摘要
随着风电并网规模的增大,其对电力系统动态行为的影响也日益明显。在调节有载调压变压器(OLTC)的分接头时,由于其机械特性的变化,可能导致电压出现失稳,并对电力系统稳定性造成影响。论文基于分岔理论,研究OLTC调整过程中不同的调节档距以及时间常数对电力系统的影响。研究结果表明,在调整过程中OLTC大档距调整比小档距调整更容易发生Hopf分岔,从而引发电压动态失稳,导致系统崩溃;同时,OLTC自身的时间常数也是维持系统稳定的一个重要因素,OLTC时间常数越小,OLTC的调节速度会越快,也更有利于保持电力系统的稳定。
With the increasing scale of wind power grid,the impact on power system dynamic behavior is increasingly obvious.Due to the mechanical properties changing of on load tap changer（OLTC）during regulating,voltage instability appeared and the stability of power system was affected.The OLTC regulation of different span adjustment process and the influence of time constant of power system were studied based on the bifurcation theory.The OLTC large span adjustment was more likely to appear the Hopf bifurcation point than small span to lead the voltage dynamic instability,and the time constant of OLTC was an important factor to maintain system stability.OLTC regulated faster when the OLTC time constant became smaller,and made advantage to maintain the stability of power system.
出处
《中国农机化学报》
2016年第10期166-170,共5页
Journal of Chinese Agricultural Mechanization
基金
辽宁省自然科学基金项目(201202191)
