多HVDC输电系统SSO抑制措施的协调控制研究

近年来,HVDC输电系统引起的次同步振荡（SSO）现象引起了众多专家学者的重视,附加次同步阻尼控制器（SSDC）是目前较为普遍的抑制措施.故以贵州电网多HVDC交直流混合输电系统为背景,对SSDC的协调控制问题进行了较为深入的探索.理论分析和大量仿真验证表明,SSDC和附加次同步励磁控制器（SEDC）提供的电气阻尼是解耦的,可以分别进行整定.而对配置在不同直流线路换流站处的多台SSDC进行整定时,协调控制是十分必要的.同时,随着通信技术的不断发展,取发电机组转速作为SSDC的输入信号会达到更理想的抑制效果.

The Coordination Control for SSO Restrain in Multi-HVDC Transmission System

More attentions have been paid to subsynchronous oscillation （SSO） caused by HVDC transmission system in these years. Subsynchronous damping contraller （SSDC） is the main restrain scheme utilized widely. The coordination control of SSDC was investigated, in the background of the alternative-direct transmission power system of Guizhou province. Three conclusions were verified by both theoretical analysis and numerical simulations. Firstly, the SSDC and subsynchronous excitation damping controller（SEDC） are deconpled and can be set respectively in the SSO restrain. Secondly, the coordination control of SSDC in different converter stations are necessary. At the same time, the generator speed can be applied as the input signal for an effective restrain with the rapid development of communication technology.