不同控制策略下混合多端直流输电的交流故障响应对比

摘要

As a new solution of HVDC, hybrid multi-terminal HVDC combines the merits of LCC-HVDC and VSC-HVDC.Firstly, an electromagnetic transient model is constructed for a parallel hybrid three-terminal HVDC transmisstion project using PSCAD/EMT-DC program.Secondly, two different strategies defined as the inverter voltage control and rectifier voltage control are proposed for the hybrid multi-terminal HVDC and change of the system operation point is researched in detail.At last, the effectiveness of the strategies is verified in the simulation of the constructed model, and the AC fault responses under different strategies are comparatively analyzed.%混合多端直流输电综合利用常规直流和柔性直流输电的优点,是一种新型直流输电解决方案.基于PSCAD/EMTDC平台建立了并联型混合三端直流系统详细的电磁暂态模型,实现了混合三端直流输电.然后提出了两种混合多端直流控制策略,分别是逆变站定电压和整流站定电压,研究了两种控制策略下系统运行点的变化.最后基于混合三端直流系统模型仿真验证了两种策略的有效性,对比分析了多端直流输电系统的交流故障响应特性.