同期装置导前时间误差分析

Analysis of lead time error for synchronization device

介绍了几种发电机同期装置合闸预报算法的原理,分析了影响同期装置导前时间误差的主要因素,指出传统算法的一些重要缺陷。提出考虑滑差变化情况的合闸预报算法能更准确地表达相角的变化,但在微机型同期装置现有的测量精度下,考虑滑差加速度的模型因为微分的作用,放大了误差的影响。随着机组容量的增大,这种误差已经不能忽略。介绍了最小二乘估计算法在减少合闸预报算法误差方面的作用,它通过最小化误差的平方和寻找数据的最佳函数匹配,针对同期装置测量产生的随机误差,在滑差的计算中利用最小二乘估计算法可以最大限度地降低合闸预测角度的误差。

The closing prediction algorithm of some generator synchronization devices is introduced,the main factors causing the lead time error are analyzed and the important defects of traditional algorithms are pointed out. It is pointed out that, at present measurement accuracy of microprocessor-based synchronization device,though the closing prediction algorithm considering the frequency slip change has more accurate phase angle,because its model considers the frequency slip acceleration,it amplifies the impact of lead time error,which could not be ignored for large-capacity generator. The least square approximation algorithm is introduced to reduce the error of closing prediction algorithm,which seeks the best-matchlng function for the random measurement errors of synchronization device by minimizing the square error to reduce the prediction error of closing angle in the frequency slip calculation.