柔性直流输电换流阀功率单元现场测试方法研究

Research on on-Site Test Method for Flexible HVDC Converter Valve Power Module

[目的]在柔性直流输电工程中,换流阀功率单元及其备件需要定期进行测试和维护。功率单元工作正常是保证柔性直流输电系统安全稳定运行的重要前提。[方法]针对功率单元现场测试缺乏相关规范标准的现状,从功率单元的结构、工作机制和厂内测试项目入手,结合现场实际情况,提出了一种适用于现场的流程化的功率单元测试方法,并在该方法的基础上研制了一台可对功率单元进行自动测试的装置。[结果]所提出的测试方法和测试装置可有效提高功率单元现场测试的完备性、效率及准确性,该装置目前已在南澳多端柔性直流输电工程塑城换流站试点应用。[结论]工程实践表明:提出的测试方法贴近工程实际情况,为功率单元的运检、验收提供了有效的测试手段,也可为其他柔性直流输电工程的功率单元测试工作提供借鉴。

[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.