Network configuration converter fault ride-through method and system suitable for symmetrical fault

By employing reactive power synchronization control and power angle compensation strategies, the reactive power support problem of grid-type converters during symmetrical faults was solved, achieving stable reactive power tracking and rapid recovery, suppressing transient overvoltages, and ensuring the stable operation of the converter.

CN122000899BActive Publication Date: 2026-07-24HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Filing Date
2026-04-09
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing grid-type converters cannot provide sufficient reactive power support that complies with grid operation criteria during symmetrical faults, and the calculation process is complicated, leading to excessive output current or power angle instability.

Method used

The reactive power synchronization control method is adopted. By obtaining the reactive power reference value of the grid converter, the reactive power synchronization mode is switched. During the fault clearing period, the power angle compensation strategy is introduced to ensure stable reactive power tracking and phase difference recovery, thereby achieving stable reactive power supply.

Benefits of technology

During faults, reactive power support that conforms to grid operation criteria is provided, reducing the amount of calculation. The phase difference is quickly restored through the power angle compensation strategy, suppressing transient overvoltage phenomena and ensuring that the converter smoothly transitions to normal operation.

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Abstract

The application discloses a network-constructing converter fault ride-through method and system suitable for symmetrical faults, and belongs to the technical field of network-constructing converter fault ride-through. The application replaces the role of active synchronous control of the converter power angle during the fault period with reactive synchronous, and uses the reactive power demand derived according to the power grid operation criterion as the reactive power target of the network-constructing converter during the fault ride-through period, so that stable tracking of the actual value and the reference value of the reactive power during the fault period is realized. The application has small calculation amount, and enables the network-constructing converter to have sufficient and suitable reactive voltage support capability while maintaining good synchronous stability. In addition, the application also proposes a strategy of restoring power angle compensation for the transient overvoltage problem of the network-constructing converter reactive synchronous control strategy during the fault clearance period, so that the transient overvoltage phenomenon during the recovery period is inhibited, and the network-constructing converter can smoothly transit to the normal operation state.
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