Abstract This paper presents the voltage stability assessment of power system with increasing wind energy penetration. The effects of increasing Doubly-Fed Induction Generator-based Wind Energy Conversion System (DFIG-WECS) penetration in the power system have been investigated in this work. Active Power-Voltage (PV) analysis was employed to determine the voltage stability limits in terms of the maximum loadability limit within which stable operation of the grid can be guaranteed as the wind energy penetration increases. The analyses in this work were carried out both for normal and contingency operations of the grid. IEEE 14-bus test system was used as the study case. Simulations were carried out using DigSilent PowerFactory software and results analyses were done using MATLAB. Furthermore, the effects of integrating DFIG-WECS on the loading of essential power system equipment are investigated. The results show that the maximum loadability limit of the study system increases with increasing DFIG-WECS power penetration up to 100%. However, the overloading effects on critical transmission lines presents a definitive limit to the allowable practical penetration level, which is determined to be 28.06%. This limit can be improved to 29.88%, 46.3% and 52.23% by Thyristor-Controlled Series Capacitor (TCSC) application on Line 9–14, upgrading Line 9–14 to double circuit, and upgrading both Line 9–14 and Line 13–14 to double circuit respectively. Thus, effective line enhancement and reactive power compensation strategy such as those offered by FACTS devices are required for a voltage-stable operation of the grid with increasing wind energy penetration.

中文翻译：

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风能渗透率不断提高的电网电压稳定性评估与提升

摘要 本文介绍了随着风能渗透率不断提高的电力系统电压稳定性评估。在这项工作中已经研究了增加基于双馈感应发电机的风能转换系统 (DFIG-WECS) 在电力系统中的渗透的影响。有功功率-电压 (PV) 分析用于根据最大负载能力极限确定电压稳定极限，在该极限内，随着风能渗透率的增加，可以保证电网的稳定运行。这项工作中的分析是针对电网的正常运行和应急运行进行的。IEEE 14 总线测试系统被用作研究案例。使用 DigSilent PowerFactory 软件进行仿真，并使用 MATLAB 进行结果分析。此外，研究了集成 DFIG-WECS 对基本电力系统设备负载的影响。结果表明，研究系统的最大负载能力极限随着 DFIG-WECS 功率渗透率的增加而增加，最高可达 100%。然而，对关键输电线路的过载影响对允许的实际渗透水平提出了明确的限制，确定为 28.06%。通过在 9-14 号线应用晶闸管控制串联电容器 (TCSC)，将 9-14 号线升级为双回路，并同时升级 9-14 号线和 13- 号线，该限制可以提高到 29.88%、46.3% 和 52.23% 14 分别为双回路。因此，