发电机准同期合闸相角差整定分析

Calculation and Analysis of Phase-angle Difference at the Moment of Generator Parallel Switching

为了提高发电机组并网品质,应对同期装置参数进行合理整定,结合电压差、频率差及合闸相角差对并网冲击电流的影响,利用发电机组并列试验实例,分析合闸相角差偏大是导致并网冲击电流偏大的主要原因。通过对试验数据的分析,确定影响合闸相角差的决定因素,并详细叙述同期装置的现场试验、数据分析及参数整定的方法。应用该分析方法对同期装置重新整定后,实际并网品质得到了大幅改善。

In order to improve the quality of generator parallel, synchronizing device parameters should be set ra-tionally. Combining the influence of voltage difference, frequency difference and phase-angle difference to the surge current, taking a generating parallel test for example, large phase-angle difference which is the main reason of large parallel surge current is analyzed. Through analyzing the test data, the determinant factor influencing phase differ-ence is determined and the methods of the synchronizing device field test, data analysis and parameters adjusting are described in detail. The actual quality of generator parallel has been greatly improved after resetting the syn- chronizing device.