@inproceedings{dutta_roy_bhattacharya_2014, title={A mode switching, multiterminal converter topology with integrated fluctuating renewable energy source without energy storage}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84900400574&partnerID=MN8TOARS}, DOI={10.1109/apec.2014.6803342}, abstractNote={An important functionality of the Solid State Transformer (SST) is the integration of renewable energy sources within the topology itself, acting as a renewable energy hub. Due to the fluctuating nature of the renewable energy source, such integration becomes a challenge and energy storage becomes a requirement. In this paper a topology variant of single phase SST with multi limb magnetic core is proposed which directly integrates the renewable energy source in the high frequency magnetic stage and uses the grid as the energy buffer eliminating the requirement of energy storage.}, booktitle={Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC}, author={Dutta, S. and Roy, S. and Bhattacharya, Subhashish}, year={2014}, pages={419–426} }
 @inproceedings{dutta_roy_bhattacharya_2013, title={A multi-terminal DC to DC converter topology with power accumulation from renewable energy sources with unregulated DC voltages}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84879384693&partnerID=MN8TOARS}, DOI={10.1109/apec.2013.6520440}, abstractNote={The following paper details out a converter topology which can act as an accumulator of power from different renewable energy sources (RES). Due to the intermittent nature of power availability from RES the DC buses are assumed unregulated. The proposed topology decouples individual voltage sources and reduces unwanted circulation of reactive power between the busses due to mismatch in voltage levels, and at the same time accumulates the power and produces a regulated DC output. The magnetic design of the transformer core has been shown and the topology has been verified with hardware experimental results.}, booktitle={Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC}, author={Dutta, S. and Roy, S. and Bhattacharya, Subhashish}, year={2013}, pages={1124–1130} }
 @inproceedings{dutta_bhattacharya_2013, title={Predictive current mode control of single phase dual active bridge DC to DC converter}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84891133680&partnerID=MN8TOARS}, DOI={10.1109/ecce.2013.6647451}, abstractNote={In this digest a review of various current control strategies in a bidirectional isolated DC to DC converter is shown. Average current control, peak current control and predictive current control is proposed for the single phase topology. A comparison between the controllers is shown with simulation results and experimental verification.}, booktitle={2013 IEEE Energy Conversion Congress and Exposition, ECCE 2013}, author={Dutta, S. and Bhattacharya, Subhashish}, year={2013}, pages={5526–5533} }
 @inproceedings{dutta_roy_bhattacharya_2013, title={integration of multi-terminal dc to dc hub architecture with solid state transformer for renewable energy integration}, booktitle={2013 ieee energy conversion congress and exposition (ecce)}, author={Dutta, S. and Roy, S. and Bhattacharya, S.}, year={2013}, pages={4793–4800} }
 @inproceedings{dutta_bhattacharya_chandorkar_2012, title={A novel predictive phase shift controller for bidirectional isolated dc to dc converter for high power applications}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84870872317&partnerID=MN8TOARS}, DOI={10.1109/ecce.2012.6342791}, abstractNote={In this paper a novel predictive algorithm has been proposed for bi-directional dc-dc converters with high frequency transformer isolation. The converter is a dual active bridge converter. The proposed algorithm is a faster alternative to the classical PI based phase shift controller. This mode of control can remove dc bias in the isolation transformer within several switching cycles hence preventing transformer saturation. Aspects of the proposed algorithm have been implemented on a hardware test bed and verified.}, booktitle={2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012}, author={Dutta, S. and Bhattacharya, Subhashish and Chandorkar, M.}, year={2012}, pages={418–423} }
