@misc{won_srdic_lukic_2022, title={Optimized Multi-Carrier PWM Strategy and Topology Review for Multi-Cell Series-Parallel Medium-Voltage Rectifier}, volume={10}, ISSN={["2168-6785"]}, DOI={10.1109/JESTPE.2021.3129797}, abstractNote={Solid-state transformer (SST) acting as a medium-voltage (MV) rectifier is a viable solution to supply low-voltage DC (LVDC) loads directly from the MV ac grid. Different from a classical boost-derived power-factor-correction (PFC) topology, the multicell series-parallel (MCSP) converter steps down and distributes the input ac voltage by multiple switching cells while providing the PFC function. We propose an optimized multicarrier pulsewidth modulation (PWM) strategy to avoid unwanted modes by modified multicarrier waveforms for ensuring frequent parallel connectivity to improve balancing effect while preserving simple current control implementation. Compared with conventional phase-shifted (PS) PWM and other modified multilevel carrier methods, the proposed method has no adverse effect on the input current distortion and optimizes the balancing effect on the capacitor voltages resulting suppressed circulating currents. Effectively reduced current stresses on the switch devices could lead a reduction of conduction loss on the device. Topology discussion, circulating currents, digital implementation, and loss analysis are provided. Finally, the superiority of the proposed PWM method is validated by thermal-based simulation presenting a power loss breakdown and comparing with other PWM methods. A full-scale prototype is developed, and the experimental outcomes verify the remarkable performance of proposed PWM scheme in balanced and even suppressed switch currents with improved system efficiency.}, number={6}, journal={IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS}, author={Won, Jehyuk and Srdic, Srdjan and Lukic, Srdjan M.}, year={2022}, month={Dec}, pages={6770–6783} }
 @article{won_jalali_liang_zhang_srdic_lukic_2019, title={Auxiliary Power Supply for Medium-Voltage Power Converters: Topology and Control}, volume={55}, ISSN={["1939-9367"]}, DOI={10.1109/TIA.2019.2915511}, abstractNote={This paper presents an isolated auxiliary power supply for medium-voltage power electronics systems. The proposed converter comprises two stages: a non-isolated ac/dc stage that connects directly to the medium-voltage line, and an isolated dc/dc stage that provides 100-W output power at 24 V, with 10 kV isolation. The proposed modular ac/dc stage uses just one active semiconductor device per module, features an internal capacitor voltage balancing, and achieves power factor correction by employing predictive current control. High switching frequency operation of both converter stages enable a reduction in system size and weight when compared to traditional low-frequency transformer-based approach. The proposed converter is simulated and its operation is validated experimentally on a 100-W prototype.}, number={4}, journal={IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS}, author={Won, Jehyuk and Jalali, Gholamreza and Liang, Xinyu and Zhang, Chi and Srdic, Srdjan and Lukic, Srdjan M.}, year={2019}, pages={4145–4156} }
 @article{tu_feng_srdic_lukic_2019, title={Extreme Fast Charging of Electric Vehicles: A Technology Overview}, volume={5}, ISSN={["2332-7782"]}, DOI={10.1109/TTE.2019.2958709}, abstractNote={With the number of electric vehicles (EVs) on the rise, there is a need for an adequate charging infrastructure to serve these vehicles. The emerging extreme fast-charging (XFC) technology has the potential to provide a refueling experience similar to that of gasoline vehicles. In this article, we review the state-of-the-art EV charging infrastructure and focus on the XFC technology, which will be necessary to support the current and future EV refueling needs. We present the design considerations of the XFC stations and review the typical power electronics converter topologies suitable to deliver XFC. We consider the benefits of using the solid-state transformers (SSTs) in the XFC stations to replace the conventional line-frequency transformers and further provide a comprehensive review of the medium-voltage SST designs for the XFC application.}, number={4}, journal={IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION}, author={Tu, Hao and Feng, Hao and Srdic, Srdjan and Lukic, Srdjan}, year={2019}, month={Dec}, pages={861–878} }
 @article{srdic_lukic_2019, title={Toward Extreme Fast Charging}, volume={7}, ISSN={["2325-5897"]}, DOI={10.1109/MELE.2018.2889547}, abstractNote={With an increasing awareness of the detrimental effects of the fossil fuel?based transportation sector, which accounts for 14% of human-made greenhousegas emissions globally, individuals, companies, and government entities have made a concerted push to develop solutions to provide modes of transportation that are less carbon intensive. Importantly, several countries, including Norway, India, France, and Britain, have decided to end the sale of internal combustion engine cars in the near future, further accelerating the shift to electric transportation.}, number={1}, journal={IEEE ELECTRIFICATION MAGAZINE}, author={Srdic, Srdjan and Lukic, Srdjan}, year={2019}, month={Mar}, pages={22–31} }
