A medium-voltage direct-hanging solid-state transformer topology based on wide-bandgap semiconductor devices and matrix converter and a control method thereof

By combining a high-frequency chain architecture of a matrix converter without intermediate DC links with wide bandgap semiconductor devices and adopting a hierarchical collaborative control strategy, the topological complexity and reliability issues of medium-voltage solid-state transformers in medium-voltage direct-connection scenarios are solved. This results in a high-frequency, miniaturized, and high-efficiency medium-voltage direct-connection solid-state transformer that is suitable for various medium-voltage levels and power requirements.

CN122437358APending Publication Date: 2026-07-21YICHANG POWER SUPPLY CO OF STATE GRID HUBEI ELECTRIC POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YICHANG POWER SUPPLY CO OF STATE GRID HUBEI ELECTRIC POWER CO LTD
Filing Date
2026-04-10
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing medium-voltage solid-state transformers have problems such as complex topology, difficulty in balancing device withstand voltage and high-frequency characteristics, high coupling between control and protection, and insufficient system reliability in medium-voltage direct connection scenarios. In particular, the modular multilevel scheme has a large number of sub-modules, complex and costly voltage and current sharing control, and lacks a modular cascaded matrix transformation topology suitable for medium-voltage direct connection and a sound fault-tolerant control.

Method used

It adopts a high-frequency chain architecture of matrix converter without intermediate DC link, combined with wide bandgap semiconductor devices and modular cascade design, and is equipped with a hierarchical collaborative control strategy, including medium voltage input unit, matrix converter unit, high frequency isolation resonant unit, low voltage output conversion unit and detection drive control unit. Through improved space vector modulation and four-step safe commutation strategy, it achieves high frequency, miniaturization and high reliability.

Benefits of technology

It achieves a reduction in system size and losses, an increase in power density, an improvement in power quality, and an enhancement in system reliability. It is adaptable to different medium voltage levels of 10kV/35kV and different power levels of 50kW-500kW, meeting the requirements of industrial applications.

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Abstract

The application belongs to the technical field of power electronic conversion and electric energy conversion equipment. A medium-voltage direct-hanging solid-state transformer topology based on a wide-bandgap semiconductor device and a matrix converter, characterized in that it comprises a medium-voltage input unit, a matrix converter unit, a high-frequency isolation resonance unit, a low-voltage output conversion unit, and a detection, driving and control unit, each unit being electrically connected and functionally cooperative. The control method comprises the following steps: step S1, system initialization and self-checking; step S2, soft start and synchronous link building; step S3, matrix conversion and safe commutation control; step S4, high-frequency isolation and voltage stabilization control; step S5, low-voltage side output closed-loop control; step S6, balance and thermal management control; and step S7, fault handling and shutdown control. The topology structure and control method can reduce the system volume and loss, improve the power density and operating efficiency, and enhance the electric energy quality and system reliability.
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