南方电网潜在自激现象的研究

The potential existence of self-excitation in south China power system

分析了电力系统自激的产生条件及励磁调节器对自激的影响,研究了自激发生后系统的动态过程,提出了以发电机机端电压、发电机转子角速度以及励磁电流这3个量的变化规律作为判断复杂电力系统发生自激的依据,并以一个典型的双机系统的仿真结果验证了判据的有效性。最后,使用所提出的自激判据,分析了我国南方电网在2005年的两种典型运行方式下发生自激的可能性。

The conditions of self - excitation and the influence of automatic voltage regulator on power system self-excitation are analyzed and the system reaponse characteristics of power system under self-excitation are summarized. A criterrion used to estimate the possibility of power system self-excitation is proposed,which is based on the responses of bus voltage,rotor speed and excitation current in time domain. The effectiveness of the proposed criterion is verified by the simulative results of a typical two-machine power system. The potential existence of self-excitation in south China power system under two typical operation conditions in 2005 is analyzed with the proposed criterion. This project is supported by National Key Basic Research Special Fund of China(G1998020319)and “Pandeng” project of the National 9 th “5 Years’ Plan”(PD9521907).