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摘要随着改革不断深化，电力安全事关社会的稳定和人民的幸福生活，所以我国对电力系统和电力市场也给予了足够的重视，电能质量问题也引起了全社会关注的焦点。因为生产和生活水平的不断改善，大量非线性电力负载被充斥于方方面面，进而也使电网的谐波污染程度愈发加深。故而，人们不断对谐波的问题进行探讨就是为了能够得到更好的检测和治理的措施，所以根据目前的状况，其已经成为了一件迫在眉睫的任务。39872
- 上一篇：并联有源电力滤波器的研究
- 下一篇：风电场风速和发电功率预测研究
本文首先阐述了国内外谐波问题的现状，介绍了抑制电网谐波的主要方式，从传统的LC滤波器到有源电力滤波器及其未来的发展趋势。介绍了电力谐波的基本概念和非线性负载谐波的来源及影响，并分析了几种典型的非线性谐波源。然后对非线性负载的谐波源建立了数学模型，并得出结论，是用数学公式推导得到的，利用 matlab6.5 软件中的 SIMULINK 仿真环境为平台建立了模型，仿真结果表明，非线性负荷用户对线性用户产生的影响。由于非线性元件的存在等原因而在电力系统中产生的谐波对电网产生较大的影响，因此在电力系统中的谐波潮流计算是非常重要的。
谐波潮流计算是谐波问题研究中的一个重要分支，是了解电网谐波特性和进行谐波分析的重要手段，不仅可以描绘出各种工况下全网的谐波潮流分布，计算出各监测点的谐波指标，同时还可以分析产生各种谐波现象的内在原因，进而提出抑制谐波的措施。本文结合非线性电路理论概述了电力系统谐波潮流计算的基本原理，并对应用于谐波潮流计算的算法进行了分析和评述。
毕业论文关键词 电力系统谐波；脉宽调制；有源电力滤波器；瞬时无功功率理论
Abstract
With the deepening of reform, electric power safety is related to social stability and people's happiness, so our country to the power system and electricity market also gave sufficient attention, power quality problem has caused the focus of attention of the whole society. Because of the continuous improvement of production and living standards, a large number of non-linear power load is filled in every aspect, and also the harmonic pollution in power grid increasingly deepened. Therefore, people are constantly on the harmonic problem to discuss is in order to be able to get the better detection and treatment measures, so according to the current situation. It has become the an urgent task.
Firstly, this paper describes the status of domestic and international harmonic problems, introduces the principal way to suppress the harmonics from the traditional LC filter to active power filter and its future development trend. The harmonic in power system and the basic concepts of nonlinear load harmonic sources and influence, and the analysis of several typical nonlinear harmonic source. Then the nonlinear load harmonic sources established mathematical model, and draws the conclusion is obtained by the mathematical formula, using MATLAB6.5 software SIMUINK simulation environment as a platform to build model, simulation results show that, generated by the nonlinear load users of linear user. Due to the nonlinear element in the presence of other reasons and in the power system of harmonic to the power grid greatly influence, therefore in the power system harmonic power flow calculation is very important.
Harmonic power flow calculation is an important branch of harmonic research is to understand the characteristics of the harmonic wave in the power grid and an important means for harmonic analysis of the can not only describe the various conditions of the whole network harmonic power flow distribution, calculated the monitoring points of the harmonic index, but also can analysis produce a variety of harmonic phenomenon of internal reasons, and then put forward the harmonic suppression measures. Combined with nonlinear circuit theory outlined the basic principles of power system harmonic power flow calculation, and analysis and comment on the application in the calculation of harmonic power flow algorithm.
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