Power conversion system

The use of solid state transformers with medium frequency transformers addresses the bulkiness and safety issues of conventional transformers, enabling efficient and safe high-power conversion for industrial applications.

WO2025153165A1 Publication Date: 2025-07-24ABB (SCHWEIZ) AG
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Patent Information

Application Number
PCT/EP2024/050809
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Filing Date
2024-01-15
Publication Date
2025-07-24

AI Technical Summary

Technical Problem

Conventional low frequency transformers used for interconnecting electrical appliances with different voltage levels are bulky, heavy, and pose a fire hazard due to flammable oil, necessitating a downsized and safer power conversion system.

Method used

A power conversion system utilizing solid state transformers (SSTs) with medium frequency transformers (MFTs) for galvanic isolation, comprising interconnected SST cells in parallel or series configurations, eliminating the need for low frequency transformers.

Benefits of technology

The system provides efficient power conversion without bulky transformers, reduces fire hazards, and enhances flicker performance while eliminating the need for additional reactive power compensators like STATCOM, achieving high-power supply to industrial loads.

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Abstract

A power conversion system (1) comprises a rectifier circuit (11) for converting an AC voltage to a distribution bus voltage; a solid state transformer, SST, (30) having an input side DC link (20), an internal medium frequency AC link (502), and an output side DC link (535 ), the SST (30) being configured for converting between the distribution bus voltage on the input side (501) and a DC target voltage on the output side (503), the SST (30) including at least one medium frequency transformer, MFT (511), in the AC link (502) for galvanic isolation, wherein the SST (30) includes multiple solid state transformer, SST, cells interconnected on the input side (501), the interconnection including a parallel connection, a series connection, or a combination thereof.
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