In two-stage solid-state transformers (SSTs) equipped with LLC DC/DC converters for galvanic isolation, fixed-frequency open-loop operation of LLC stages has been a straightforward and prevailing design choice. Meanwhile, with a closed-loop-operated LLC co ...
Institute of Electrical and Electronics Engineers (IEEE)2025
Grid regulation capacities of Pumped Storage Hydropower Plants (PSHPs) are of great importance for today’s and future power supply systems. In this context, variable speed technologies provide solutions for enhanced operational flexibility of PSHP units. E ...
Modularized Bridge Rectifier (mBR) is a promising solid-state transformer (SST) topology that replaces
active front-end stages with diodes and utilizes multiple isolated DC/DC converters. This paper investigates
magnetic integration schemes to mitigate the ...
There are numerous ways to tackle the design optimization problem of inductive devices, being it a transformer or an inductor. The problem is generally nonlinear, nonconvex, and comprises a mix of continuous and discrete variables which makes it rather a d ...
The fixed-frequency operated LLC converters can provide a fixed voltage gain with galvanic isolation between the input and output. However, when applied in two-stage AC/DC converters, the equivalent current that flows through the LLC converter, which corre ...
Institute of Electrical and Electronics Engineers (IEEE)2025
Series Resonant Converters allow an efficient, galvanically isolated, and load-independent DC/DC conversion, and can be used as isolation DC/DC units in two-stage single-phase AC/DC converters. However, in such systems, the single-phase Active Front End un ...
Institute of Electrical and Electronics Engineers (IEEE)2025
The concept of MVDC collection network for renewable applications requires a high efficiency DC-DC converter to connect low voltage sources to the medium voltage network. The accurate measurement of low power losses is not possible with traditional electri ...
Institute of Electrical and Electronics Engineers2025
The dual-channel gate driver (D-GD) is widely employed in the industry to support the extensive adoption of half-bridge power modules. With the growing popularity of silicon-carbide (SiC) devices in medium-voltage scenarios known for their superior switchi ...
Institute of Electrical and Electronics Engineers (IEEE)2025
This paper presents a robust design of a megawattscale medium-voltage (MV) direct current transformer (DCT) that features a bidirectional LLC resonant converter topology. This topology harnesses the inherent ability to control power flow seamlessly between ...
To improve the efficiency of inductive power transfer (IPT) systems, it is beneficial to maximize the power transfer by enhancing the quality factor of coils and the coupling between them. Therefore, it is crucial to rely on accurate, flexible, and practic ...
Series connection of Silicon carbide (SiC) MOSFETs is needed for increasing the blocking voltage of available power devices (limited to 3.3 kV in the market) and has been extensively studied, particularly in the context of voltagebalancing design during no ...
Modularized Bridge Rectifier (mBR) is a promising architecture of single-stage solid-state transformer. Without the presence of AC/DC active rectifier, the system performance solely depends on the control and optimization of isolated DC/DC converters. This ...
Solid-state transformers with input-series outputparallel structures are being considered for a variety of applications requiring MVAC to LVDC conversion. Due to the singlephase AC/DC conversion at the input side, all floating cells of the solid-state tran ...
The demonstration of flexibility technologies to enhance ancillary services of Hydropower Plants (HPPs) is showcased by the XFLEX HYDRO H2020 European Project. The potential of Full Size Frequency Converters (FSFC) is numerically and experimentally assesse ...
Impedance estimation is an important tool for grid- converter interaction evaluation. Using existing grid-connected converters for perturbation injection enables grid impedance estimation during operation without additional hardware (namely dedicated pertu ...
Solid-State Transformers with Input-Series/Output- Parallel configuration offer a convenient solution for AC/DC power conversion, thanks to their modularity, scalability and flexibility. However, as known, they are affected by a second-order harmonic rippl ...
