双馈风机接入对电力系统失步振荡中心迁移的影响

发布时间：2018-04-04 02:59

本文选题：双馈风力发电机　切入点：故障行为　出处：《电网技术》2017年08期

【摘要】：随着双馈风力发电机(doubly fed induction generator,DFIG)装机容量持续增加,电力系统失稳后双馈风机的故障行为将进一步影响系统失稳模式及解列断面的选址。针对风电对系统失步振荡的影响问题,推导了系统失步场景下DFIG定子磁链、转子电压与外特性表达式,指出DFIG外特性曲线近似满足椭圆方程。进一步推导了风机接入下振荡中心与失步振荡中心位移函数,理论分析表明振荡中心的迁移范围扩大至整条输电线路,失步中心分布范围增加、且向远离风电场方向迁移,据此阐述了DFIG不同故障穿越措施对失步振荡中心迁移的影响程度。最后将双馈风电场分别接入两机系统与IEEE 118节点系统,仿真验证了上述理论的正确性。
[Abstract]:As the installed capacity of doubly fed induction generator continues to increase, the fault behavior of doubly-fed wind turbine after power system instability will further affect the instability mode of the system and the location of the decoupling section.In view of the influence of wind power on the out-of-step oscillation of the system, the expressions of stator flux, rotor voltage and external characteristic of DFIG in the out-of-step scenario are derived. It is pointed out that the external characteristic curve of DFIG approximately satisfies the elliptic equation.Furthermore, the displacement function of oscillation center and out-of-step oscillation center under fan connection is derived. The theoretical analysis shows that the migration range of oscillation center is extended to the whole transmission line, the distribution range of out-of-step center increases, and moves away from wind farm.Based on this, the influence of different fault traversing measures of DFIG on the migration of out-of-step oscillation center is described.Finally, the doubly-fed wind farm is connected to the two-machine system and the IEEE 118-bus system respectively, and the simulation results verify the correctness of the above theory.
【作者单位】：武汉大学电气工程学院;国网物资有限公司;
【基金】：国家自然科学基金项目(51507116) 国家电网公司科技项目(XT71-16-032)~~
【分类号】：TM712

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