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中文摘要：
针对多馈入直流系统中发生的后续换相失败问题,以换相失败的本质为理论依据,在搭建仿真模型的基础上验证了静止无功补偿器（SVC）在抑制后续换相失败中的作用,同时提出一种有效抑制后续换相失败的变熄弧角控制方式.通过分析变熄弧角控制方式的应用缺陷,进一步提出一种基于渐变恢复理论的新型动态低压限流环节（VDCOL）控制方式.该控制通过动态VDCOL延缓单条直流功率恢复速率,可降低故障期间直流系统对交流系统的无功需求,同时其延时环节也可消除暂态过程中各条直流线路间的不良交互影响,以达到多条直流交替恢复、有效抑制后续换相失败的目的.仿真算例结果验证了控制方法的有效性.
英文摘要：
Aiming at the follow-up commutation failures in multi-infeed HVDC system,a typical multi-infeed HVDC model is established to specify the effect of SVC on the inhibition of follow-up commutation failures and a method based on the essence of commutation failures is put forward to control the variable arc extinction angle.The defect of the variable arc extinction angle control method in application is analyzed and a dynamic VDCOL control model based on the staggered recovery strategy is further proposed,which uses the dynamic VDCOL to delay the power recovery rate of single line for reducing the reactive power demand of DC system during faults and eliminating the adverse interaction between different DC lines.The DC lines are thus recovered in a staggered way to effectively inhibit the follow-up commutation failures.The simulative results show its effectiveness.
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