Optimal Design of High-Frequency Magnetic Links for Power Converters Used in Grid-Connected Renewable Energy Systems

Islam, Md. Rabiul; Lei, Gang; Guo, Youguang; Zhu, Jun

doi:10.1109/tmag.2014.2329939

Cited by 48 publications

(15 citation statements)

References 14 publications

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“…The magnetic links facilitate galvanic isolation, voltage balancing, magnetic integration of multiple power sources, and isolation among multiple output ports, which in turn allow for the design of power converters for line frequency transformer-less gridconnected systems [14,22,25,26]. On the other hand, the magnetic link is one of the lossy, heavy, and bulky components in a high-frequency and very-high-frequency power supplies or converters.…”

Section: Grid Integration Of Direct Drive Wave Energy Generators (Ddwmentioning

confidence: 99%

Design and characterisation of advanced magnetic material‐based core for isolated power converters used in wave energy generation systems

Islam

Farrok²,

Rahman

et al. 2020

IET Electric Power Applications

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The oceanic wave energy generation has been drawn significant attention in the field of power engineering recently. These generation systems are basically direct drive electrical power generators connected to the wave energy devices with the variable frequency drives (VFDs). This study proposes an application of high-frequency transformers at the output stages of VFDs for the galvanic isolation purpose among multiple output ports of VFDs in a wave farm. The design process of a highfrequency magnetic link involves multiphysics problems that entail complex tradeoffs between electrical and magnetic properties including efficiency. Moreover, the performance of the magnetic link depends on the switching characteristics of the power switching devices and various excitation signals. Therefore, extensive multiphysics research in the field of design and optimisation of magnetic links is needed to develop next-generation technologies. In this study, a finite-element method-based systematic process is presented for the design of amorphous alloy-based core of the high-frequency magnetic link. Two cores are developed and characterised in the laboratory. The characterised data obtained from the experiment can be used in the future design optimisation of other high-frequency magnetic links.

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Section: Grid Integration Of Direct Drive Wave Energy Generators (Ddwmentioning

confidence: 99%

Design and characterisation of advanced magnetic material‐based core for isolated power converters used in wave energy generation systems

Islam

Farrok²,

Rahman

et al. 2020

IET Electric Power Applications

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“…The error between measured and calculated values for higher frequency harmonics is slightly increased due to the small amplitude of the harmonics and limited accuracy of the measurement system (spectrum analyser) which is not important due to negligible impact of those harmonics on the copper loss. The measured values of ac resistance and harmonic amplitude of each harmonic term are used to calculate the copper loss attributed to that harmonic and the total copper loss of that winding by using (1) and (2). In the DAB operation mode, the effect of variation in zero voltage angle from 0 to π/2 was experimentally measured for two cases of phase shift angles, such as φ31= π/8 and φ31=π/2.…”

Section: A Measurement Of Copper Loss For Dab and Tab Operation Modesmentioning

confidence: 99%

Copper Loss Analysis of a Multiwinding High-Frequency Transformer for a Magnetically-Coupled Residential Microgrid

Jafari

Malekjamshidi

Zhu

2019

IEEE Trans. on Ind. Applicat.

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Improvements in characteristics of magnetic materials and switching devices have provided the feasibility of replacing the electrical buses with high-frequency magnetic links in small-scale micro-grids. This can effectively reduce the number of voltage conversion stages, size and cost of the microgrid, and isolate the sources and loads. To optimally design the magnetic link, an accurate evaluation of copper loss of the windings considering both the current waveforms and parasitic effects are required. This paper studies the copper loss analysis of a three-winding high-frequency magnetic link for residential micro-grid applications. Due to the non-sinusoidal nature of the voltages and currents, the loss analysis is carried out on a harmonic basis taking into account the variations of phase shift, duty ratio and amplitude of the waveforms. The high-frequency parasitic phenomena including the skin and proximity effects are taken into account. The maximum and minimum copper loss operating conditions of the magnetic link and their dependency on the phase shift angle and the duty ratio of the connected waveforms are studied. A prototype of the micro-grid including the magnetic link is developed to validate the theoretical analysis, evaluate the micro-grid efficiency and perform the loss breakdown.

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“…The high efficiency/temperature operation reduces the system weight predominately by reducing the cooling system requirements. 2) Lightweight magnetic components: Multi physics modeling and design optimization of transformers and inductors in reference to geometric optimization, magnetic material properties, medium/high frequency operation and high voltage isolation stress analysis [18]- [24]. 3) Cooling systems: Optimizations that yield cooling systems which feature minimal weight for a required thermal resistance [25]- [27].…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Conceptualization, Design, and Experimental Verification of a Weight-Optimized All-SiC 2 kV/700 V DAB for an Airborne Wind Turbine

Gammeter

Krismer

Kolar

2016

IEEE J. Emerg. Sel. Topics Power Electron.

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This paper details the design, the implementation, and the experimental verification of a minimum weight input series output parallel (ISOP) structured Dual Active Bridge (DAB) converter for an Airborne Wind Turbine (AWT) system. The main power components of the DAB converter, in particular the bridge circuits, the actively cooled high frequency (HF) transformer and inductor, and the cooling system, which largely contribute to the total system weight, are designed and realized based on multi-objective considerations, i.e. with respect to weight and efficiency. Furthermore, the design includes all necessary considerations to realize a fully functional prototype, i.e. it also considers the auxiliary supply, the control for stable operation of the system, which also comprises an input filter, over the specified operating range, and the startup and shut down procedure. These considerations show the complex interactions of the various system parts and reveal that a comprehensive conceptualization is necessary to arrive at a reliable minimum weight design. Experimental results validate the proposed design procedure for a realized lightweight DAB hardware prototype with a rated power of 6.25 kW. The prototype weighs 1.46 kg, i.e. features a power to weight ratio of 4.28 kW/kg (1.94 kW/lb), and achieves a maximum full-load efficiency of 97.5 %.

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Optimal Design of High-Frequency Magnetic Links for Power Converters Used in Grid-Connected Renewable Energy Systems

Cited by 48 publications

References 14 publications

Design and characterisation of advanced magnetic material‐based core for isolated power converters used in wave energy generation systems

Design and characterisation of advanced magnetic material‐based core for isolated power converters used in wave energy generation systems

Copper Loss Analysis of a Multiwinding High-Frequency Transformer for a Magnetically-Coupled Residential Microgrid

Comprehensive Conceptualization, Design, and Experimental Verification of a Weight-Optimized All-SiC 2 kV/700 V DAB for an Airborne Wind Turbine

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