摘要
大规模风电通过串补交流输电模式并入电网可以提高输电能力,但同时可能带来次同步振荡问题,引起风机脱网或设备损坏。风电并网引发次同步振荡的产生机理主要有感应发电机效应、次同步控制相互作用和次同步轴系扭振作用,其中次同步控制相互作用是风电并网特有的现象,机理尚不明确,需要深入研究;对风电次同步振荡问题的研究可以通过频率扫描分析法、小信号分析法和电磁暂态分析法,三种方法均基于系统控制微分方程的时域模型,三种方法的相互配合可以提高运行速度,得到更精确的结果。由于对风电机组的次同步振荡研究较少及风电并网的复杂性,对此课题的研究有极大的挑战性与创新性。
The transmission capacity of the grid can be improved when scale wind power connects to the grid through a series compensated AC transmission mode. But it may lead to sub-synchronous oscillation problems and cause the generator off the grid or the damage of facilities. SSR generation mechanism involves induction generator effect,subsynchronous control interaction and sub-synchronous torque interaction where sub-synchronous control interaction is unique for wind power connecting to grid and the mechanism is still not clear,which requires in-depth study. Study of sub-synchronous oscillation can be developed by frequency scanning analysis,small signal analysis and electromagnetic transient analysis. The basis for the three methods is the time domain model of system based on governing differential equations. The coordination of the three tool is more effective and more accurate. Because of the lack of study on the wind turbine sub-synchronous oscillations and the complexity of wind power system,study on this subject faces a great challenge and would be innovative.
出处
《华北电力技术》
CAS
2014年第6期10-15,共6页
North China Electric Power
关键词
风电
串补
次同步振荡
机理
分析方法
wind power
series compensation sub-synchronous oscillation
generation mechanism
analysis method
mitigation method
