배터리 에너지 저장 시스템에 사용되는 전력 변환 시스템의 디지털 제어 Digital Control of Power Conversion System Used in Battery Energy Storage System-Wan, Kim Department of Marine Electronic, Communication and Computer Engineering, Graduate School, Mokpo National Maritime University

 Digital Control of Power Conversion System Used in Battery Energy Storage System

 BY Wan, Kim 

Department of Marine Electronic, Communication and Computer Engineering, Graduate School, Mokpo National Maritime University (Supervised by Professor : Kwang-Woon, Lee) 

ABSTRACT

To operate the electric power supply system more efficiently and stably, the utilization of battery energy storage system (BESS) is increasing. By using BESS, the residual electrical energy can be stored at low power demand times and the stored electrical energy can be released at high power demand times. Therefore, BESS can counteract the frequency fluctuation of the electric power system due to load variations. In addition, BESS can be utilized to make stable operation of renewable energy sources such as photovoltaic power generation and wind power generation. An electric power conversion system is used in BESS and it consists of bidirectional dc-to-dc converters and dc-to-ac inverters; the role of the bidirectional dc-to-dc converters is to charge and discharge the batteries and the dc-to-ac inverters are employed for grid connected energy conversion. A digital control is generally used to control the electric power conversion system of BESS and typical digital control strategy is based on the small signal model of the electric power conversion system. However, it is known that the small signal model based digital control is vulnerable to the operating point variations because the small signal model is obtained at a specific operating point. The purpose of this paper is to present a stable digital control strategy for the electric power conversion system of BESS, insensitive to operating point variations. This paper presents a design method for the power conversion system of BESS, wherein an average model based control is employed to solve the problem of the conventional small signal model based control. To compare the performance of the proposed control method with the conventional small signal model based controller, the single input and single output (SISO) controller design tool of MATLAB is utilized. For this purpose, the small signal model of the bidirectional dc-to-dc converter is derived and the SISO tool based digital controller is designed to obtain the specific bandwidth and phase margin. The time and frequency domain responses of the proposed average model based controller are obtained using a PSIM software and the obtained results are compared with the responses of the conventional small signal model based controller to show the improved transient control performance of the proposed method. To prove the effectiveness of the proposed method, the proposed control method is implemented using a digital signal processor (DSP).

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A comprehensive design approach for a three-winding planar transformer Shenli Zou1 Chanaka Singhabahu2 Jianfei Chen2 Alireza Khaligh2

A comprehensive design approach for a three-winding planar transformer 

Shenli Zou1 Chanaka Singhabahu2 Jianfei Chen2 Alireza Khaligh2 

1Electric Power Conversion, Rivian Automotive,

Inc, USA

2Maryland Power Electronics Laboratory (MPEL),

Department of Electrical and Computer

Engineering, Institute for Systems Research,

University of Maryland, College Park, Maryland,

USA

 Abstract 

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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https://ietresearch.onlinelibrary.wiley.com/doi/full/10.1049/pel2.12261

Full-SiC Integrated Power Module Based on Planar Packaging Technology for High Efficiency Power Converters in Aircraft Applications O. Raab, M. Guacci, A. Griffo, K. Kriegel, M. Heller, J. Wang, D. Bortis, M. Schulz, J. W. Kolar

 

Proceedings of the 11th International Conference on Integrated Power Electronics Systems (CIPS 2020), Berlin, Germany, March 24-26, 2020 

Full-SiC Integrated Power Module Based on Planar Packaging Technology for High Efficiency Power Converters in Aircraft Applications O. Raab, M. Guacci, A. Griffo, K. Kriegel, M. Heller, J. Wang, D. Bortis, M. Schulz, J. W. Kolar 

Full-SiC Integrated Power Module based on Planar Packaging Technology for High Efficiency Power Converters in Aircraft Applications Oliver Raaba , Mattia Guaccib , Antonio Griffoc , Kai Kriegela , Morris Hellerb , Jiabin Wangc , Dominik Bortisb , Martin Schulza , and Johann W. Kolarb aSiemens AG, Corporate Technology, Munich, Germany bPower Electronic Systems Laboratory, ETH Zurich, Zurich, Switzerland cDepartment of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, UK 

Abstract

 Compact, light-weight, efficient and reliable power converters are fundamental for the future of More Electrical Aircraft (MEA). Core elements supporting the electrification of the aerospace industry are power modules (PMs) employing exclusively SiC MOSFETs. In order to fully exploit the high switching speeds enabled by SiC, and to address the challenges arising from the parallelization of power devices, novel PM concepts must be investigated. In this paper, highly symmetrical layouts, low inductance planar interconnection technologies, and integrated buffer capacitors are explored to realize a high efficiency, fast-switching, and reliable full-SiC PM for MEA applications. A comprehensive assessment of a number of performance metrics against state-of-the-art full-SiC PMs demonstrates the benefits of the proposed design approach and manufacturing technologies. Moreover, by integrating temperature and current sensors, intelligent functions, which are crucial for the safe application of power electronics in MEA, are added to the developed PM. In this context, the use of MOSFETs’ Temperature Sensitive Electrical Parameters for online junction temperature estimation is demonstrated, allowing for non-invasive, i.e. without the need for dedicated sensors, thermal monitoring. Additionally, a highly compact gate driver, reducing the overall system volume and complexity, is designed and integrated in the housing of the PM. Finally, switching waveforms are measured during operation of the PM at 500V and 200A, proving the performance improvement enabled by the low inductance layout, the integrated snubber, and the gate driver.

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The MEGACube 166kW/20kHz Medium-Frequency Transformer

 

The MEGACube 166kW/20kHz Medium-Frequency Transformer 

ABSTRACT 

High power DC-DC conversion constitutes the key enabling technology for the implementation of solid-statetransformers. Within these high-power DC-DC converters, the Medium Frequency (MF) transformer is one of the main components, as its task is to provide the primary to secondary isolation and the step-up ratio between the different voltage levels. Several options for the construction of this MF transformer have been reported with different considered core materials, winding arrangements, isolation concepts and thermal management, whereby the main realizations will be revised in this paper. Thereafter, the details of a 166kW/20kHz MF transformer will be presented together with the designed test-bench utilized for the continuous testing of the transformer.

ORIGINAL LINK IN WEB:https://www.pes-publications.ee.ethz.ch/uploads/tx_ethpublications/01_MegaCube_Trafo_Digest_APEC2013.pdf

Design and Experimental Analysis of a Medium-Frequency Transformer for Solid-State Transformer Applications M. Leibl, G. Ortiz, J. W. Kolar

IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS, VOL. 5, NO. 1, MARCH 2017 

Design and Experimental Analysis of a Medium-Frequency Transformer for Solid-State Transformer Applications Michael Leibl, Member, IEEE, Gabriel Ortiz, Member, IEEE, and Johann W. Kolar, Fellow, IEEE 

 Abstract— Within a solid-state transformer, the isolated dc–dc converter and in particular its medium-frequency transformer are one of the critical components, as it provides the required isolation between primary and secondary sides and the voltage conversion typically necessary for the operation of the system. A comprehensive optimization procedure is required to find a transformer design that maximizes power density and efficiency within the available degrees of freedom while complying with material limits, such as temperature, flux density, and dielectric strength as well as outer dimension limits. This paper presents an optimization routine and its underlying loss and thermal models, which are used to design a 166 kW/20 kHz transformer prototype achieving 99.4% efficiency at a power density of 44 kW/dm3. Extensive measurements are performed on the constructed prototype in order to measure core and winding losses and to investigate the current distribution within the litz wire and the flux sharing between the cores.

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