Power conversion system and method for fault protection thereof

By setting a series capacitor and a protection unit on the first side of the power conversion unit, a voltage divider protection branch is constructed, which solves the problem of the inability to quickly disconnect the DC bus when it is faulty under high voltage operation, and realizes rapid fault blocking and improved system stability.

CN122599951APending Publication Date: 2026-08-18SHANGHAI SIGE DIGITAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202610977306.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-07-01
Publication Date
2026-08-18

AI Technical Summary

Technical Problem

Under high-voltage operating conditions, the fault path cannot be quickly cut off when the DC bus fails, resulting in the spread of fault energy and severely reducing the operational stability and reliability of the power conversion system.

Method used

At least two capacitors connected in series are provided on the first side of the power conversion unit, and a protection unit is provided between it and the DC bus, including first and second protection units, which disconnect the power conversion unit from the DC bus in case of a fault through a voltage divider protection branch.

Benefits of technology

Under high-voltage conditions, it can quickly block the fault propagation path, avoid system shutdown or equipment damage, reduce the voltage withstand requirements of switching transistors, reduce the cost of high-voltage power devices, and improve system reliability and safety.

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Abstract

The application discloses a power conversion system and a fault protection method thereof, and relates to the technical field of electronic power, which comprises the following steps: a power conversion unit is provided with at least two capacitors on the first side, and an intermediate node is formed between two adjacent capacitors; a first protection unit and a second protection unit are arranged between the first side of the power conversion unit and a DC bus; the first protection unit is connected with the positive electrode of the first side of the power conversion unit, the positive DC bus and at least one intermediate node, the second protection unit is connected with the negative electrode of the first side of the power conversion unit, the negative DC bus and at least one intermediate node, and the first and second protection units are connected with the capacitors to form a voltage division protection branch; and in the case of a DC bus fault, the connection between the power conversion unit and the DC bus is cut off through the protection unit. The application can cut off the fault path quickly, block the diffusion path of the fault and prevent the fault from spreading in a large range under the high-voltage operation condition.
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