Publication

Comprehensive Comparison of the Single-Phase and Three-Phase Unidirectional DC/DC Converters for High-Power Medium-Voltage Applications

2026

Abstract

This paper presents a comprehensive evaluation and comparison of two isolated unidirectional DC/DC converter topologies – the single-phase Phase-Shifted Full Bridge converter (PSFB) and the three-phase DC/DC converter (3-ph DC/DC), for high-power applications such as MVDC collection grids. The operating principles and key differences between the two converters are presented in detail. Imposing identical technical specifications, the two converters are optimized separately, considering the performance of the switching stages under a wide range of operating conditions. The optimal designs are then juxtaposed, clearly showing the design trade-offs between the two topologies, including the Medium Frequency Transformer (MFT) and output filter design. The implications of the wide input voltage regulation range on the performance are discussed in detail, and the dynamic behavior under closed-loop control is shown through simulations and validated on reduced-scale converter prototypes.

Official source

https://infoscience.epfl.ch/entities/publication/e914b1f1-39f4-4c24-943c-d15d27307e0f

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2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/e914b1f1-39f4-4c24-943c-d15d27307e0f

About this result

Related concepts (32)

High-voltage direct current

A high-voltage direct current (HVDC) electric power transmission system (also called a power superhighway or an electrical superhighway) uses direct current (DC) for electric power transmission, in contrast with the more common alternating current (AC) transmission systems. Most HVDC links use voltages between 100 kV and 800 kV. However, a 1,100 kV link in China was completed in 2019 over a distance of with a power capacity of 12 GW. With this dimension, intercontinental connections become possible which could help to deal with the fluctuations of wind power and photovoltaics.

Power electronics

Power electronics is the application of electronics to the control and conversion of electric power. The first high-power electronic devices were made using mercury-arc valves. In modern systems, the conversion is performed with semiconductor switching devices such as diodes, thyristors, and power transistors such as the power MOSFET and IGBT. In contrast to electronic systems concerned with the transmission and processing of signals and data, substantial amounts of electrical energy are processed in power electronics.

Three-phase electric power

Three-phase electric power (abbreviated 3φ) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. It is a type of polyphase system employing three wires (or four including an optional neutral return wire) and is the most common method used by electrical grids worldwide to transfer power. Three-phase electrical power was developed in the 1880s by several people. In three-phase power, the voltage on each wire is 120 degrees phase shifted relative to each of the other wires.

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Comprehensive Comparison of the Single-Phase and Three-Phase Unidirectional DC/DC Converters for High-Power Medium-Voltage Applications

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