Parallel fault-tolerant type converter bus short circuit current limiting method and system

By establishing differential equations in the parallel converter to calculate virtual resistance and virtual inductance, precise control of the converter's short-circuit current is achieved, solving the problem of unsatisfactory current limiting effect during bus short-circuit faults and improving the system's safety and stability.

CN120811097BActive Publication Date: 2026-06-23HUANENG RUDONG BAXIANJIAO OFFSHORE WIND POWER GENERATION CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUANENG RUDONG BAXIANJIAO OFFSHORE WIND POWER GENERATION CO LTD
Filing Date
2025-07-15
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In existing technologies, parallel converters have poor current limiting effect and slow response speed when the bus short circuit fault occurs, which leads to equipment damage and system instability.

Method used

By establishing the differential equation of wind power generation voltage, calculating the periodic and non-periodic components, introducing virtual resistance and virtual inductance, calculating the converter short-circuit current, and using the virtual resistance and virtual inductance values ​​for current limiting control, the converter can be ensured to operate according to the expected current characteristics under short-circuit fault conditions.

Benefits of technology

It effectively limits the short-circuit current of the converter bus, prevents fault propagation, improves the safety and stability of the system, enhances fault tolerance, and reduces equipment damage.

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Abstract

The application discloses a parallel fault-tolerant type converter bus short-circuit current limiting method and system, and relates to the technical field of wind power generation. The application establishes a differential equation of wind power generation voltage under normal state, obtains periodic components and non-periodic components of the differential equation when a short-circuit fault occurs in a converter of wind power generation, calculates the relationship between the periodic components and normal current before the fault through the reactive power characteristics when the converter is short-circuited, obtains a result expression of the periodic components, introduces virtual resistance and virtual inductance, orients the reference voltage of the converter, and calculates the virtual resistance and virtual inductance values meeting the requirement of reactive current injection based on the reference voltage, d-axis and q-axis components of the converter current. The application can effectively limit the short-circuit current of the converter bus, and can take corresponding protection measures when a short-circuit fault occurs in the converter of wind power generation, thereby protecting the converter and other devices in wind power generation.
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