论文---有源电力滤波器的设计.doc

上海工程技术大学毕业设计（论文） 有源电力滤波器的设计 PAGE 35 摘 要 本文首先通过对电力系统中交流电压和交流电流的傅里叶分析，引出了谐波这一概念。通过分析谐波的相关概念和谐波的产生原因，举例分析了各种谐波源的产生过程，以及谐波对电力系统和用户的影响及危害，说明了抑制谐波的重要性。再通过阐述抑制谐波的各种措施，得出安装滤波器是减小谐波的有效措施。接下来就是本文的重点内容，即滤波器的工作原理，结构，控制方式。而不同类型的滤波器有不同的原理，结构也不一样，控制方式也是多种多样，但它们之间具有密不可分联系，本文进行了详细的分析。 最后，文章阐述并联型有源电力滤波器的设计过程，包括其原理的分析，结构的构思，包含了主电路的设计，电流跟踪方式的选取和直流侧电压的的控制以及区别于其他类型滤波器的优缺点。还成功地用matlab软件构建了一个并联型有源电力滤波器，来模拟并联型有源电力滤波器减少电网谐波的实验，并对其进行波形进行了FFT处理和分析。通过仿真实验研究,结果证实了设计方案的正确性和可行性。 关键词：谐波，并联型有源电力滤波器，脉宽调制，连接电抗器，傅里叶变换 The Design of Active Power Filter ABSTRACT Firstly, AC current and AC voltage of the power system are analysised by Transformation of Fourier in this paper, then it comes up with a concept called harmonic. While analyzing the related concepts and causes of harmonic, it gives examples of the generation process of varieties of harmonic equipment and the impact and damage of harmonics to the power system and users, so it come to a conclusion that it is important to reduce harmonic of the power system. installing filter is an effective measure to reduce harmonic. The next is the focus of the content of this article, such as the working principle, structure and the control mode of filters which are different from each other, but there are lots links with each other, which is analysised detailly in the paper. Finally, a parallel active power filter is designed. Lots of contents are included in the paper, for example ,the structure of the conception, the design of main circuit, selection of tracking mode of current and controling of DC voltage. Advantages and disadvantages different from filters of other types are analysised too. It have successfully built a parallel active power filter and done a experiment of reducing harmonic of power system by the software of MATLAB. All waveshapes in the experiment are processed and analysised by FFT. By results of the simulation experiment, the validity and feasibility of the scheme of the design are proved