Method, system and computer device for ac fault ride through of hvdc receiving end

By sending a fault signal from the receiving-end converter to the sending-end converter when the receiving-end AC system fails, switching to the capacitor voltage average value control mode, the capacitor voltage of the sending-end converter is stabilized, thus solving the problem of voltage fluctuation in the sending-end converter caused by the receiving-end AC system failure and improving the stability of the sending-end AC system.

CN115173457BActive Publication Date: 2026-05-19MAINTENANCE & TEST CENTRE CSG EHV POWER TRANSMISSION CO
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Patent Information

Application Number
CN202210794834.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-07-07
Publication Date
2026-05-19
Estimated Expiration
2042-07-07

AI Technical Summary

Technical Problem

When the receiving-end AC system fails, the capacitor voltage of the sending-end converter fluctuates greatly, posing a safety hazard. Existing technologies are unable to effectively stabilize the capacitor voltage.

Method used

When the AC system at the receiving end fails, the fault signal is sent to the sending end converter through the receiving end converter, and the converter switches to the average capacitor voltage control mode. The output power of the DC side of the sending end converter is controlled based on the average capacitor voltage until the capacitor voltage stabilizes.

Benefits of technology

It stabilized the capacitor voltage of the sending-end converter, improved the stability of the sending-end AC system, and avoided safety hazards caused by voltage fluctuations.

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Abstract

The application relates to a flexible direct-current receiving-end alternating-current fault ride-through method, a system, a computer device, a storage medium and a computer program product. The method comprises the following steps: when a receiving-end alternating-current fault signal of a receiving-end alternating-current system is received, a sending-end converter is controlled to be switched to a capacitor voltage average value control mode; a capacitor voltage average value of the sending-end converter and a capacitor voltage reference value of the sending-end converter are acquired; a target sending-end direct-current voltage reference value of the sending-end converter is determined according to the capacitor voltage average value and the capacitor voltage reference value; the sending-out power of the direct-current side of the sending-end converter is controlled according to the target sending-end direct-current voltage reference value until the capacitor voltage of the sending-end converter is in a stable state, and the capacitor voltage average value control mode is exited. The method can solve the capacitor voltage fluctuation problem of the sending-end converter after the sending-end converter is input into a direct-current energy consumption device, and improves the stability of the sending-end alternating-current system.
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