基于时频变换的同步发电机参数辨识方法

发布时间：2018-11-10 07:14

【摘要】：为获取准确的发电机参数尤其是暂态及次暂态参数以满足电力系统日益精细化的仿真要求,提出一种基于时频变换的同步发电机参数辨识方法。该方法首先将时域内的发电机微分方程组变换为频域内的代数方程,消去中间变量并经适当变形后再将原方程变换为时域内的积分方程。之后利用最小二乘法辨识出积分方程的系数,进而根据积分方程系数与发电机参数之间的关系求解出发电机参数。该法适用于大扰动试验,能较好地克服环境噪音和数值计算噪声对辨识的干扰,解决辨识结果不稳定的问题。结合机组投运前必做的甩负荷试验开展的辨识实例表明,所提算法具有较高的辨识精度和收敛性,便于工程应用。
[Abstract]:In order to obtain accurate generator parameters, especially transient and subtransient parameters, to meet the increasingly refined simulation requirements of power system, a time-frequency transform based identification method for synchronous generator parameters is proposed. In this method, the generator differential equations in time domain are first transformed into algebraic equations in frequency domain, the intermediate variables are eliminated and the original equations are transformed into integral equations in time domain after proper deformation. Then the coefficients of the integral equation are identified by the least square method, and the generator parameters are solved according to the relationship between the coefficients of the integral equation and the parameters of the generator. This method is suitable for large disturbance test. It can overcome the disturbance caused by environmental noise and numerical calculation noise, and solve the problem of unstable identification results. Combined with the identification example of load rejection test which must be done before the unit is put into operation, it is shown that the proposed algorithm has higher identification accuracy and convergence, and is convenient for engineering application.
【作者单位】：中国电力科学研究院;浙江大学;
【基金】：国家自然科学基金项目(51107122) 国家电网公司2013年基础性前瞻性科技项目(XT71-13-004)~~
【分类号】：TM31

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