直驱式风电机组机电暂态建模及仿真  

Electromechanical Transient Modeling and Simulation of Direct-Drive Wind Turbine System With Permanent Magnet Synchronous Generator

作　　者：高峰[1] 周孝信[1] 朱宁辉[1] 苏峰[1] 安宁[1] 

机构地区：[1]中国电力科学研究院,北京市海淀区100192

出　　处：《电网技术》2011年第11期29-34,共6页Power System Technology

摘　　要：基于矢量解耦控制策略,建立了适用于电力系统暂态稳定分析的直驱式风力发电机组机电暂态模型。为模型做了2点合理假设:有功功率和无功功率在暂态过程中完全解耦;测量的电气量准确,和实际的电气量完全相等。基于这些条件,从实际的物理装置出发,对直驱式风电机组的电磁暂态模型进行简化。考虑了变频器直流电压的动态过程和低电压穿越的运行特性。仿真结果表明,该模型和电磁暂态模型动态响应曲线一致,结果准确、可靠,可以用于分析大规模直驱式风电场接入对电力系统安全稳定性的影响。Based on vector decoupling control strategy, an electromechanical transient model of direct drive permanent magnet synchronous generator （PMSG） system, in which the structure of twin back-to-back converters is utilized and the most common space vector decoupling control scheme is adopted, is built. The built model is suitable for power system transient stability analysis. Two reasonable hypotheses for the built model are made： active power and reactive power are fully decoupled during the transient process and the measured electrical quantities are accurate and fully equal to actual ones. According to the hypotheses and based on real physical facility, the electromechanical transient model of direct drive PMSG is simplified, meanwhile dynamic process of PWM converter＇s DC voltage and the operating characteristic of low voltage ride through are taken into account. Simulation results show that dynamic response of the built model is basically consistent with that of electromagnetic transient model, thus owing to the reasonability and accuracy of the built model it can be used to analyze the impact of grid-connected large-scale direct drive permanent magnet synchronous generator （PMSG） system on security and stability of power grid.

关 键 词：直驱式风电系统 机电暂态模型 低电压穿越 电力系统分析 

分 类 号：TM74[电气工程—电力系统及自动化]