一种基于储能的次/超同步振荡抑制方法研究

Research on a Method for Suppressing Sub/Super-Synchronous Oscillation Based on Energy Storage

双馈异步风力发电机(Doubly-Fed Induction Generator,DFIG)也称双馈感应发电机,其凭借变速恒频的优点在风电场中得到了广泛应用。随着大量风电能源并网,远距离高压输电使用串补电容技术容易引起电网发生次同步振荡(Subsynchronous Oscillation,SSO)。DFIG的定子绕组直连电网,因此在运行过程中极易受到电网SSO的影响。针对DFIG的SSO及抑制策略进行研究。提出了一种采用储能装置附加阻尼控制环节的方式来重塑风电场阻抗并抑制次/超同步振荡。通过电磁暂态仿真验证了该方案的性能,能成功地抑制不同频率的次同步电流,以提高目标系统的稳定性。

A doubly-fed induction generator(DFIG),also known as a doubly-fed wind generator,has been widely used in wind farms due to its advantages of variable speed and constant frequency.With the integration of a large amount of wind energy,the use of series compensation capacitor technology for long-distance high-voltage trans-mission is prone to causing subsynchronous oscillation(SSO)in the grid.The stator winding of the DFIG is directly connected to the grid,so it is highly susceptible to the influence of the SSO of the grid during operation.This paper studies the SSO of the DFIG and its suppression strategies,and proposes a method of using energy storage devices added by the damping control link to reshape the impedance of wind farms and suppress sub/super-synchronous os-cillation.The performance of this scheme has been verified through electromagnetic transient simulation,which can successfully suppress the sub-synchronous currents of different frequencies,so as to improve the stability of the tar-get system.