HVDC及其控制系统动态稳定性的理论分析

不恰当的HVDC控制系统会导致AC-DC系统动态失稳，引发交流系统次同步振荡，严重时可导致发电机轴系永久性损坏。文中利用复数力矩分析方法推导了HVDC系统的电磁力矩公式，用以定量地确定不同控制回路和控制方式下HVDC系统的动态稳定性，为进一步设计和改进HVDC的控制系统提供了理论依据。

ANALYSIS OF THE DYNAMIC STABILITY OF HVDC AND ITS CONTROL SYSTEM

The control manner of HVDC system often plays an important role in the dynamic stability of an AC DC power system. The improper controller often causes subsynchronous resonance (SSR) of the generation unit and damages its shafting system. The paper introduces a theoretic expression of the electromagnetic torque using the complex torque analysis method. On the basis of this expression the electromagnetic torque, the dynamic stability of HVDC system under different control loop and control manners can be easily identified in quantity. Meanwhile, the proposed method also offers a theoretic principle to help improve the performance of the controller of HVDC system.