Comprehensive Power Losses Model for Electronic Power Transformer

Yue, Quanyou; Li, Canbing; Cao, Yijia; He, Yi; Cai, Bo; Wu, Qiuwei; Zhou, Bin

doi:10.1109/access.2018.2791587

Cited by 24 publications

(11 citation statements)

References 26 publications

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“…Power losses of the four-winding transformer is composed by two parts: core loss and winding loss. Based on the improved Steinmetz equation, the core losses can be calculated as [25],…”

Section: B Power Losses In Four-winding Transformermentioning

confidence: 99%

Capacitor Voltage Ripple Minimization of a Modular Three-Phase AC/DC Power Electronics Transformer With Four-Winding Power Channel

Cheng

et al. 2020

IEEE Access

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Power electronic transformer (PET) with modular cascaded structure has become a flexible interface between AC and DC grids. Nonetheless, the notable 2 nd-order ripple power introduced from the AC source requires considerable energy storage in the module capacitors, which is likely to degrade the overall power density and increase system cost. In this paper, a power channel based four-winding PET (PC-PET) is proposed to address such an issue. Owing to the phase-crossing power channels, the low-frequency ripples can cancel each other through magnetic flux counteracting. To improve the accuracy of power decoupling, the effect compromised by inconsistent windings is considered. Accordingly, a proportional-resonant (PR) control based power decoupling strategy for PC-PET incorporated with power balance is proposed to decouple the three-phase low-frequency ripple powers, and minimize the voltage ripple in module capacitors. Additionally, the improvement of power density is discussed based on analyses on power losses, capacitor volume and transformer volume. Simulation and experimental results verified the validity of proposed control strategies.

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“…Power losses of the four-winding transformer is composed by two parts: core loss and winding loss. Based on the improved Steinmetz equation, the core losses can be calculated as [25],…”

Section: B Power Losses In Four-winding Transformermentioning

confidence: 99%

Capacitor Voltage Ripple Minimization of a Modular Three-Phase AC/DC Power Electronics Transformer With Four-Winding Power Channel

Cheng

et al. 2020

IEEE Access

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“…where P i,ϕ loss.ac and P j loss.dc represent the power loss of the PET AC and DC port, respectively; ϕ = {a, b, c} is the three-phase system; k 0 , k 1 , k 2 are the fitting parameters of the loss, the current of PET AC and DC port are expressed by I i,ϕ ac and I j dc , respectively, and they are defined by (4) and (5), respectively. Actually, the loss model of isolation DC/DC transformer, including the DC/AC converter losses and high frequency transformer losses, also can be written as a function of the phase current magnitude [42], [43]. And the low voltage AC/DC ports of PET are obtained from the low voltage DC bus of DC/DC isolation transformer in general [4], [44], [45].…”

Section: A Vsc Power Injection Modelmentioning

confidence: 99%

“…Step 4: Check the inner loop convergence criterion (43). If satisfied, go to step 5; otherwise, return to step 2.…”

Section: Decentralized Solution Proceduresmentioning

confidence: 99%

A Decentralized Optimal Operation of AC/DC Hybrid Microgrids Equipped With Power Electronic Transformer

Dong

Zhang

et al. 2019

IEEE Access

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In the AC/DC hybrid microgrids equipped with power electronic transformer (PET), different AC grids and DC grids are connected through multiport PET to operate the entire network in a secure and economic manner. This paper proposes a decentralized optimal power flow model, considering the multiport coordinated control strategy of PET, for running autonomous AC/DC hybrid microgrids. To optimize the power flow in the network, the steady state model of PET is established, including voltage source converter power injection model and Kriging model. By introducing a secondary droop control layer can realize the autonomous operation of AC/DC hybrid microgrids and increase the utilization efficiency of distributed generations. Then using the analytical target cascading approach, each AC/DC sub-microgrid is regarded as different autonomous subjects. The distributed PET is as power coupling node and information interaction node to decompose the optimal problem of AC/DC hybrid microgrids equipped with PET which is solved in parallel. The obtained subproblems for these grid levels are solved with a nested solution process. The simulation results verify the correctness and effectiveness of the proposed model in this paper. INDEX TERMS AC/DC hybrid microgrids, power electronic transformer, steady state model, autonomous operation, decentralized optimal power flow.

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“…Hence, the focus is on improving the energy efficiency of electronic gadgets so that the available resources are best utilized. The importance of discussion on the power losses and especially in transformers can be well appreciated by referring to [4,5], as it discusses the power loss in an electronic power transformer as against a conventional power transformer.…”

Section: Problem Statementmentioning

confidence: 99%

A practical technique to measure transformer losses in high frequency SMPS

2019

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All electronic gadgets today employ high frequency Switch Mode Power Supplies. As the number of such gadgets is increasing rapidly, the focus is on improving the efficiency of power conversion and better utilization of energy. It is always a challenge for the practicing power supply engineers to exactly apportion and evaluate the total losses in the power converters. While it is relatively easy to compute and measure the power losses in semiconductor devices, it is practically difficult to measure the power losses in magnetic components. The data sheets provided by the manufacturers, for core loss and thermal resistance, do act as a starting point in the design stage but, always the designers felt the need to know the exact power loss in the ferrite high frequency transformers and their thermal resistance values. The data sheets provide thermal resistance values only for the cores and it is necessary to quantify value for a fully wound transformers. Copper losses in high frequency transformers are very significant and too involved to compute. In this paper, we propose a simple and practical technique, which precisely depicts the actual power loss in a high frequency ferrite core transformer. With this technique various ferrite cores can be characterized for their hysteresis losses at varying flux densities and frequencies. We can also precisely compute the thermal resistance of the Ferrite transformers.

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Comprehensive Power Losses Model for Electronic Power Transformer

Cited by 24 publications

References 26 publications

Capacitor Voltage Ripple Minimization of a Modular Three-Phase AC/DC Power Electronics Transformer With Four-Winding Power Channel

Capacitor Voltage Ripple Minimization of a Modular Three-Phase AC/DC Power Electronics Transformer With Four-Winding Power Channel

A Decentralized Optimal Operation of AC/DC Hybrid Microgrids Equipped With Power Electronic Transformer

A practical technique to measure transformer losses in high frequency SMPS

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