采用三相突然短路法测量同步电机参数

An Approach to Measurement Methods of Synchronous Machine Parameters by Using Sudden Short Circuit Test

用突然短路法测量同步电机参数,采用作者研制的具有 dq变换功能的电机数据采集系统来直接测量突然短路电流的 d、q 轴分量,并对连续测量的 i_d、i_q 进行参数辨识,即可获得同步电机的短路参数。这种方法的优点是每个周期内的采样点比较少,采用最小二乘法进行参数估计的收敛性能够得到保证。文中还对三相短路的不同时性对测试结果的影响进行了探讨。给出了三相模拟发电机的试验结果。

A new method of determination of the synchronous machine parameters using sud- den short circuit test is investigated in this paper.The d,q axis components of short circuit current are measured directly using the data acquisition system made by authors,and the parameters of synchronous machine can be identified using the discrete data of i_d,instead of the three phase short circuit currents.The advantage of this method is that the number of sample point in each period is much less than that of conventional method,and the convergence is guaranteed when the parameters are estimated by using least square method. The effect on errors caused by switches of the three phases,which are not simultaneously close,is also dis cussed in this paper,result shows that the new method is less sensitive than conventional method.