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提出一种测取大型同步电机参数的在线辨识方法。阐述和推导了参数辨识原理及辨识模型。首次提出运动方程和外部等效线路方程的辨识模型。在发电机带负载运行时，对励磁系统施加阶跃干扰，量测电机电压、电流及功角的暂态响应。采用简化大扰动数学模型，一次辨识出同步电机电磁参数和运动方程参数，以及等效无穷大电网电压Ｕｃ和等效线路阻抗Ｘｃ。该方法多次应用于我国大型火电站和水电站，先后对１００ＭＷ和２００ＭＷ汽轮发电机和７５ＭＷ水轮发电机进行了在线参数辨识。用辨识参数计算出的电机动态响应与实测结果有很好的一致性。
A method of on-line identification of large synchronous motor parameters is proposed. The parameter identification principle and identification model are expounded and deduced. For the first time, the identification model of the equations of motion and the external equivalent circuit equations is proposed. When the generator is running with load, step excitation is applied to the excitation system to measure the transient response of the motor voltage, current and power angle. Using the simplified and large perturbation mathematical model, the electromagnetic parameters and equations of motion of the synchronous motor are identified at one time, and the equivalent infinite grid voltage Uc and equivalent line impedance Xc are obtained. The method has been applied to many large-scale thermal power station and hydropower station in our country for many times. The on-line parameter identification of 100MW and 200MW turbine generators and 75MW hydroelectric generators has been carried out successively. The motor dynamic response calculated from the identification parameters is in good agreement with the measured results.