime. Variable loads can be commonly found at domiciliary levels due to the random operation of home appliances, but recently also due to electric vehicle charging stations, where the distribution transformer can cyclically vary between no-load, rated and overrated load. Thus, the distribution transformer can not safely operate under highly-dynamic and stressful conditions, requiring the support of alternative systems. Among the existing solutions, hybrid transformers, which are composed of a conventional transformer and a power converter, are an interesting alternative to cope with several power quality problems. This article is a review of the available literature about hybrid distribution transformers.

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Section: Additional Hdt Configurationsmentioning

confidence: 99%

Configurations, Power Topologies and Applications of Hybrid Distribution Transformers

et al. 2021

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“…Regarding the selection of the SiC devices for the DAB, 6.5, 10, and 15 kV SiC MOSFETs have been reported for laboratory prototypes [37][38][39][40][41][42], but are far from being a viable commercial alternative yet. Current ratings offered in commercially available 1.7 kV SiC MOSFETs are still limited [23], and their commutation characteristic must be improved.…”

Section: Sic Device Selectionmentioning

confidence: 99%

“…been reported for laboratory prototypes[37][38][39][40][41][42], but are far from being a viable commercial…”

mentioning

confidence: 99%

SiC-Based High Efficiency High Isolation Dual Active Bridge Converter for a Power Electronic Transformer

et al. 2020

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This paper discusses the benefits of using silicon carbide (SiC) devices in a three-stage modular power electronic transformer. According to the requirements to be fulfilled by each stage, the second one (the DC/DC isolation converter) presents the most estimable improvements to be gained from the use of SiC devices. Therefore, this paper is focused on this second stage, implemented with a SiC-based dual active bridge. Selection of the SiC devices is detailed tackling the efficiency improvement which can be obtained when they are co-packed with SiC antiparallel Schottky diodes in addition to their intrinsic body diode. This efficiency improvement is dependent on the dual active bridge operation point. Hence, a simple device loss model is presented to assess the efficiency improvement and understand the reasons for this dependence. Experimental results from a 5-kW Dual Active Bridge prototype have been obtained to validate the model. The dual active bridge converter is also tested as part of the full PET module operating at rated power.

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“…Nevertheless, using full rated converters, usually located after or before the DT as a standalone device, yields high losses for switching and conduction as well as requiring high maintenance. In order to bridge this research gap, several works have been published in the literature proposing to perform VAr compensation [18][19][20], voltage regulation [21,22], or even both [23,24] using reduced ratings for the SSS. In particular, the so-called hybrid distribution transformer (HT) [25][26][27], which consists of using an embedded fractional rated converter partially attached to the windings of the DT, has been widely used [19,20,23,24,28].…”

Section: Introductionmentioning

confidence: 99%

Control Configurations for Reactive Power Compensation at the Secondary Side of the Low Voltage Substation by Using Hybrid Transformer

et al. 2021

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The high penetration of new device technologies, such as Electric Vehicles (EV), and Distributed Generation (DG) in Distribution Networks (DNs) has risen new consumption requirements. In this context, it becomes crucial to implement a flexible, functional and fast responsive management of the voltage level and Reactive Power (RP) in the DN. The latest improvements in the Solid State Switches (SSS) field demonstrate they can be used as a Power Electronic (PE) converter. In particular, they have been shown to be capable of operating synchronously with transformers, making the Hybrid Distribution Transformer (HT) concept a potential and cost-effective solution to various DN control issues. In this paper, a HT-based approach consisting of augmenting the conventional Low Voltage (LV) transformer with a fractionally rated PE converter for regulating and controlling the RP in the last mile of the DN is proposed. In this way, it is expected to meet the demand of the future DN from an efficiency, controllability and volume perspective. The proposed approach is implemented using a back-to-back converter. In addition, a power transfer control topology is used to implement the proposed control of the RP injection that controls the voltage level at the Direct Current (DC) link. The proposed approach has been demonstrated in different load scenarios using the Piecewise Linear Electrical Circuit Simulation (PLECS) tool. The simulation results show that the proposed approach can compensate the loads with their need from RP instead of feeding them from the transmission grid at the primary side of the Distribution Transformer (DT). In this way, the proposed approach is able to decrease the transferred amount of RP in the transmission lines.

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Active Hybrid Solid State Transformer Based on Multi-Level Converter Using SiC MOSFET

Cited by 12 publications

References 19 publications

Configurations, Power Topologies and Applications of Hybrid Distribution Transformers

Configurations, Power Topologies and Applications of Hybrid Distribution Transformers

SiC-Based High Efficiency High Isolation Dual Active Bridge Converter for a Power Electronic Transformer

Control Configurations for Reactive Power Compensation at the Secondary Side of the Low Voltage Substation by Using Hybrid Transformer

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