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针对混沌电力系统参数辨识存在的稳定性差和易受干扰等问题, 提出一种基于未知参数观测器的电力系统参数辨识方法.分析2阶电力系统和4阶电力系统混沌运行状态的数学模型, 并分别针对这2种模型的稳定和混沌状态, 将电力系统的未知参数看作系统的未知状态, 利用非线性状态观测器和稳定性理论, 通过构造非线性增益函数和辅助函数得到未知参数观测器, 实现混沌电力系统的参数辨识.仿真结果表明该方法具有较好的辨识速度和精度, 且具有较好的鲁棒性.“,”In order to solve problems as poor stability, Susceptible to interference, et al in the parameter identification of chaotic power system, a power system parameter identification method based on unknown parameter observer is proposed. Firstly, the mathematical models of the two order power system and the four order power system in the chaotic state are analyzed. Then the unknown parameter is regarded as the unknown state of the chaotic power system. Based on the theory of nonlinear state observer and stability, the unknown parameter observers are presented by selecting nonlinear gain function and auxiliary function. At end, the unknown parameter observers are used to realize the parameter identification of chaotic power system. The simulation results show that the proposed method has better identification speed and accuracy, which also has better robustness.