含大型风电场系统暂态电压稳定性分析  

Transient voltage stability analysis in the large-scale wind power integrated system

作　　者：卢锦玲[1] 石少通[1] 徐超[1] 程晓悦[1] 

机构地区：[1]华北电力大学电气与电子工程学院,保定071003

出　　处：《华北电力大学学报（自然科学版）》2014年第1期45-52,共8页Journal of North China Electric Power University：Natural Science Edition

摘　　要：目前,静态电压稳定和暂态功角稳定的机理研究和分析方法已取得很大进展,然而对暂态电压稳定性的研究不够充分,有关暂态电压崩溃的机理、模型和稳定指标的研究尚待深入。为了探讨大型风电场接入电网后在电网受到短时大扰动后的暂态电压稳定性以及故障期间如何保持风电场并网运行并对系统暂态电压稳定提供动态支持,基于双馈风机建立了风电机组的暂态数学模型,分析了含风电场地区电网暂态电压失稳的机理,建立了暂态电压稳定指标和风电机组的综合控制模型,对比分析了不同风电接入容量、不同故障位置以及不同阵风强度下系统节点的暂态电压稳定性。通过改进风电机组的控制模型建立了具有暂态电压支持能力的快速桨距角控制和转子侧变频器控制协调控制模型以改善电网故障期间风电场地区的暂态电压稳定性。最后,通过仿真分析了大型风电场接入电网后系统发生大扰动期间风电机组特性对电网暂态电压稳定性的影响,验证了改进的控制模型对提高风电场地区暂态电压稳定性的有效性。At present, the mechanism and evaluation of static voltage stability and transient power angle stability have made great progress, however, the transient voltage stability study has not been taken seriously. The mechanism, mod- el and index of transient voltage stability study should be investigated further. In order to probe the transient voltage sta- bility of grid with large wind farm integrated system after suffered big disturbances and how to keep the wind generator connected with the grid and provide dynamic reactive power to vohage recovery during fault time, this paper establishes the transient mathematic model of wind generator, and analyzes the mechanism of the loss of transient voltage stability of grid with wind farm. Then establishes the evaluation index of transient voltage stability and control model of wind farm, and analyzes the transient voltage stability under the situation of different wind power outputs, fault position and gust. This paper also establishes the coordinated model of fast pitch angle control and rotor side converter control with transient voltage support ability by modified the control model of wind generator. Finally, an example is analyzed the transient voltage stability of the grid with large-scale wind power integrated system during big disturbances, verifies the validity of modified control model to improve the transient voltage stability of such kind of power grid.

关 键 词：暂态电压稳定 电压崩溃机理 大扰动 电压稳定指标 控制模型 

分 类 号：TM712[电气工程—电力系统及自动化]