在辨识水轮机调速器参数时,传统的辨识方法所需测量的信号可能不可测,或者辨识连续时间系统时需要先将系统离散化,从而弓l入各种误差。针对该系统参数辨识中存在的问题,提出了基于Hartley变换的调速器参数辨识方法。该方法利用Hartley调制函数的优越性质,运用Hartley变换测量系统输入输出的微分项,进而建立系统的最小二乘模型,最后用最小二乘法直接辨识系统物理参数。分析建立了调速器辨识模型,用本文提出的方法进行了调速器参数辨识,设计了两组对比试验,其中一组加入高斯白噪声。试验表明该方法不仅辨识精度较高,而且对噪声有较强的抑制能力,验证了本文提出的水轮机调速器参数辨识方法在工程应用中有较高的可行性与有效性。
When dealing with the issue of parameters identification of hydraulic turbine governor, traditional methods face difficulties, such as, the wanted signal is not accessible or it has to disperse the continuous time system at first, which will bring errors undoubtedly. Aiming at the difficulties above, a parameters identification method of hydraulic turbine governor based on Hartley transform is proposed. The new method measures the differential terms of input signal and output signal firstly, making use of the superior properties of Hartley transform, then establishes the least square model of the system arid identify parameters directly with least square method. The identification model is build and the parameters identification is carded out with the proposed method through two experiments, in one of which Gaussian white noise is added. The experimental results show the proposed method has high precision and ability of noise suppression, meanwhile the results verify that the proposed parameters identification method is valid and feasible in engineering practice.