导致振荡中心迁移的基本因素及其敏感性分析

发布时间：2018-07-10 13:03

  本文选题：振荡中心 + 动态迁移　； 参考：《中国电机工程学报》2017年06期

【摘要】：研究发现了振荡中心处电压和电流瞬时频率之和等于两侧等值电势频率之和的规律。提出导致振荡中心迁移的3个基本因素:主导振荡模式更迭、等值电势不等和系统阻抗比例变化。理论证明了失步断面线路开断或串补旁路导致的失步断面等值阻抗增大,不会导致振荡中心迁移出失步断面。基于"两华"电网不同失稳模式的等值阻抗特性,分析了不同扰动导致振荡中心迁移的途径及其敏感性。由于切机等措施引起的振荡中心某一侧等值电势阻抗变大,将导致振荡中心向该侧迁移,存在迁移出初始失步断面的风险。振荡中心一侧的机组不同调可引起等值电势比大幅变化,导致振荡中心迁移初始出失步断面,如不快速采取控制措施,可演化为多群振荡,出现主导失稳模式更迭,进而导致振荡中心大范围迁移,对系统影响较大,需重点防控。
[Abstract]:It is found that the sum of instantaneous frequency of voltage and current at the center of oscillation is equal to the sum of equivalent potential frequency of both sides. Three basic factors leading to the migration of the oscillation center are proposed: the change of dominant oscillation mode, the unequal equivalent potential and the change of impedance ratio of the system. It is proved theoretically that the equivalent impedance of out-of-step section caused by breakage of out-of-step section line or series compensation bypass will not cause the oscillation center to migrate out of the out-of-step section. Based on the equivalent impedance characteristics of different instability modes in the "two Hua" power grid, the paths and sensitivities of the oscillation center migration caused by different disturbances are analyzed. Because the equivalent potential impedance of one side of the oscillation center increases due to the cutting machine and other measures, the oscillation center will migrate to that side, and there is the risk of migration out of the initial out-of-step section. Different adjustments of units on one side of the oscillation center can cause significant changes in the equivalent EMR, leading to the initial out-of-step section of the oscillation center migration. If the control measures are not taken quickly, it can evolve into multi-group oscillations and lead to the change of instability modes. Therefore, the oscillation center is shifted in a wide range, which has a great influence on the system and needs to be prevented and controlled.
【作者单位】： 华北电力大学电气与电子工程学院;智能电网保护和运行控制国家重点实验室(南瑞集团公司);国电南瑞科技股份有限公司;
【基金】：国家重点研发计划(2016YFB0900602)~~
【分类号】：TM712
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本文编号：2113475