风力发电并网电压扰动信号的分析与检测

发布时间：2019-01-23 17:37

【摘要】：能源紧缺和环境污染如今已成为全世界需要面临的严峻问题,风力发电作为发展最快的清洁能源越来越受到发电行业的重视,然而伴随着风力发电在电网中比率的增大,风力并网所带来的电压暂态扰动也日益凸显,它不仅影响到精密仪器的使用,还会对人们的日常用电产生很大的危害,甚至严重的会造成电网瘫痪。于是对于风电并网引起的电压扰动的检测和分析也就成为研究风电并网的重要研究部分。本文对风电并网引起的电压扰动信号进行分析,并研究了检测和识别暂态电压扰动信号的方法。本文首先分析了风电并网系统引起暂态电压扰动的原因,并建立风电并网系统的仿真模型,分别对风速变化、风机切入切出及负载变化情况对风电并网电压的影响作出仿真分析,得出电压扰动信号的具体类型。鉴于电网电压常会含有噪声,本文结合对匹配追踪算法的迭代跳出判据进行优化,通过仿真取得了良好的去噪效果。基于稀疏分解的思想,本文分析了具体的暂态电压扰动信号,针对其特点构造了风电并网电压扰动原子库,减少了信号分解时的计算量,提高了匹配追踪的速度。通过MATLAB/Simulink仿真,验证了该方法的快速性和有效性。该方法不仅对扰动信号准确分类,并且同时实现了扰动信号的定位和参数估计,辨识方法简单有效,精度较高。
[Abstract]:Energy shortage and environmental pollution have become a serious problem in the world today, and wind power generation, as the fastest-growing clean energy, is more and more important to the power generation industry, but with the increase of the ratio of wind power generation in the power grid, The voltage transient disturbance brought by the wind power grid is also becoming more and more prominent, which not only affects the use of precision instruments, but also can cause great harm to people's daily power consumption, and even cause the power grid to be paralyzed. Therefore, the detection and analysis of the voltage disturbance caused by wind power grid has become an important research part of the research of wind power grid. In this paper, the voltage disturbance signal caused by wind power grid is analyzed, and the method of detecting and identifying the transient voltage disturbance signal is also studied. Firstly, the cause of transient voltage disturbance caused by wind power grid system is analyzed, and the simulation model of wind power grid system is established. The specific type of the voltage disturbance signal is obtained. In view of the noise of the grid voltage regular session, this paper optimizes the iterative jump-out criterion of the matching tracking algorithm, and obtains a good de-noising effect through the simulation. Based on the idea of sparse decomposition, this paper analyzes the specific transient voltage disturbance signal, and constructs a wind power grid voltage disturbance atom library for its characteristics, and reduces the calculation amount at the time of signal decomposition and improves the matching and tracking speed. The rapidity and validity of the method are verified by the simulation of MATLAB/ Simulink. The method not only accurately classifies the disturbance signals, but also realizes the positioning and parameter estimation of the disturbance signals, and the identification method is simple and effective, and the accuracy is high.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM614

【参考文献】