中文摘要：

针对大型汽轮发电机接入串补输电系统面临的次同步谐振问题，研制出一种基于电力电子变流器的机端次同步阻尼控制器（generator terminal subsynchronous damping controller，GTSDC）。它由多模态次同步阻尼控制器和基于链式结构的高压大容量电流跟踪变流器构成，通过向机组定子侧注入幅值和相位可控的扭振模态互补频率的电流，实现抑制轴系扭振的目标。阐述GTSDC的工作原理和设计方法，研发一套等效容量为10 MVA、输出电压为22 kV的装置，并在上都电厂660 MW 机组上进行现场参数整定和效果试验，结果表明：所研发的GTSDC能大幅提高扭振模态阻尼并有效抑制持续激励引发的强迫性轴系扭振，为解决次同步谐振和振荡问题提供了一种新颖而有效的技术手段。

英文摘要：

A novel generator terminal subsynchronous damping controller （GTSDC） based on power electronic converter was proposed and developed to mitigate subsynchronous resonance （SSR）, a serious problem confronted by larger turbine-generators connected to series-compensated power systems. The proposed GTSDC is composed of a multimodal subsynchronous damping controller and a high-power current-tracking inverter. It can depress the torsional vibration by injecting controllable currents at complementary frequencies to torsional modes into the stator of the target generator. Its working principle and designing approach were elaborated in the paper. A practical equipment with a rating of 10 MVA/22 kV had been manufactured and then tested on a 660 MW turbine-generator at Shangdu Power Plant. Test results verified that GTSDC can improve modal damping considerably and suppress sustained torsional oscillation effectively. It provides a new countermeasure to inhibit subsynchronous resonance and oscillation.