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在电力系统的暂态过程中,水电厂失磁保护常将未失步的发电机组跳闸。这将使水电占较大比例且总容量不很大的电网在暂态过程丧失部分电源,造成事故扩大。使原来可能是暂态稳定的系统,最后导致暂态不稳定。本文通过对发电机失磁物理过程、发电机暂态过程功角特性及发电机失磁保护原理等方面的分析,说明导致暂态过程功角搂开且未失稳的发电机跳闸原因。
During the transient process of the power system, the loss of excitation protection of the hydropower plant often trips the unexpired genset. This will cause a large proportion of hydropower and the total capacity is not large in the power grid during the transient loss of part of the power, resulting in an increase in accidents. So that the original may be transiently stable system, leading to transient instability. In this paper, the causes of the generator trip caused by the hysteresis in the power angle and the instability of the transient process are explained by the analysis of the physical process of the generator loss, the power angle characteristic of the transient process of the generator and the principle of generator loss protection.