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长距离大功率输电系统，在暂态时阻尼特性较差是其稳定性的主要特点。本文从理论上论证了静止无功补偿器（SVC）能够提高系统阻尼特性的原理，证明了SVC采用频率作为控制信号时具有最佳的阻尼效果，给出了SVC模型。实际500kV长距离输电系统仿真计算所得的结果验证了SVC提高系统阻尼特性的效果。
Long-distance high-power transmission system, the damping characteristics of the poor transient is the main feature of its stability. In this paper, the principle that static var compensator (SVC) can improve the damping characteristics of the system is demonstrated theoretically. It is proved that SVC has the best damping effect when the frequency is used as the control signal, and the SVC model is given. The simulation results of the actual 500kV long-distance transmission system verify the effectiveness of SVC in improving the damping characteristics of the system.