基于风力机模拟器的风机机械动态模拟的准确性分析与改进

发布时间：2018-05-24 12:51

本文选题：风力机模拟器 + 机械动态模拟　；参考：《南京理工大学》2017年硕士论文

【摘要】：风力机模拟器(Wind Turbine Simulator,WTS)作为替代实际风力机的重要工具,可以简化风电研究的实验过程,缩短风电技术的研发周期。考虑到大转动惯量导致的风力机慢机械动态已经成为现代商用风电机组不容忽视的特点之一,而WTS的转动惯量却远远小于实际风力机。同时,当前WTS对风机机械动态的模拟主要关注模拟系统的稳定性问题,较少涉及机械动态模拟的准确性问题。因此,本文以风力机模拟器为平台,围绕风机机械动态的准确模拟开展了如下的研究工作:1)发现WTS在模拟风机机械动态时会出现准确性的问题,并对此提出将WTS的转速轨迹的统计指标(转速误差εn、转速误差标准差σn)以及风机效率评价指标(平均风能利用率Pfavg)等参数作为准确性的评价指标,用于评价WTS的机械动态模拟的准确程度;2)从时域角度对WTS的传动链进行建模,探索影响机械动态模拟准确性的因素,重点分析了阻尼和转速噪声这两个参数对准确性的影响机理。并在此基础上,分别设计了基于阻尼补偿和转速噪声抑制的改进策略,通过实验验证了它们能够有效抑制阻尼误差和转速噪声对WTS传动链的影响。3)将阻尼补偿和转速噪声抑制改进策略应用于WTS实验平台,并开展了风电机组的最大功率点跟踪控制的实验。实验结果表明改进后的WTS能够更加准确地模拟风力机的机械动态过程。
[Abstract]:As an important tool to replace the actual wind turbine, the wind turbine simulator can simplify the experimental process of wind power research and shorten the research and development period of wind power technology. Considering that the slow mechanical dynamics of wind turbine caused by large moment of inertia has become one of the characteristics of modern commercial wind turbine, the moment of inertia of WTS is much smaller than that of actual wind turbine. At the same time, the current simulation of fan mechanical dynamics by WTS is mainly concerned with the stability of the simulation system, but less on the accuracy of mechanical dynamic simulation. Therefore, based on the wind turbine simulator, the following research work has been carried out around the accurate simulation of fan mechanical dynamics in this paper. (1) We find that WTS has the problem of accuracy in simulating fan mechanical dynamics. In this paper, the statistical index (rotational speed error 蔚 n, rotational speed error standard deviation 蟽 n) and fan efficiency evaluation index (average wind energy utilization ratio) of WTS are put forward as the accuracy evaluation index. In order to evaluate the accuracy of mechanical dynamic simulation of WTS, the paper models the transmission chain of WTS from the point of view of time domain, and explores the factors that affect the accuracy of mechanical dynamic simulation. The influence mechanism of damping and rotational speed noise on accuracy is analyzed. On this basis, the improved strategies based on damping compensation and speed noise suppression are designed, respectively. Experimental results show that they can effectively suppress the influence of damping error and rotational speed noise on WTS transmission chain. 3) the improved damping compensation and speed noise suppression strategies are applied to the WTS experimental platform. The experiment of maximum power point tracking control of wind turbine is also carried out. The experimental results show that the improved WTS can more accurately simulate the dynamic process of the wind turbine.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM315

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