Variable DC-Link Control Loop Design for an Integrated Two-Stage AC/DC Converter

Lu, Jiangheng; Mallik, Ayan; Zou, Shenli; Khaligh, Alireza

doi:10.1109/tte.2017.2755772

Cited by 33 publications

(5 citation statements)

References 21 publications

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“…As can be seen from Equations (10) and (11), the proposed core loss model is suitable for any switching frequency application. It is expected that at higher switching frequency that is, 1 MHz, the core loss will increase using the same volume and magnetic materials.…”

Section: The Core Loss Modelmentioning

confidence: 99%

“…Research has been conducted in multi-winding transformers in the literature [7][8][9][10]. A split-winding transformer structure is proposed in [7] to realize the multi-port integration.…”

Section: Introductionmentioning

confidence: 99%

“…However, this proposed winding layer configuration is not applicable to a three-winding structure due to the unbalanced flux. In [10], a hand-wound three-winding transformer is proposed; however, the power rating and the performance is limited by the implementation of the Litz wires.…”

Section: Introductionmentioning

confidence: 99%

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A comprehensive design approach for a three‐winding planar transformer

Zou¹,

Singhabahu

Chen

et al. 2022

IET Power Electronics

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In this paper, a new three-winding planar transformer design with the integrated leakage inductor is proposed for a triple-active-bridge converter. It enables two output voltage levels: a high voltage (HV) output port and a low voltage (LV) output port. The primary and secondary windings are split unevenly in both side legs while the tertiary winding is connected in parallel. The unique winding configuration enables: (i) enhanced efficiency with low volume; and (ii) suppressed parasitic capacitances. Detailed transformer reluctance and loss models are developed in the design process. The core geometry is optimized using a reluctance-model-based mathematical computation. Moreover, comprehensive high-fidelity simulations are conducted to analyse the trade-offs among parasitic capacitances, losses, and inductances. The customized core and the non-overlapping winding boards are assembled, characterized, and tested under various power flow conditions.

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Section: The Core Loss Modelmentioning

confidence: 99%

“…Research has been conducted in multi-winding transformers in the literature [7][8][9][10]. A split-winding transformer structure is proposed in [7] to realize the multi-port integration.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A comprehensive design approach for a three‐winding planar transformer

Zou¹,

Singhabahu

Chen

et al. 2022

IET Power Electronics

Self Cite

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“…Additionally, an adaptive dc-link voltage control scheme is studied from the perspective of the dynamic dc-link active power decoupling and thus maximizing the utilization of the passive components (effectively designed for the worst case operating condition) over the entire operating range to improve on the overall converter efficiency performance, which was not previously considered in [19]. This adaptive dc-link scheme has similar concept to [20], [21], however, as they are implemented in ac-dc application these consider only the variation in active power. The range of different operating conditions include the variation in the input voltage, variation in output power, and 0.7 leading pf to 0.7 lagging pf for the output power accounting for reactive power support.…”

Section: Introductionmentioning

confidence: 99%

“…The range of different operating conditions include the variation in the input voltage, variation in output power, and 0.7 leading pf to 0.7 lagging pf for the output power accounting for reactive power support. Further, [20], [21] consider a two-stage topology (an ac-dc stage followed by dc-dc stage) to implement the variable dclink and thus is straightforward to design the controller. Our proposed converter is a single stage (a boost stage and a HB inverter stage parallelly processing power for both the power decoupling and dc-ac conversion) and thus the implementation of the adaptive dc-link controller is more complicated.…”

Section: Introductionmentioning

confidence: 99%

A Single Stage Common Ground Three-Level PV Inverter With Integrated Power Decoupling

Xia

Roy

2020

IEEE Open J. Power Electron.

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In this paper, a T-type common ground transformerless single phase inverter with dynamic swing of the dc-link voltage is presented for photovoltaic (PV) application. The topology is a combination of a bi-directional, partial-powerprocessing boost stage and an asymmetric half-bridge inverter stage along with a T-branch. It takes advantage of the three-level switching states with reduced voltage stress on the main switches to achieve lower switching loss and almost one-half the inductor current ripple w.r.t. two level implementation. The double line frequency power decoupling is addressed by a dynamic dclink approach, which allows a large swing of the dc-link to reduce the decoupling capacitor requirement, enabling an allfilm capacitor implementation. This topology also significantly reduces the high-frequency capacitive coupled ground current by directly connecting the PV negative terminal to the grid neutral. Moreover, an adaptive dc-link voltage control scheme that optimally changes the average value of the dc-link voltage as the operating conditions (load and power factor) vary, has been proposed and thoroughly investigated from the perspective of better utilization of passive components and further reduction of switching losses. A SiC MOSFETs-based 1 kVA laboratory prototype has been built to validate the converter's operation at 200 V dc nominal input and 120 V/60 Hz ac nominal output with a wide range of power factor and load operations. Extensive experimental results validate the superior performance of the topology with the adaptive dc-link voltage control implementation showing a peak efficiency of 98.22% and a CEC efficiency of 98.03% at 50 kHz switching frequency.

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