Multi-cell DC-DC converter based solid-state transformer (SST) design featuring medium-voltage grid-tie application

Alam, Kazi Saiful; Tria, Lew Andrew R.; Xiao, Dan; Rahman, M.F.

doi:10.1109/icems.2017.8056068

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…Model discretisation, feedback correction and rolling optimisation are essential requirements for the MPC strategy. By discretising (13) and (14) within one switching cycle, we have…”

Section: Mpc Strategy With the Operation Of The Forward Power Flowmentioning

confidence: 99%

“…Thus, it contributes to the diversification of DCT topology. In MVDC and low-voltage dc (LVDC) micro-grid, multiple dual active bridge (DAB) converters with input-series output-parallel (ISOP) connection [11][12][13][14], modular multilevel high-frequency link dc-dc converter [15,16] and neutral point clamped-DAB [17,18] are some familiar configuration schemes of the DCT. Besides, the ISOP DAB-DCT has been obtained much attention and extensive application over these years due to high modularity and scalability.…”

Section: Introductionmentioning

confidence: 99%

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Model predictive control of input‐series output‐parallel dual active bridge converters based DC transformer

Zhang

et al. 2020

IET Power Electronics

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DC transformer (DCT) which is composed of dual active bridge (DAB) converters, is capable of fulfiling high-ratio voltage conversion between the medium-voltage dc distribution and low-voltage dc distribution. A model predictive control (MPC) strategy was proposed for the DAB-DCT to improve dynamic performance and achieve a proper power distribution, considering the bidirectional power of DCT. The traditional voltage closed-loop control scheme with the single-phase shift (SPS) and the MPC scheme with SPS are compared on a downscale DAB-DCT laboratory prototype, using PowerPC P2020 + FPGA_6SL X45 as the core controller. The excellent dynamic characteristics of DCT with proposed MPC strategy is verified by extensive experimental results.

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“…Model discretisation, feedback correction and rolling optimisation are essential requirements for the MPC strategy. By discretising (13) and (14) within one switching cycle, we have…”

Section: Mpc Strategy With the Operation Of The Forward Power Flowmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Model predictive control of input‐series output‐parallel dual active bridge converters based DC transformer

Zhang

et al. 2020

IET Power Electronics

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“…A three-stage modular multilevel converter-based ST is presented [1][2][3][4][5][6][7]. This converter provides bidirectional power flow due to its dual active structure.…”

Section: Introductionmentioning

confidence: 99%

“…An updated PR controller is incorporated into the design to address this issue. The developed controller is stable and functions well thanks to the low steady-state error and reliable output [5]. The Quasi-2-Level (Q2L) modulation strategy is proposed for the control of the system due to its effectiveness and superior current transfer capacity.…”

Section: Introductionmentioning

confidence: 99%

Soft-Switching Smart Transformer Design and Application for Photovoltaic Integrated Smart City Power Distribution

Esenboga¹,

Demirdelen²

2022

Sustainability

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Smart city power distributions have become promising technologies to meet the demand for energy in developed countries. However, increase in smart grids causes several power quality problems on the smart grid, in particular, current and voltage harmonic distortions, sudden voltage sag and swells, fault current, and isolation deterioration. Smart transformers are potential solutions to improve the power quality on the electric grid. They present energy efficiency, ensure grid reliability and power flow control, voltage regulation, bidirectional power flow, fault current limiting, harmonic blocking, and galvanic isolation. Therefore, this paper offers an optimal selection of a three-stage (AC-DC-DC-AC) smart transformer model and power control strategy for solar PV power plant integrated smart grids. The topology of the rectifier, isolated bidirectional converter, and inverter has soft-switching features. This enables low conduction loss, low electromagnetic interference (EMI), high efficiency, achievable zero-voltage switching for converters, and zero-current switching for electrical auxiliary systems. Operation strategies of the proposed ST, PWM control, voltage, and current control between converters, including a medium-voltage (MV) high-frequency transformer to realize a 10 kVA, 450 Vdc to 220 Vdc, or 220 Vac ST, are presented. Significantly, the ST prototype achieves 96.7% conversion efficiency thanks to its control strategy, even under unstable power generation conditions from the solar PV plant. Experimental results obtained on the 344 Vac 10.4 A load current validates the dv/dt rate 6.8 kV/us. The dynamic and experimental results of the proposed bidirectional smart transformer demonstrate the success in preventing power quality problems for photovoltaic integrated smart city power distribution.

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Dual Active Bridge - Magnetic Component Configurations for High Boost Application

Dash¹,

2018

2018 2nd International Conference on Power, Energy and Environment: Towards Smart Technology (ICEPE)

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Multi-cell DC-DC converter based solid-state transformer (SST) design featuring medium-voltage grid-tie application

Cited by 5 publications

References 11 publications

Model predictive control of input‐series output‐parallel dual active bridge converters based DC transformer

Model predictive control of input‐series output‐parallel dual active bridge converters based DC transformer

Soft-Switching Smart Transformer Design and Application for Photovoltaic Integrated Smart City Power Distribution

Dual Active Bridge - Magnetic Component Configurations for High Boost Application

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