 @inproceedings{parks_dutta_ramachandram_hatua_bhattacharya_2012, title={Black start control of a solid state transformer for emergency power restoration}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84870862926&partnerID=MN8TOARS}, DOI={10.1109/ecce.2012.6342824}, abstractNote={This paper demonstrates the black start capabilities of a single phase 20kVA solid state transformer (SST), specifically for microgrid power restoration during islanding. SST's have many benefits including better management of renewable energy resources and more intelligent control than the classical transformer which acts only as a passive device. An additional benefit of the SST that is demonstrated in this paper is the ability to use these renewable energy resources directly connected to the SST to restore microgrid load power during an islanding event. During the black start procedure the SST can switch the control operation of its three cascaded power converter stages, AC/DC rectifier, Dual Active Bridge, and DC/AC inverter, in order to restore the microgrid load. The benefits of using the SST for black start restoration are also discussed and compared with other traditional methods.}, booktitle={2012 IEEE Energy Conversion Congress and Exposition, ECCE 2012}, author={Parks, N. and Dutta, S. and Ramachandram, V. and Hatua, K. and Bhattacharya, Subhashish}, year={2012}, pages={188–195} }
 @inproceedings{dutta_parkhideh_bhattacharya_moghaddam_gould_2012, title={Development of a predictive observer thermal model for power semiconductor devices for overload monitoring in high power high frequency converters}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-84860126119&partnerID=MN8TOARS}, DOI={10.1109/apec.2012.6166144}, abstractNote={In this paper a predictive observer model for power semiconductor devices is developed and integrated in the digital controller. The Model is simulated in Mat lab Simulink and tested with a power converter in hardware for the accuracy of modeling.}, booktitle={Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC}, author={Dutta, S. and Parkhideh, B. and Bhattacharya, Subhashish and Moghaddam, G.K. and Gould, R.}, year={2012}, pages={2305–2310} }
 @inproceedings{dutta_moghaddam_bhattacharya_gould_2012, title={Novel power electronics overload and temperature rise and time interval prediction based on dynamic thermal modeling}, DOI={10.1115/imece2011-64048}, abstractNote={In this digest an overload predicting algorithm is proposed based on the converter operating point and the thermal model of a 6.5 KV Silicon IGBT module. This algorithm can predict both the overload and the time interval for overload and hence can be used for thermal cycle performance evaluation for converters.}, booktitle={Proceedings of the ASME International Mechanical Engineering Congress and Exposition, 2011, vol 11}, author={Dutta, S. and Moghaddam, G. K. and Bhattacharya, S. and Gould, R.}, year={2012}, pages={809–813} }
 @inproceedings{wang_baek_elliott_kadavelugu_wang_she_dutta_liu_zhao_yao_et al._2011, title={Design and hardware implementation of Gen-1 silicon based solid state transformer}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-79955785263&partnerID=MN8TOARS}, DOI={10.1109/apec.2011.5744766}, abstractNote={This paper presents the design and hardware implementation and testing of 20kVA Gen-1 silicon based solid state transformer (SST), the high input voltage and high voltage isolation requirement are two major concerns for the SST design. So a 6.5kV 25A dual IGBT module has been customized packaged specially for this high voltage low current application, and an optically coupled high voltage sensor and IGBT gate driver has been designed in order to fulfill the high voltage isolation requirement. This paper also discusses the auxiliary power supply structure and thermal management for the SST power stage.}, booktitle={Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC}, author={Wang, G. and Baek, S. and Elliott, J. and Kadavelugu, A. and Wang, F. and She, X. and Dutta, S. and Liu, Y. and Zhao, T. and Yao, W. and et al.}, year={2011}, pages={1344–1349} }
 @inproceedings{kadavelugu_baek_dutta_bhattacharya_das_agarwal_scofield_2011, title={High-frequency design considerations of dual active bridge 1200 V SiC MOSFET DC-DC converter}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-79955786991&partnerID=MN8TOARS}, DOI={10.1109/apec.2011.5744614}, abstractNote={Silicon carbide (SiC) is more favorable than Silicon (Si) to build high voltage devices due its wider band-gap and higher critical field strength. Especially, the SiC MOSFETs are finding their niche in 1 kV range, which is currently dominated by Si IGBTs. This paper aims at demonstrating high power and high frequency operation of the SiC MOSFETs, as a means to evaluate the feasibility of using SiC MOSFETs for high power density applications. The sample devices chosen for this study are 1200 V, 20 A, SiC MOSFETs co-packed with 10 A JBS diodes — manufactured by the CREE Inc. A dual active bridge (DAB) converter has been built to validate the suitability of SiC devices for high power density converters. The design details of the DAB hardware, and the high frequency transformer used for interfacing both the bridges are given. Experimental results on the DAB at 100 kHz switching frequency are presented. Finally, the device switching waveforms up to 1 MHz are given.}, booktitle={Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC}, author={Kadavelugu, A. and Baek, S. and Dutta, S. and Bhattacharya, Subhashish and Das, M. and Agarwal, A. and Scofield, J.}, year={2011}, pages={314–320} }
