Comparison of Classical and Smart Transformers Impact on MV Distribution Grid

Milczarek, Adam; Malinowski, Mariusz

doi:10.1109/tpwrd.2019.2941641

Cited by 31 publications

(11 citation statements)

References 29 publications

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“…Applying 6into (8) and integrating at the grid period T g (9), is how the average value of the output i o current (I o,avg_T g ) of the module is determined (10).…”

Section: B Static Gainmentioning

confidence: 99%

“…The average value of the load's rectified |i Ro | current shown in Fig. 4(g), which is determined in (11), must be equal to the average value I o,avg_T g of the module's output current (10). Then, equating (10) and (11), the peak value I Lr,pk_T g of the i Lr current is found (12).…”

Section: B Static Gainmentioning

confidence: 99%

“…The first technical report of an SST dates back 50 years, but only in the past few decades has it been getting real attention [3], as consequences of: the wide band gap semiconductors technologies improvements, the smart grid concept rise, the renewable energy growth and the new application areas of the SST. There are many different designators in the literature that refer to SSTs according to each area of application, such as: Universal Power Electronics [4]; IUT -Intelligent Universal Transformer [5]; ECC -Energy Control Center [6]; Energy Router [7]; PETT -Power Electronics Traction Transformer [8]; ST -Smart Transformer [9], [10].…”

Section: Introductionmentioning

confidence: 99%

“…The SSTs in MV grid applications remain as academic research (PES-ETHz [13], [23], FREEDM [24]- [26] and CAU-Kiel [9], [27]), but industry applications can be found, such as in [28], [29] from General Electric (GE), and a mixed consortium among industry and university (UNIFLEX [30], [31]). There is a consensus among many authors that the SSTs on power grid applications are still a major challenge [10], [11], [13], [23], [32].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Solid-State Transformer for Power Distribution Grid Based on a Hybrid Switched-Capacitor LLC-SRC Converter: Analysis, Design, and Experimentation

Silva¹,

Borges²,

Possamai³

et al. 2020

IEEE Access

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A solid-state transformer (SST) is being proposed for a distribution grid of 13.8 kV/380 V. The SST is based on the input-series output-parallel (ISOP) arrangement of twelve modules using the 1.2 kV SiC switches. The cost and losses analysis are discussed through a case study regarding the number of modules using the 1.2 kV and 1.7 kV SiC switches. The modules are composed of two stages: the first one is an AC-|AC| low-frequency rectifier and the second one is an |AC|-|AC| medium frequency Hybrid Switched-Capacitor LLC Series-Resonant Converter (HSCSRC). A single back-end |AC|-AC lowfrequency inverter is employed to generate the low voltage AC output port of the SST. The switched capacitor ladder cell in the HSCSRC converter enables the reduction of the number of modules employed on the ISOP arrangement because the voltage stresses on the MV side's switches are halved, while the resonant stage increases the efficiency of the structure due to soft-switching on all the switches. Moreover, the front-end AC-|AC| and back-end |AC|-AC low-frequency converters enable the use of two-quadrant switches on the |AC|-|AC| HSCSRC converter, reducing the switch count on the medium frequency stage. The operating behavior and design methodology of the SST's modules are presented. A single module reduced scale prototype with the rated power of 1.67 kVA and an input voltage of 1.15 kV and an output voltage of 220 V is experimentally verified. The maximum efficiency is 97%. INDEX TERMS Solid-state transformer, series-resonant converter (SRC), LLC converter, switchedcapacitor converter, AC-AC converter, soft-switching.

show abstract

“…Applying 6into (8) and integrating at the grid period T g (9), is how the average value of the output i o current (I o,avg_T g ) of the module is determined (10).…”

Section: B Static Gainmentioning

confidence: 99%

Section: B Static Gainmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Solid-State Transformer for Power Distribution Grid Based on a Hybrid Switched-Capacitor LLC-SRC Converter: Analysis, Design, and Experimentation

Silva¹,

Borges²,

Possamai³

et al. 2020

IEEE Access

View full text Add to dashboard Cite

show abstract

“…In the last years, the Smart Transformer (ST) concept has been proposed as central control point in the distribution grid: the ST is a power electronics-based Medium Voltage/Low Voltage (MV/LV) transformer which does not just replace the conventional transformer, but it exploits its dynamic functionalities to offer services to the grid, improving its management [13]- [16]. Among these services, the ST can work similarly to a STATCOM in MV grid, providing voltage support by reactive power injection [17], [18].…”

mentioning

confidence: 99%