换流器单元产生的谐波会流过交流和直流线路。
The converter units generate harmonics which flow in the AC and DC lines.
然而，目前对直流线路故障暂态特性仍缺乏系统、深入的理论研究。
But there are few theories and methods for the analysis of the transient characteristics of DC line fault.
直流侧纹波消除电路是基于直流线路中纹波的直接再注入原理而设计。
The circuits of dc-side ripple reduction are based on direct reinjection of the ripple in series with the dc line.
提出了一种新的保留故障直流线路处的电容器组的策略，以提高故障下的暂态稳定性。
A novel new strategy is proposed, in which the filter of the DC fault line at converter station is reserved to enhance the system transient voltage stability under this fault.
针对双桥十二脉动直流系统，推导了直流线路发生短路故障时的整流器过冲电流公式。
The formula of the rectifier's overshoot current of bidirectional 12-pluse DC system when DC line short-circuit fault occurs is derived.
仿真结果表明，非线性变结构控制可以有效地调节直流线路的传输功率，保证交直流系统的稳定性。
The result indicates the nonlinear variable structure control can adjust the transmission power of DC line effectively, and assure the stability of the AC-DC system.
本文研究了如何由直流线路的几何参数计算其模参数的方法，对时域故障测距原理进行了仿真验证。
On the basis of researching of the way of calculating mode parameters of transmission line form its geometric parameters, the feasibility of time domain fault location method is validated.
表中单芯铠装电缆仅适用于直流线路，如用于交流则必需采用非磁性材料或减少磁损耗结构的铠装。
The single core armored cable in the list are only suitable for use for DC circuit. If used for AC circuit, non-magnetic material or armored by reducing magnetic loss structure must be used.
另一方面，线路故障后直流线路保护的暂态响应特性与控制系统强相关，而对直流系统这种特有复杂性对线路保护影响的研究较少。
On the other hand, the transient characteristics of the HVDC line fault and thus the line protections are affected by the HVDC control system, which is very complicated and still a hard nut to crush.
另一方面，线路故障后直流线路保护的暂态响应特性与控制系统强相关，而对直流系统这种特有复杂性对线路保护影响的研究较少。
On the other hand, the transient characteristics of the HVDC line fault and thus the line protections are affected by the HVDC control system, which is very complicated and still a hard nut to crush.
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