200 MW发电机低励限制定值整定与失磁保护校核计算

Setting Calculation of Underexcited Limitation and Checking Calculation of Loss of Excitation Protection in 200 MW Generator

南海发电一厂1号发电机低励限制曲线超出静稳边界,需对低励限制定值进行重新整定计算,并校核失磁保护与低励限制保护的配合关系。通过计算静稳圆坐标值、失磁保护异步边界阻抗圆坐标值和低励限制定值,得出静稳圆、阻抗圆、低励限制曲线在P—Q平面上的配合关系图。校核结果表明,发电机进相运行时,失磁保护后于低励限制保护动作,说明发电机低励限制参数整定正确。

The underexcited limitation curve of No. 1 generator is beyond the static stability boundary in Nanhai NO. 1 Power Plant, so the setting value of the underexcited limitation should be recalculated and the cooperation relationship between the loss of excitation protection and the underexcited limitation protection should be checked. By calculating the circle coordinate value static stability, the circle coordinate value of asynchronous boundary impedance of loss of excitation protection and the setting value of underexcited limitation, the cooperation relationship map of static stability circle, impedance circle and underexcited limitation curve on P-Q plane is obtained. Checking results show that the action of loss of excitation protection is after the action of underexcited limitation protection during the forward phase operation of generator which explains that the setting parameters of generator underexcited limitation is correct.