High Frequency Transformer’s Parasitic Capacitance Minimization for Photovoltaic (PV) High-Frequency Link-Based Medium Voltage (MV) Inverter

Himanshu, -; Singh, Harsimran; Kumar, Pandiyan Sathish; Ali, Muhammad Umair; Lee, Ho-Yeong; Khan, Muhammad Adil; Park, Gwan Soo; Kim, Hee-Je

doi:10.3390/electronics7080142

Cited by 13 publications

(3 citation statements)

References 36 publications

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“…Moreover, transformer C has the largest magnetizing inductance and leakage inductance, as shown in Table 3, which caused resonance at a lower frequency compared with transformers A and B. The parasitic capacitance can be minimized using a multi-section winding configuration [40] or separating the primary and secondary windings on opposite sides of the toroidal core [41].…”

Section: Core Loss Evaluationmentioning

confidence: 99%

Performance Comparison of Ferrite and Nanocrystalline Cores for Medium-Frequency Transformer of Dual Active Bridge DC-DC Converter

et al. 2021

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This article reports an investigation into ferrite and nanocrystalline materials for the medium-frequency transformer of a dual active bridge DC-DC converter, which plays a key role in the converter’s efficiency and power density. E65 MnZn ferrite cores and toroidal and cut nanocrystalline cores are selected for the construction of 20-kHz transformers. Transformer performance is evaluated with a 1.1-kW (42–54 V)/400 V dual active bridge DC-DC converter with single-phase shift and extended phase shift modulations. The experimental results indicate that the toroidal nanocrystalline transformer had the best performance with an efficiency range of 98.5–99.2% and power density of 12 W/cm3, whereas the cut-core nanocrystalline transformer had an efficiency range of 98.4–99.1% with a power density of 9 W/cm3, and the ferrite transformer had an efficiency range of 97.6–98.8% with a power density of 6 W/cm3. A small mismatch in the circuit parameters is found to cause saturation in the nanocrystalline toroidal core, due to its high permeability. The analytical and experimental results suggest that cut nanocrystalline cores are suitable for the dual active bridge DC-DC converter transformers with switching frequencies up to 100 kHz.

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Section: Core Loss Evaluationmentioning

confidence: 99%

Performance Comparison of Ferrite and Nanocrystalline Cores for Medium-Frequency Transformer of Dual Active Bridge DC-DC Converter

et al. 2021

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“…The 50/60Hz transformer modeling has been extensively studied for the electromagnetic transient simulations [16]- [19]. On the other hand, MFT modeling has to take into account the high frequency effects on the winding resistance [20], [21], parasitic capacitances [22], [23], and core loss [24], [25]. A nonlinear model of a 3-phase MFT was proposed in [26].…”

Section: Introductionmentioning

confidence: 99%

Modified Preisach Model of Hysteresis in Multi Air Gap Ferrite Core Medium Frequency Transformer

Michna

Dworakowski²,

Wilk

et al. 2022

IEEE Trans. Power Delivery

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This article presents the modified Preisach model of hysteresis for a 3-phase medium frequency transformer in a 100 kW dual active bridge converter. The transformer magnetic core is assembled out of ferrite I-cores, which results in multiple parasitic air gaps. For this transformer, the hysteresis loops were measured and the parameters of the Preisach model were determined. The Preisach distribution function is approximated with a two-dimensional Gauss function series and the feedback function is a 3rd-degree polynomial. The optimized identification of Preisach distribution function parameters was prepared. Two sets of parameters were determined based on the analysis of major and minor hysteresis loop. The developed model is used to analyze the transformer core power loss. A new set of Steinmetz equation parameters for the multi air gap ferrite core MFT is proposed.

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“…However, the power quality is compromised as a result of the increase in common mode noise currents by the high inter-winding parasitic capacitance in high-frequency link transformers. To solve this problem, the modified design of a toroid ferrite core transformer offers more resistance to temperature increases without the use of any cooling agent or external circuitry power sources for power transmission [7].…”

Section: Introductionmentioning

confidence: 99%

Control Strategies of Mitigating Dead-time Effect on Power Converters: An Overview

Yang

Zhou

et al. 2019

Electronics

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To prevent short-circuits between the upper and lower switches of power converters from over-current protection, the dead time is mandatory in the switching gating signal for voltage source converters. However, this results in many negative effects on system operations, such as output voltage and current distortions (e.g., increased level of fifth and seventh harmonics), zero-current-clamping phenomenon, and output fundamental-frequency voltage reduction. Many solutions have been presented to cope with this problem. First, the dead-time effect is analyzed by taking into account factors such as the zero-clamping phenomenon, voltage drops on diodes and transistors, and the parameters of inverter loads, as well as the parasitic nature of semiconductor switches. Second, the state-of-the-art dead-time compensation algorithms are presented in this paper. Third, the advantages and disadvantages of existing algorithms are discussed, together with the future trends of dead-time compensation algorithms. This article provides a complete scenario of dead-time compensation with control strategies for voltage source converters for researchers to identify suitable solutions based on demand and application.

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High Frequency Transformer’s Parasitic Capacitance Minimization for Photovoltaic (PV) High-Frequency Link-Based Medium Voltage (MV) Inverter

Cited by 13 publications

References 36 publications

Performance Comparison of Ferrite and Nanocrystalline Cores for Medium-Frequency Transformer of Dual Active Bridge DC-DC Converter

Performance Comparison of Ferrite and Nanocrystalline Cores for Medium-Frequency Transformer of Dual Active Bridge DC-DC Converter

Modified Preisach Model of Hysteresis in Multi Air Gap Ferrite Core Medium Frequency Transformer

Control Strategies of Mitigating Dead-time Effect on Power Converters: An Overview

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