HVDC附加次同步阻尼控制器设计及其相位补偿分析

Phase Correction Method of HVDC Supplementary Subsynchronous Multiple Models Damping Controller

附加次同步阻尼控制器(supplementary subsynchronous damping controller,SSDC)是解决由直流输电引起次同步振荡的一种有效措施。通过建立交直流系统发电机转速到电气转矩环节解耦传递函数结构分析了附加次同步阻尼控制器抑制次同步振荡原理,提出一种新型窄带通多通道SSDC结构及其相位校正计算方法,并设计开发了一套基于MATLAB图形用户界面(graphical user interfaces,GUI)的高压直流输电SSDC参数整定与分析软件。呼辽直流输电工程引起伊敏电厂三期两台汽轮发电机组次同步振荡的EMTDC/PSCAD实例仿真验证了所提出新结构与方法的可行性和有效性。

The HVDC transmission system may lead to subsynchronous oscillation under certain circumstances. By analyzing the decoupling transfer function structure of generator of the AC-DC system from rotation rate to the electric torque, we proposed a novel phase correction method of HVDC supplementary subsynchronous multiple models damping controller, and designed the SSDC software for adjusting and analyzing the parameters with matlab. Simu- link of the network connections of Hulunbier-Liaoning HVDC system in the Northeast power grid which can arouse the SSO proves that the method is feasible and effective.