 @inproceedings{won_jalali_liang_zhang_srdic_lukic_2018, title={Auxiliary power supply for medium-voltage power electronics systems}, DOI={10.1109/apec.2018.8341005}, abstractNote={This paper presents an auxiliary power supply for medium-voltage (MV) power electronics systems, based on modular multilevel series-parallel converter (MMSPC). The converter connects to 2.4 kV RMS at the input, and produces 24 V dc at the output, providing 100 W of power with 10 kV isolation. Unlike the traditional solutions which use a grid-frequency bulky and heavy potential transformers, the proposed converter can operate at higher switching frequencies, thus reducing the weight and providing higher power density, compared to the traditional approach. Additionally, the proposed converter features an internal capacitor voltage balancing and achieves power factor correction (PFC) by using predictive control. The proposed converter is simulated and its operation is experimentally validated on the developed prototype at low input voltage.}, booktitle={Thirty-third annual ieee applied power electronics conference and exposition (apec 2018)}, author={Won, J. and Jalali, G. and Liang, X. Y. and Zhang, C. and Srdic, S. and Lukic, S.}, year={2018}, pages={173–179} }
 @book{dc distribution systems and microgrids_2018, volume={115}, ISBN={["978-1-78561-382-1"]}, DOI={10.1049/PBPO115E}, journal={DC DISTRIBUTION SYSTEMS AND MICROGRIDS}, year={2018}, pages={1–449} }
 @article{liang_zhang_srdic_lukic_2018, title={Predictive Control of a Series-Interleaved Multicell Three-Level Boost Power-Factor-Correction Converter}, volume={33}, ISSN={["1941-0107"]}, DOI={10.1109/TPEL.2017.2780244}, abstractNote={This paper presents a new predictive power-factor-correction (PFC) controller for series-interleaved three-level boost (TLB) converters. Compared to the state-of-the-art TLB PFC controllers, where a two-cycle prediction and a detection of an operating region are necessary, the proposed controller achieves a low total harmonic distortion of the input current by using a single equation to predict the input current in all operating regions of the converter, in just one operating cycle. The average current control is achieved by sampling at the peak of the triangular carrier. The proposed PFC controller significantly reduces the distortion of the input ac current near the zero-crossing points, resulting in a low total harmonic distortion of the input current. The operation of the proposed controller was evaluated, and its stability and robustness to parameter changes was confirmed analytically. The controller operating principles were verified in simulations and validated by experiments on a medium-voltage 50-kW converter prototype.}, number={10}, journal={IEEE TRANSACTIONS ON POWER ELECTRONICS}, author={Liang, Xinyu and Zhang, Chi and Srdic, Srdjan and Lukic, Srdjan M.}, year={2018}, month={Oct}, pages={8948–8960} }
 @inproceedings{srdic_liang_zhang_yu_lukic_2016, title={A SiC-based high-performance medium-voltage fast charger for plug-in electric vehicles}, DOI={10.1109/ecce.2016.7854777}, abstractNote={This paper presents an isolated medium-voltage, high-power-quality and high efficiency (over 96%), fast charger for plug-in electric vehicles. The proposed fully modular fast charger uses off-the-shelf Silicon Carbide (SiC) power devices to convert the rectified single-phase 2.4 kV medium-voltage input to variable dc output. The adopted input-series-output-parallel unidirectional topology enables converter scalability in both the input voltage and the output power. Using wide bandgap (WBG) power devices enables 9 times reduction in volume and 6 times reduction in weight, compared to the state-of-the-art fast chargers, while exceeding the efficiency of the state-of-the-art fast chargers by more than 1.5% Based on the system requirements, the appropriate converter topology was selected, its operation was simulated and validated by experiments on the developed fast charger prototype.}, booktitle={2016 ieee energy conversion congress and exposition (ecce)}, author={Srdic, S. and Liang, X. Y. and Zhang, C. and Yu, Wensong and Lukic, Srdjan}, year={2016} }
 @inproceedings{srdic_zhang_liang_yu_lukic_2016, title={A SiC-based power converter module for medium-voltage fast charger for plug-in electric vehicles}, DOI={10.1109/apec.2016.7468247}, abstractNote={This paper presents an isolated power converter module for medium-voltage (2.4 kV), high-power-quality (PF ≥ 0.98, current THD ≤ 2%), 50 kW fast charger for plug-in electric vehicles. The proposed high-efficiency (above 96%), and reduced-footprint converter module utilizes off-the-shelf Silicon Carbide (SiC) devices to step down the rectified single-phase medium-voltage input. The developed module can also serve as a building block for other medium voltage rectifier applications, including power supplies for data centers and other dc power distribution systems. Based on the system requirements, the appropriate unidirectional converter topology was selected, its operation was simulated and validated by experiments on the developed converter prototype.}, booktitle={Apec 2016 31st annual ieee applied power electronics conference and exposition}, author={Srdic, S. and Zhang, C. and Liang, X. Y. and Yu, Wensong and Lukic, Srdjan}, year={2016}, pages={2714–2719} }