| Summary: | [Introduction] In flexible HVDC transmission systems, HVDC converter valve power modules and their spares are tested and maintained at regular intervals. The power modules in good condition are essential to assure the safe and steady operation of flexible HVDC transmission systems. [Method] Firstly the structure, working mechanism and shop test items of power modules were analyzed in view of the shortage of relevant specifications and standards for power modules on-site test. Then a power module test method suitable for actual situation on site was proposed. Based on the proposed method, a device able to test power modules automatically was developed. [Result] The proposed test method and device effectively improve the completeness, efficiency and accuracy of power module on-site test, which is applied in Sucheng converters station of Nan′ao multi-terminal HVDC flexible system. [Conclusion] The engineering practice indicates that the proposed method provides an effective way for the power module test tasks during the phase of operation, maintenance and inspection, which is close to the actual test situation on site. Moreover, the proposed method and device provide a reference for the power module test tasks of other flexible HVDC transmission systems.
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