大型发电机微机失步保护的研究

为克服间接反映发电机功角的传统失步保护所存在的问题，介绍了一种利用发电机调速系统来直接测量发电机功角的方法。提出了利用微机实现此方法的算法，并对此算法的精度进行了数字仿真分析，给出了算法所带来的误差，表明这种算法精度较高。基于此方法实现的大型发电机微机失步保护与传统的失步保护相比，物理概念明确，并且对失步的判别更加精确。目前，基于此方法的新型微机发电机失步保护已在研制之中。

STUDY ON MICROPROCESSOR-BASED OUT OF STEP PROTECTION FOR LARGE GENERATOR UNITS

In order to avoid the problems caused by traditional out of step protections based on indirect measurement of power-angle. this paper presents a direct method to measure power-angle of generator by using speed control system and puts forward the algorithm to realize it by using microprocessor. Then the algorithm's accuracy and its error, are investigated by simulation and the results are presented in detail. which show that the algorithm has high accuracy and clear concept. The out of step protection for large generator based on this method is simpler and more accurate than that based on traditional method. Presently, the new out of step protection system is being developed.