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中文摘要：
直流附加控制是HVDC系统抑制低频振荡的有效措施．但是在多直流HVDC系统中不同的直流点加装附加控制所取得的效果和花费的代价不同。提出以达到相同阻尼效果时所需直流调制输出量最小（或单位调制量下阻尼最大）为目标来选择加装附加控制的直流点。基于线性系统理论推导了控制敏感因子指标。计算各发电机对某振荡模式的参与因子．取参与因子较大的机组的功角和惯性时间常数进行处理得到综合功角。通过矩阵束辨识方法确定某直流线路对综合功角主振模式的控制敏感因子．对得到的多直流系统中不同直流的控制敏感因子排序形成最优控制策略表。控制敏感因子愈高的直流线路愈宜作为附加直流控制的安装点。最后对某多直流HVDC系统进行仿真验证．结果表明了所得最优控制策略表的准确性。
英文摘要：
Additional damping control is an effective measure to suppress the low-frequency oscillation of HVDC system,but its effect and cost depend on the installation point in multi-HVDC system. For a certain damping effect,it is proposed to take the minimum DC output modulation as the objective for the installation point selection. An index named controllability sensitivity factor is deduced based on the linear system theory. The participation factor of each generator in a certain oscillation mode is calculated and the inertia time constants and power angles of the generators with bigger participation factors are processed to obtain the comprehensive power angle. Matrix-pencil identification is applied to determine the controllability sensitivity factor of each DC line to the main oscillation mode of the comprehensive power angle. An optimal control strategy is formed by sorting the controllability sensitivity factors of different DC lines. The DC line with the biggest controllability sensitivity factor is the most effective point for additional damping control. The simulative result for a multi-HVDC control strategy. system illustrates the correctness of the obtained optimal
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