大型水轮发电机无功不足的原因分析与处理

Reason Analysis and Dispose for Deficiency of Reative Power in Hydrogenerators

本文以云南省华坪县与四川省攀枝花市的交界处观音岩电厂为例针对发电机额定励磁电流不能带额定无功功率的问题进行了相关研究。并对现场情况和机组无功不足可能产生的原因进行分析,通过仿真、计算、对比、验证,得出了"相同励磁电流的情况下,机端电压升高与定子漏抗增大都将导致机组的无功出力大幅下降"的结论,并为此类电厂的今后的运行和发展提出重要的建议。

In this paper, a case analysis of Guanyinyan power plant at the junction of Huaping County in Yunnan Province and Panzhihua City in Sichuan Province whose rated field current of the generator can not produce rated reactive power. In addition, the paper analyzes the scene condition and causes of reactive power shortage, through simulation, calculation, comparison and verification, to obtain the conclusion that ＂Under the same excitation current,increase of terminal voltage and the stator leakage reactance will cause unit reactive power output fell sharply.＂ Finally, some suggestions are put forward by this paper for the future operation and development of this kind of power plant.