采用特征值分析法研究交直流电力系统中HVDC换流器控制对次同步振荡（SSO）模态阻尼的影响。
The influence of HVDC converter controls on the mode damping of sub-synchronous oscillations (SSO) in a AC/DC power system is investigated in this paper by using eigenvalue analytical method.
实际分析表明，逆变侧交流母线的强弱以及逆变站不同的控制方式对次同步振荡阻尼特性有显著影响。
The results of practical analysis show that the strength of AC busbar at inverter side and various control modes of inverter station impact the characteristics of SSO evidently.
其结论对系统中低频振荡和次同步振荡的抑制提供了理论依据，对系统的安全稳定运行有参考价值。
The conclusion provides academic bases to restrain LFO and SSO and is significant to the security and stability of power system.
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