增强型电网换相换流器的关断角测量控制方法

Extinction Angle Measurement and Control Method for Evolutional Line Commutated Converter

结合自定义γ角测量原理和增强型电网换相换流器(evolutional line commutated converter,ELCC)的工作状态,设计了ELCC的关断角测量方法和控制输出流程。在PSCAD/EMTDC中建立了具备关断角测量输出模块的新ELCC模型,并与CIGRE标准测试模型在暂态和稳态等不同条件下进行了仿真对比。结果表明,新ELCC模型与CIGRE标准测试模型在稳态工况下具备高度的等价性;在故障期间,新ELCC模型较CIGRE标准测试模型具备更强的交流侧单相故障抵御能力,有效地防止了换相失败的发生。验证了ELCC关断角测量输出模块的准确性,也为换流阀拓扑改造设计提供了参考。

Combined with the custom gamma angle measurement principle and the working state of the evolutional line commutated converter(ELCC),the ELCC's extinction angle measurement method and control output flow are designed.A new ELCC model with a extinction angle measurement output module is established in PSCAD/EMTDC,and compared with the CIGRE standard test model under different conditions of transient stability.The results show that the new ELCC model and the CIGRE standard test model have high equivalence under steady-state conditions;during the fault period,the new ELCC model has stronger AC single-phase fault resilience than the CIGRE standard test model,effectively preventing the occurrence of commutation failure.The accuracy of the ELCC turn-off angle measurement output module is verified,which also provides a reference for the renovation design of the converter valve topology.