风电系统多参数霍普夫分岔分析

Multi-Parameter Hopf Bifurcation Analysis of Wind Power System

应用多参数霍普夫(Hopf)分岔分析方法研究含异步发电机的风电系统电压稳定性。全面考虑了风电场的有功功率、无功功率和静止无功补偿器对电压稳定性的影响,进行了风电系统双参数Hopf分岔研究,求得有功功率和无功功率的两参数Hopf分岔边界,以及静止无功补偿器参数(参考电压和放大倍数)和有功功率的Hopf分岔边界。结果表明,风电场吸收的无功功率限制了有功功率的注入能力,较大的参考电压和放大倍数有助于提高风电场有功出力,避免了电压振荡失稳,而参考电压和放大倍数具有一定的互补性,其共同作用有利于延迟Hopf分岔,提高风电系统的电压稳定性。

The multi-parameter Hopf bifurcation analysis is utilized to research voltage stability of wind power system composed of induction generators.The impacts of active power and reactive power in wind power system and static var compensator（SVC） configured in wind farm on voltage stability are overall considered,and the two-parameter Hopf bifurcation analysis of wind power system is performed to obtain the two-parameter Hopf bifurcation boundary of active power and reactive power as well as the Hopf bifurcation boundary of active power and SVC parameters,namely its voltage reference and amplification factor.Results of this research show that the reactive power absorbed by wind farm restricts the injecting ability of active power;higher voltage reference and amplification factor of SVC contribute to increase active power output of wind farm,and then the instability due to voltage oscillation can be avoided;there is a certain complementarity between voltage reference and amplification factor,and their combined action contribute to delay Hopf bifurcation and improve voltage stability of wind power system.