Replacing conventional generation by power electronics based generation changes the dynamic characteristics of the power system. This results among others in the increased susceptibility to sub synchronous oscillations (SSO). This paper proposes a systematic procedure for mitigating the interactions between a DFIG and a series compensated transmission line using the phase imbalance compensation (PIC) concept. The impact of the series and parallel PIC on the resonance behaviour of the grid is first thoroughly investigated. Then, the influence of the system strength on the capabilities of the PIC to mitigate DFIG-SSR is assessed. Based on the findings a design framework which enables the systematic assessment of the series and parallel PIC for mitigating DFIG-SSR is developed and successfully implemented in the modified IEEE 39 bus system. Comparison between both concepts reveals that the parallel PIC is better suited to mitigate DFIG-SSR. The impedance based stability analysis and detailed time domain electromagnetic transient (EMT) simulations are used to respectively screen and validate the results.

中文翻译：

---

使用相位不平衡补偿减轻 DFIG-SSR 的系统程序

用基于电力电子的发电代替传统发电改变了电力系统的动态特性。这尤其导致对次同步振荡 (SSO) 的敏感性增加。本文提出了一种使用相位不平衡补偿 (PIC) 概念来减轻 DFIG 和串联补偿传输线之间相互作用的系统程序。首先彻底研究了串联和并联 PIC 对电网谐振行为的影响。然后，评估系统强度对 PIC 减轻 DFIG-SSR 能力的影响。基于这些发现，开发了一个设计框架，该框架能够系统地评估串联和并联 PIC 以减轻 DFIG-SSR，并在修改后的 IEEE 39 总线系统中成功实施。两个概念之间的比较表明，并行 PIC 更适合缓解 DFIG-SSR。基于阻抗的稳定性分析和详细的时域电磁瞬态 (EMT) 仿真分别用于筛选和验证结果。