 @inproceedings{hatua_dutta_tripathi_baek_karimi_bhattacharya_2011, title={Transformer less intelligent power substation design with 15kV SiC IGBT for grid interconnection}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-81855226026&partnerID=MN8TOARS}, DOI={10.1109/ecce.2011.6064346}, abstractNote={Basic power topology for a Solid State Transformer (SST) with new 15kV SiC IGBT devices is discussed. It is difficult to build high efficient, light weight, magnetically isolated solid state transformer for high voltage (13.8 kV) grid connectivity with existing Si 6.5kV rated IGBTs and diodes. Existing state of the art high voltage (6.5kV), high speed power devices (IGBT) cause considerable amount of loss (switching and conduction loss). With the advent of SiC devices these limitations are largely mitigated and this provides the motivation for new power topologies. The targeted efficiency of the proposed SST is 98%.Simulation results for a 1 MVA proposed SST topology is presented.}, booktitle={IEEE Energy Conversion Congress and Exposition: Energy Conversion Innovation for a Clean Energy Future, ECCE 2011, Proceedings}, author={Hatua, K. and Dutta, S. and Tripathi, A. and Baek, S. and Karimi, G. and Bhattacharya, Subhashish}, year={2011}, pages={4225–4232} }
 @article{bhattacharya_zhao_wang_dutta_baek_du_parkhideh_zhou_huang_2010, title={Design and Development of Generation-I Silicon based Solid State Transformer}, ISSN={["1048-2334"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-77952195486&partnerID=MN8TOARS}, DOI={10.1109/apec.2010.5433455}, abstractNote={The Solid State Transformer (SST) is one of the key elements proposed in the National Science Foundation (NSF) Generation-III Engineering Research Center (ERC) “Future Renewable Electric Energy Delivery and Management” (FREEDM) Systems Center. The SST is used to enable active management of distributed renewable energy resources, energy storage devices and loads. In this paper, the Generation-I SST single-phase 20kVA, based on 6.5kV Si-IGBT is proposed for interface with 12kV distribution system voltage. The SST system design parameters, overall system efficiency, high frequency transformer design, dual active bridge converter, auxiliary power supply and gate drives are investigated. Design considerations and experimental results of the prototype SST are reported.}, journal={2010 TWENTY-FIFTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC)}, author={Bhattacharya, Subhashish and Zhao, Tiefu and Wang, Gangyao and Dutta, Sumit and Baek, Seunghun and Du, Yu and Parkhideh, Babak and Zhou, Xiaohu and Huang, Alex Q.}, year={2010}, pages={1666–1673} }
 @article{zhao_wang_zeng_dutta_bhattacharya_huang_2010, title={Voltage and Power Balance Control for a Cascaded Multilevel Solid State Transformer}, ISSN={["1048-2334"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-77952178838&partnerID=MN8TOARS}, DOI={10.1109/apec.2010.5433584}, abstractNote={In this paper, a 20kVA Solid State Transformer (SST) based on 6.5kV IGBT is proposed for interface with 7.2kV distribution system voltage. The proposed SST consists of a cascaded multilevel AC/DC rectifier stage, a Dual Active Bridge (DAB) converter stage with high frequency transformers and a DC/AC inverter stage. Based on the single phase d-q vector control, a novel control strategy is proposed to balance the rectifier capacitor voltages and the real power through the DAB parallel modules. Furthermore, the power constraints of the voltage balance control are analyzed. The SST switching model simulation demonstrates the effectiveness of the proposed voltage and power balance controller. A 3kW SST scale-down prototype is implemented. The experiment results verify the single phase d-q vector controller for the SST cascaded multilevel rectifier.}, journal={2010 TWENTY-FIFTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC)}, author={Zhao, Tiefu and Wang, Gangyao and Zeng, Jie and Dutta, Sumit and Bhattacharya, Subhashish and Huang, Alex Q.}, year={2010}, pages={761–767} }