基于DEH系统改造的600MW机组甩负荷试验分析

Load Rejection Test for 600 MW Unit with the Improvement of DEH System

摘要: 本文开展了DEH系统改造后的600 WM机组甩负荷试验，计算了改造后机组的各项动态特性参数，确定了其良好的动态调节特性；结合改造前后数据的对比发现，改造后机组的转子飞升时间常数变小，在甩负荷后可能出现动态超速难易控制的情况，蒸汽容积时间常数也变小，这可能与汽门严密性试验不合格有关。进而提出了相关甩负荷试验进行时需注意的几个问题。

Abstract: Load rejection test for 600 MW unit with the improvement of DEH system was made. Based on the calculation of various parameters, the good dynamic regulation characteristic was identified. After the comparison of data before and after system transformation, the constant Ta decreased, which leaded to a difficult control of over speed problem after load rejection test probably. And the constant Tv was also decreased obviously due to the failed valve tightness. Finally, several important problems were proposed, which should be paid more attentions when the load rejection test was carried out.