基于功角测量的同步发电机参数辨识频域法

On-line Frequency Response Method of Synchronous Machine Parameter Identification Based on Rotor Angle Measurement

功角测量为同步发电机参数辨识提供了方便。文中介绍了功角可测时在线频率响应(OLFR)辨识方法的原理,重点分析了OLFR方法的可辨识性,指出采用OLFR方法可以惟一辨识q轴所有参数和d轴的电抗参数。将OLFR方法与时域辨识方法进行了比较,结果表明对于q轴稳态电抗,2种方法都具有很高的精度;对于q轴瞬态参数,OLFR方法辨识效果优于时域辨识;而对于d轴稳态电抗,采用时域辨识方法得到的参数精度高于OLFR方法。

The measurement of rotor angle makes it convenient for parameters identification of synchronous machines. The basic principle of on-line frequency response （OLFR） method is introduced in this paper. The results of identifiability analysis show that, with OLFR method, all q-axis parameters and d-axis reactance can be uniquely identified. The comparison between OLFR method and time-domain method indicates that, though two methods both have high accuracy in identification of q-axis static reactance, OLFR method is better in identification of q-axis transient parameter, and when considering the d-axis static reactance, the time-domain method has higer accuracy than OLFR method.