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Modular Multilevel Converter Circulating Current Control with Single Active Filter Module per Phase
(2021)2021 22nd IEEE International Conference on Industrial Technology (ICIT)Phase-legs of DC/AC modular multilevel converters (MMC, M2LC) transfer power from the DC input to the corresponding phase output terminal by means of a current that circulates through the DC input and the phase-leg. In addition to the load-dependent DC component required for the power transfer, this circulating current contains significant harmonics if no countermeasures are implemented. Prominently, a large second harmonic appears, ...Conference Paper -
“Pushing Power Through Walls” - Wireless Power Transfer Through Stainless Steel
(2021)2021 24th International Conference on Electrical Machines and Systems (ICEMS)This paper focuses on wireless power transfer (WPT) through an electrically conductive stainless steel (SS) enclosure necessary for high-purity environments such as required for chemical or pharmaceutical industry. The alternating electromagnetic field penetrates the SS and induces eddy currents that are opposing the field of the primary coil and reduce the coupling and efficiency of the WPT system. Considering a WPT system with E-core ...Conference Paper -
Next-Generation SiC/GaN Three-Phase Variable-Speed Drive Inverter Concepts
(2021)PCIM Europe digital days 2021Variable-speed drive (VSD) systems should feature high power density and low installation costs, offer wide input and/or output voltage/motor speed ranges and ensure low EMI without requiring shielded motor cables. Accordingly, next-generation high-switching-frequency SiC/GaN PWM inverters should integrate LC output filters and generate continuous output voltages to prevent conducted or radiated EMI, reflections on long motor cables, ...Conference Paper -
Synergetic Control of Three-Phase AC-AC Current-Source Converter Employing Monolithic Bidirectional 600 V GaN Transistors
(2021)2021 IEEE 22nd Workshop on Control and Modelling of Power Electronics (COMPEL)AC-AC current-source converters (CSCs) are an interesting alternative to the widely-used voltage-source converters for next-generation motor drive applications, as they inherently feature continuous output voltages and minimum filter effort. This mitigates issues such as reflections on long motor cables, high-frequency motor losses, the need for expensive shielded motor cables, and common-mode currents that damage motor bearings. In this ...Conference Paper -
Performance Evaluation of Future T-Type PFC Rectifier and Inverter Systems with Monolithic Bidirectional 600 V GaN Switches
(2021)2021 IEEE Energy Conversion Congress and Exposition (ECCE)Three-phase PFC rectifier and inverter systems can be realized using identical main converter stages (MCSs) that comprise three three-level T-Type (TT) bridge-legs and a DC-bus referenced LC-filter stage. TT bridge-legs advantageously realize three output voltage levels by extending a half-bridge with the possibility to connect the switch node to the capacitive DC-link midpoint. To do so, a switching device with bipolar voltage blocking ...Conference Paper -
Advanced Synergetic Charge Control of Three-Phase PFC Buck-Boost Current DC-Link EV Chargers
(2022)2022 IEEE 23rd Workshop on Control and Modeling for Power Electronics (COMPEL)An advanced synergetic charge-based mains cur-rent control (ASC) for three-phase power factor correction (PFC) buck-boost current DC-link AC/DC converters, which integrate a front-end buck-type current DC-link PFC rectifier and a DC/DC boost converter output stage, is proposed. The charge control is embedded in the synergetic (coordinated) control of the two converter stages, retaining all advantageous features such as only a minimum ...Conference Paper -
Comparative Evaluation of ARCP and Three-Level TCM Soft-Switching Bridge-Legs for High-Frequency SiC Converter Systems
(2022)2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)Soft-switching bridge-legs facilitate high-efficiency three-phase PV inverters or PFC rectifiers. By extending a half-bridge with a resonant auxiliary circuit, including two additional transistors, zero-voltage switching (ZVS) of the main transistors can be realized (Active Resonant Commutated Pole, ARCP). Alternatively, a similar T-type bridge-leg structure achieves ZVS by operating the output filter inductor with a sufficiently high ...Conference Paper -
Comparative Evaluation of Three-Phase AC-AC Voltage/Current-Source Converter Systems Employing Latest GaN Power Transistor Technology
(2022)2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)The emergence of monolithic bidirectional GaN power transistors sparks renewed interest in AC-AC current source converters (CSCs) as an alternative to AC-AC voltage source converters (VSCs) for motor drive applications. This paper compares the two approaches with the CSC utilizing novel 600 V, 140 m Omega monolithic bidirectional CaN transistors. Aiming for a comparison of next-generation plug-and-play motor drives, both systems must ...Conference Paper -
Comparative Evaluation of MVAC-LVDC SST and Hybrid Transformer Concepts for Future Datacenters
(2022)2022 International Power Electronics Conference (IPEC-Himeji 2022- ECCE Asia)A transition from state-of-the-art 400 V AC to 690 V AC or 800 V DC (+/- 400 V DC) distribution improves the overall power conversion efficiency of datacenter power supply systems. The latter requires megawatt-level isolated medium-voltage (MV) AC to low-voltage (LV) DC conversion stages that operate with an efficiency of at least 98 AD. Whereas today's most advanced industrial MVAC-LVDC solid-state transformer (SST) prototypes do achieve ...Conference Paper -
Design Aspects of Three-Phase Current-Source Converter Commutation Cells with Monolithic Bidirectional GaN Transistors
(2022)2022 IEEE Energy Conversion Congress and Exposition (ECCE)The recent availability of novel monolithic bidirectional GaN switches (MBDSs) renders current-source converters (CSCs) with their inherently sinusoidal output voltages an interesting alternative to voltage-source converters (VSCs) for future motor-friendly variable-speed drives (VSDs). However, CSC commutation cells contain three MBDSs and hence obtaining low-inductance and symmetric PCB layouts is more challenging. Furthermore, CSCs ...Conference Paper