Publication

Performance Evaluation of Power Reversal in Double-Stage Solid-State Transformers Equipped with Resonant Conversion Stages

2025

Abstract

In double-stage solid-state transformers (SSTs) equipped with resonant DC/DC converters for galvanic isolation, fixed-frequency open-loop operation with a single active bridge has been a straightforward and prevailing design choice in terms of converter efficiency, especially when employing bipolar switching devices. Meanwhile, this prevents the bidirectional power flow capability of the SST, which is essential considering numerous real-world applications. Therefore, to enable the power reversal capability of SSTs with open-loop resonant DC/DC stages, a power reversal method (PRM) is needed that can detect the direction change of the power flow and modify the modulation of the DC/DC converter based on this. This work initially investigates the dynamic interactions of two stages, namely active front-end (AFE) and DC/DC resonant stages, under the presence of power direction change of the SST. Based on the mentioned analysis, a PRM is proposed that takes into account the unique behavior of the opposite slope rates of the primary and secondary DC-link voltages for power reversal detection. The validity of the proposed method and overall dynamic performance of the double-stage SST is established by experimental test results and characterization utilizing the low-voltage power

Official source

https://infoscience.epfl.ch/entities/publication/bab054fd-674c-4fac-802b-c5bdd1826cbb

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2025

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/bab054fd-674c-4fac-802b-c5bdd1826cbb

About this result

Related concepts (32)

Rectifier

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The reverse operation (converting DC to AC) is performed by an inverter. The process is known as rectification, since it "straightens" the direction of current. Physically, rectifiers take a number of forms, including vacuum tube diodes, wet chemical cells, mercury-arc valves, stacks of copper and selenium oxide plates, semiconductor diodes, silicon-controlled rectifiers and other silicon-based semiconductor switches.

Switched-mode power supply

A switched-mode power supply (switching-mode power supply, switch-mode power supply, switched power supply, SMPS, or switcher) is an electronic power supply that incorporates a switching regulator to convert electrical power efficiently. Like other power supplies, an SMPS transfers power from a DC or AC source (often mains power, see AC adapter) to DC loads, such as a personal computer, while converting voltage and current characteristics.

Power inverter

A power inverter, inverter or invertor is a power electronic device or circuitry that changes direct current (DC) to alternating current (AC). The resulting AC frequency obtained depends on the particular device employed. Inverters do the opposite of rectifiers which were originally large electromechanical devices converting AC to DC. The input voltage, output voltage and frequency, and overall power handling depend on the design of the specific device or circuitry. The inverter does not produce any power; the power is provided by the DC source.

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Performance Evaluation of Power Reversal in Double-Stage Solid-State Transformers Equipped with Resonant Conversion Stages

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