双馈风电并网系统电压稳定性研究与改进

Wenzhao Duan, Zhiqiang Gao, Xuesong Zhou, Xiu-hua Zhang
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引用次数: 0

摘要

为了研究双馈风力发电系统中参数变化影响系统电压稳定性的分岔机理,基于3节点简单电力系统,以无功功率为分岔控制参数,采用局部延拓法追求系统平衡解的通用性。通过平衡解的流行曲线可以知道分岔点的位置和类型。在此基础上,结合时域图、相图和雅可比矩阵特征值轨迹图分析了系统从稳定到不稳定的动态过程,揭示了分岔参数变化引起的解的结构变化和电压稳定的本质原因,并分析了不同类型的分岔点作为初始工作点和不同扰动对系统电压崩溃的影响。最后,通过加入冲洗滤波器对系统进行了分析。结果表明,系统中存在鞍节点分岔、Hopf分岔和同斜分岔,这些分岔点会导致系统电压崩溃,加入冲淡滤波器可以消除分岔点,提高系统的电压稳定裕度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Research and improvement of voltage stability of grid connected system with doubly fed wind turbine
In order to study the bifurcation mechanism of parameter changes affecting the voltage stability of the system in the doubly fed wind turbine system, based on the 3-node simple power system, taking the reactive power as the bifurcation control parameter, the local continuation method is used to pursue the popularity of the equilibrium solution of the system. The location and type of bifurcation point can be known through the popularity curve of the equilibrium solution. On this basis, combined with the time domain diagram The phase diagram and Jacobian matrix eigenvalue trajectory diagram analyze the dynamic process of the system from stability to instability, reveal the structural change of the solution and the essential reason of voltage stability caused by the change of bifurcation parameters, and analyze the influence of different types of bifurcation points as the initial operating points and different disturbances on the voltage collapse of the system, Finally, the system is analyzed by adding washout filter. The results show that there are saddle node bifurcation, Hopf bifurcation and homoclinic bifurcation in the system, which can lead to the collapse of system voltage, and the addition of washout filter can eliminate the bifurcation point and improve the voltage stability margin of the system.
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