Discharge method of flexible direct current converter valve operation test system

By employing a combination of a specific current modulation mode and an emergency resistor mode in a flexible DC converter valve, the problems of long discharge time and safety hazards of traditional discharge methods are solved, achieving rapid and safe discharge and improving test efficiency and safety.

CN117081374BActive Publication Date: 2026-07-28XIDIAN POWER RECTIFIER XIAN +1
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Patent Information

Application Number
CN202311021915.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-14
Publication Date
2026-07-28
Estimated Expiration
2043-08-14

AI Technical Summary

Technical Problem

After a test or failure, the traditional discharge method for existing flexible DC converter valves is time-consuming, resulting in low test efficiency and safety hazards. Furthermore, existing improved methods may increase costs or fail to discharge quickly.

Method used

It continues to discharge after a shutdown command by adopting a specific current modulation mode. Through equalization speed and priority discharge strategy, combined with current and switching frequency adjustment, it achieves rapid discharge and adopts internal resistance mode in emergency situations to ensure safety.

Benefits of technology

It improves the discharge rate of flexible DC converter valve testing, reduces waiting time, enhances production efficiency and safety, avoids human error, adapts to various emergencies, and ensures safe production.

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Abstract

The present application relates to the technical field of flexible direct current transmission, and particularly relates to a discharge method of a flexible direct current converter valve operation test system, when a stop command is issued, all power modules of the flexible direct current converter valve continue to operate discharge according to the stop command in a specific current modulation mode, until all the power modules are at the lowest set voltage, and then static discharge is performed until the voltage of all the power modules drops to a safe voltage, that is, the discharge is completed; wherein the specific current is a current less than 50% of the rated current. The stop and lock discharge strategy adopted in the present application does not require an additional discharge device, improves the discharge rate of the flexible direct current converter valve test, reduces the flexible direct current converter valve discharge waiting time, improves the production and test efficiency of the flexible direct current converter valve equipment, improves the design and type test verification speed, and improves the production routine test capacity.
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