可控换相换流器研制及其工程应用

Development and Engineering Application of Controllable Line Commutated Converter

可控换相换流器是针对常规直流输电换流阀换相失败问题而提出的一种新型直流换流装备,并于2023年6月在±500 kV/1200 MW葛洲坝—上海南桥高压直流输电系统改造工程(简称“葛南直流改造工程”)中投入使用。文中首先阐述了可控换相换流器的技术需求与技术原理,对其技术经济性进行了分析。然后,结合葛南直流改造工程的实施,介绍了可控换相换流器研制、试验及应用情况,提出了可控换相换流器电气参数、结构设计方案、型式试验方案,并结合现场录波介绍了工程调试过程中的低压加压、空载加压、人工短路等关键试验项目和试验结果,以及换流器投运后的运行情况,根据历次交流故障事件现场录波具体分析了换流器动作时序的正确性。最后,对可控换相换流器在特高压直流输电工程、省域交流联络线改造等场景下的应用前景进行了分析,为后续可控换相换流器的进一步推广应用提供参考。

The controllable line commutated converter(CLCC)is a new type of DC converter equipment to solve the commutation failure problem of conventional DC transmission converter valves.In June 2023,CLCC was put into operation in the±500 kV/1200 MW Gezhouba to Shanghai Nanqiao high voltage DC transmission system renovation project(referred to as“Gezhouba-Nanqiao renovation project”)in China.This paper describes the technical requirements and principles of CLCC and analyzes its technical economy.Combined with the implementation of the Gezhouba-Nanqiao renovation project,the development,testing,and application of CLCC are introduced.Then,the electrical parameters,structure design schemes and the type test schemes of CLCC are proposed.The key test items and test results of the low-voltage boosting test,the no-load boosting test,and the artificial short-circuit test during engineering commissioning are introduced in combination with the field recording waveforms.And the operation performance after the project was put into operation is also introduced.According to the field recording waveforms of AC fault events,the correctness of the operation sequence of the converter is analyzed in detail.Finally,the application prospects of CLCC in ultra-high voltage DC transmission projects,provincial AC tie-line renovation,and other scenarios are analyzed,providing a reference for further promotion and application of CLCC.