多频振荡下的失步振荡中心变化规律及其定位

发布时间：2018-05-16 06:29

本文选题：振荡中心 + 动态迁移　；参考：《电力系统自动化》2014年20期

【摘要】：基于三机等值系统,研究了多频振荡下失步振荡中心的特性及其变化规律。在同一失稳模式下,机组不同调导致振荡中心向不同调侧偏移,不同调越明显,偏移量越大。多频失步振荡过程中,同一个时刻仅有一个断面由于机组振荡导致电压为零,为系统失步振荡中心。失步振荡中心出现时,所在线路两侧等值两机系统功角摆开180°。系统阻抗参数决定了系统振荡中心最大迁移范围,在确定阻抗参数情况下,三机系统功角变化趋势决定了振荡中心迁移方向。传统基于就地信息的解列判据难以适应多频振荡下的失步场景,通过线路两侧相位差摆开180°的判据,可准确定位多频振荡下失步振荡中心出现时刻及其位置。
[Abstract]:Based on the three-machine equivalent system, the characteristics and variation of out-of-step oscillation center under multi-frequency oscillation are studied. Under the same unstable mode, the oscillation center is shifted to different side adjustment due to different adjustment, and the more obvious the different modulation is, the bigger the migration is. In the process of multi-frequency out-of-step oscillation, only one section at the same time is the center of out-of-step oscillation because the voltage is zero due to unit oscillation. When the center of out-of-step oscillation appears, the power angle of the equivalent two-machine system on both sides of the line is tilted 180 掳. The maximum migration range of the oscillation center is determined by the system impedance parameters. When the impedance parameter is determined, the direction of the oscillation center migration is determined by the variation trend of the power angle of the three-machine system. The traditional decoupling criterion based on local information is difficult to adapt to the out-of-step scene under multi-frequency oscillation. By tilting 180 掳of phase difference on both sides of the line, the time and position of the center of out-of-step oscillation under multi-frequency oscillation can be accurately located.
【作者单位】：国电南瑞科技股份有限公司;南京理工大学自动化学院;武汉大学电气工程学院;
【基金】：国家电网公司大电网重大专项资助项目(SGCC-MPLG003-2012)~~
【分类号】：TM712

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