中文摘要：

由高压直流输电引起的次同步振荡各种因素中以整流器控制的影响最为显著，因此对整流器采用合适的控制方式和控制参数尤其重要，为从本质上分析高压直流输电整流器控制的阻尼特性，依据高压直流输电的准稳态模型，考虑锁相环等快速响应环节的影响，在频域上实现复数力矩系数法分析不适当的整流器控制产生次同步振荡的原理，运用扫频法绘制发电机在不同频率下的电气阻尼特性曲线。通过比较整流器3种控制策略的阻尼特性，表明非线性定电流控制具有较好的正阻尼特性；同时，相位校正环节的引入对线性控制策略的阻尼特性也有较大改善。此外，探讨了发电机与换流变压器之间的戴维南等值阻抗对阻尼特性的影响。

英文摘要：

Improper rectifier control mode is the dominant influencing factor among various factors related to HVDC power transmission, which lead to subsynchronous oscillation （SSO）. So it is important to apply the appropriate control strategy and control parameters to rectifiers. Based on the quasi-steady-state model of HVDC system, with the effect of phase-locked loop considered, the mechanism of subsynchronous oscillation caused by improper rectifier control by analyzing with complex-torque-coefficient in frequency domain is presented. A series of damping coefficient curves for generators under different frequency are presented by using the frequency-scanning method. By comparisons among three control strategies for rectifiers, it is shown that nonlinear constant-current control has the best positive damping characteristic, and phase correction can improve the damping characteristic of the linear controller to some extent. Lastly, the effect of Thevenin impedance between generator and converter transformer on damping characteristic is also discussed.