A simplified approach to input voltage balancing for series connected isolated DC-DC converters

Kroics, Kaspars; Zaķis, Jānis; Suzdalenko, Alexander; Gaigals, Gatis

doi:10.1109/epe.2016.7695415

Cited by 15 publications

(5 citation statements)

References 21 publications

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“…Step 3: Start the control for the boost stages to regulate U bk , k = 1,…, N and the DAB stages to control the low voltage side voltage U out with the reference defined in (15), in proportional to the boost output voltages. The reference voltage in (15) ensures the DAB stages working under the rated voltage turn ratios. Turn on the balancing control to mitigate discrepancies between submodules.…”

Section: Soft Startupmentioning

confidence: 99%

“…voltage balance issues among floating capacitors. DC ISOP PETs with submodules using different kinds of isolated DC/DC converters were studied, [13][14][15] among which dual active bridges (DABs) are a mature option with the benefits of wide soft switching range, ease of control, etc. 16 A lot of existing studies are focused on control and modulation schemes for the DAB-based ISOP PET, 13,17,18 whereas the comprehensive control structure and design in terms of practical applications are rarely seen.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive control strategy and robust operation for input series output parallel power electronics transformers in MVDC grids

Cheng¹,

Wang

et al. 2020

Int Trans Electr Energ Syst

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In medium-voltage dc grids, power electronics transformers (PETs) play an important role in interconnecting grids with different voltage levels and directing power flow between grids. This paper presents a comprehensive control strategy for input series output parallel PETs, including control design for submodules consisting of boost and dual active bridge, balancing control between submodules, soft startup and operations after submodule faults. Through the control strategy, the PET is capable of regulating either the voltage or the power on the low voltage side, and it can operate safely and robustly during large transients in startup and submodule failures. The proposed control strategy is validated using PLECS simulation and verified experimentally with a scaled-down laboratory prototype.

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Section: Soft Startupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comprehensive control strategy and robust operation for input series output parallel power electronics transformers in MVDC grids

Cheng¹,

Wang

et al. 2020

Int Trans Electr Energ Syst

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show abstract

“…Comparison of PLL is done in [20][21][22] and as most promising the Second-Order Generalized Integrator (SOGI) PLL and Park PLL are carried out. As in this case the converter is designed for single phase application, the Park PLL is more difficult to implement, therefore, hybrid SOGI and Park based PLL are used.…”

Section: Phase Locked Loopmentioning

confidence: 99%

Analysis of advanced inverter topology for renewable energy generation and energy storage integration into AC grid

Kroics¹,

Zemite²,

Gaigals³

2017

Engineering for Rural Development

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Abstract. In renewable energy generation systems energy storage is needed not only to supply power when there is no generation. but also for short term smoothening of the electricity supply. The Quasi-Z-source Inverter (qZSI) allows to integrate energy storage in addition to the other energy sources mainly for output power smoothening. In the paper analysis of the scientific papers is given about this kind of converters and also theoretical and simulation based analysis of basic relations, control principles and scientific analysis that reveals limitations and passive component selection. Also the design of the proportional-resonant controller will be analyzed and discussed in more detail.

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“…There are a few suggestions to support efficiency improvement of the forward converter at the universal mains wide range. However, most previous approaches only realize interleaving by mechanically combining several forward converters, connecting two forward converters' primary sides in series to reduce the voltage stress [3,5,13] or in parallel to reduce current stress [8,14]. The main limitations of these solutions are the wide dynamic range over the universal mains and the need for two transformers and two secondary side components.…”

Section: Introductionmentioning

confidence: 99%

Dual Voltage Forward Topology for High Efficiency at Universal Mains

Ezra

Werner²,

2022

Electronics

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This paper introduces a forward converter aimed at the universal mains voltages, i.e., 220–230 Vac and 115 Vac, named the ‘dual voltage forward converter’. The suggested converter has a narrow dynamic range at the universal mains voltages, which results in lower stress on devices, optimal duty cycles, and better overall efficiency. The topology comprises two primary power loops reconfigurable by additional two-state switches and a passive diode, which allows the converter to run in parallel or in series modes and increase the performance over the full universal mains range of 90–265 Vac. The utilization of the devices is better, as they experience lower voltage and current stress by supporting two optimized working points. A converter operating at 100 kHz with an output power of 75 W and output voltage of 12 Vdc was designed and tested. The results were compared with a conventional forward converter with the identical specification. The results at the low mains were similar between the converters; however, at the high mains, the efficiency improvement was between 5% and 23%.

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A simplified approach to input voltage balancing for series connected isolated DC-DC converters

Cited by 15 publications

References 21 publications

Comprehensive control strategy and robust operation for input series output parallel power electronics transformers in MVDC grids

Comprehensive control strategy and robust operation for input series output parallel power electronics transformers in MVDC grids

Analysis of advanced inverter topology for renewable energy generation and energy storage integration into AC grid

Dual Voltage Forward Topology for High Efficiency at Universal Mains

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