阻抗不均导致振荡中心迁移的规律

发布时间：2018-06-13 14:07

本文选题：振荡中心 + 动态迁移　；参考：《电网技术》2014年01期

【摘要】：基于计及阻抗不均的等值两机系统模型,采用向量图和数值计算相结合方法研究了线路阻抗不均导致振荡中心偏移的规律。定义两机系统总阻抗模值的中点为系统中心。在系统功角由0?360?摆周期中,系统阻抗角不等可导致振荡中心动态迁移:当系统中心落在联络线上时,振荡中心仅在联络线内部动态迁移。当系统中心落在联络线任侧系统等值阻抗上时,存在两种迁移规律,是仅在联络上动态迁移,二是振荡中心在联络线和系统中心所在的联络线侧等值阻抗上动态迁移。系统失步中心位置(振荡周期内电压过零点)不受阻抗不均的影响,不影响失步中心位置的定位,但失步中心并非只在系统功角摆至180?时出现。
[Abstract]:Based on the equivalent two-machine system model with unequal impedance, the law of oscillation center offset caused by line impedance imbalance is studied by using vector diagram and numerical calculation. The midpoint of the total impedance modulus of the two-machine system is defined as the center of the system. At the power angle of the system from 0 to 360? During the pendulum period, the dynamic migration of the oscillation center can be caused by the difference of impedance angle: when the center of the system falls on the tie-line, the oscillation center moves only within the tie-line. When the system center falls on the equivalent impedance of the tie-line system, there are two kinds of migration laws, that is, the dynamic migration of the oscillation center is only in connection, and the other is the dynamic migration of the oscillation center on the equivalent impedance of the tie-line and the tie-line side in which the system center is located. The position of the out-of-step center (voltage crossing point in the oscillation cycle) is not affected by the uneven impedance, and does not affect the location of the out-of-step center, but the out-of-step center is not only placed at the power angle of the system to 180? Appear when.
【作者单位】：南京南瑞集团公司(国网电力科学研究院);
【基金】：国家电网公司重大专项资助项目(S G C C-MPLG003-031-2012)~~
【分类号】：TM712

【参考文献】