The current research on the steady - state operation of grid - connected wind farms is introduced , including the power flow calculation models for power systems which contain wind farms , the analytic methods and models for the static voltage stability of wind farms , the voltage static stability indices and measures to control the voltage stability , the factors influencing the maximum power injection of wind farms and main relevant analytic methods , indices for wind farm scale , and the capacity credit 摘要介绍了风力发电并网的稳态运行的研究现状，包括含风电场的电力系统潮流计算及模型，风电场的静态电压稳定性的分析方法与模型，电压静态稳定性指标和控制电压失稳措施，风力发电最大注入功率的影响因素及主要分析方法，衡量发电规模的指标及容量可信度等。
The subject of voltage stability has become a hot research subject and an urgent question in electric power system . it includes exploring the mechanisms of voltage collapse , constructing a model that reflects real electric power system as possibly as it can and strengthening the researches of power system voltage stability and security 电压稳定性课题已成为热门的研究课题和电力系统迫切需要解决的问题，包括探索电压崩溃的机理、建立尽可能反映电力系统实际的数学模型，以及加强电力系统电压稳定性和安全性的研究。
The impact of load characteristics and on load tap changer on static voltage stability is analyzed with the methods based on v - q and v - p curves , and the phenomenon of voltage stability voltage instability and voltage collapse are studied with steady - state simulation . finally the thesis presents the essential explanations of both voltage stability and the mechanism of voltage collapse . xu yonghua ( electrical engineering ) directed by prof 通过电压?功率曲线分析法定性分析了不同负荷特性和有载调压变压器对静态电压稳定性的影响，并通过静态仿真法从物理现象上研究了电压失稳和电压崩溃现象，最后针对这些现象给出了关于电压稳定、以及电压崩溃的本质解释。
The calculation of ttc involves network limitations due to thermal and voltage stability limits . network limitations are to be calculation not only for the current operating but also for a worse case that could occur due to a set of contingency cases , which require huge amount of computation 本文以连续潮流技术为基础，提出了考虑各种约束条件的电力系统区域间最大输电能力的分析与计算，考虑了电力系统运行中鞍型分叉点造成的静态电压稳定性约束条件等的计算。
