基于双馈风机的次同步阻尼控制器设计

Design of Subsynchronous Damping Controller Based on Doubly Fed Introduction Generator

针对双馈风机串补并网系统的次同步振荡现象以及现有的次同步振荡抑制措施由于缺乏对振荡机理的研究而物理意义不明确等问题,在PSCAD/EMTDC软件中搭建双馈风机串补并网系统的模型,分析次同步振荡的机理,并基于次同步振荡的机理分别在转子侧和定子侧设计一种新的附加阻尼控制器,通过带通滤波、带阻滤波以及移相环节,以达到抑制次同步振荡的效果。仿真结果表明:两种附加阻尼控制器在不同的运行工况下都能使系统快速稳定,并且转子侧附加阻尼控制器的性能略优于网侧的附加阻尼控制器。

In order to solve the problem that the subsynchronous oscillation and the existing subsynchronous oscillation suppression measures for doubly fed induction generator（DFIG）series compensation system are not clear in physical meaning due to the lack of research on the mechanism of oscillation, this paper set up a model of such system in PSCAD/EMTDC and analyzed the mechanism of subsynchronous oscillation, based on which a new additional damping controller, including bandpass flter, band stop flter and phase shift links, was designed at the rotor side and the stator side respectively, so as to suppress subsynchronous oscillation.The simulation results show that the two additional damping controllers can make the system fast and stable under different operating conditions,and the performance of the additional damping controller at the rotor side is slightly better than the additional damping controller at the grid side.