使用辨识得到的运算电感模型估计同步发电机d轴等值电路参数

Estimation of d-Axis Equivalent Circuit Parameters of Synchronous Generator by Operational Inductance Model Obtained From Identification

提出了一种利用辨识得到的运算电感模型确定同步发电机d轴等值电路参数的方法。由于辨识得到的运算电感模型的参数通常带有误差,直接根据解析公式求取的等值电路参数值可能远离其真值。为获得较为准确的等值电路参数值,首先将用解析公式计算得到的等值电路参数值作为初值,然后基于发电机的混合状态模型,用预测误差法对等值电路参数进行估计。数值仿真的结果验证了本文所提方法的有效性。

A method to accurately estimate parameters of d-axis equivalent circuit of synchronous generator by operational inductance model obtained from the identification is proposed. Due to the errors in the parameters of operational inductance model obtained from identification in general, the parameters of equivalent circuit directly solved by analytical formulae may be far from their true values. To obtain more accurate parameters of equivalent circuit, firstly the values of equivalent circuit parameters calculated by analytical formulae are taken as initial values, then based on the hybrid state model of generator these parameters of equivalent circuit are estimated by prediction error method. Simulation results show that the proposed method is effective.