电网谐波电流仿真研究.docVIP

摘要 近年来，随着电力电子技术的发展，电网中具有非线性、冲击性和不平衡用电特性的负荷不断增加，产生大量谐波。电网中的谐波污染日益严重，影响到供电质量和用户使用的安全性，因此电网谐波污染的治理越来越受到关注。 本文首先针对谐波问题，叙述了谐波产生原因、危害等；其次，对谐波及无功功率理论的基本概念及原理进行了较为详细的介绍，并分别介绍了两种检测方法及适用条件；再次就三相三线制及三相四线制电路了搭建模型做出来比较分析；最后介绍了搭建模型具体方法并对仿真波形进行了分析。 本文对平均功率理论和瞬时功率理论进行了分析、比较，指出了它们适用的范围及优缺点。详细介绍了瞬时基于无功功率理论的谐波和无功电流检测方法检测法，并分析了它的检测原理、特点。 本文建立MATLAB/Simulink的仿真模型，着重对基于瞬时无功功率理论的检测法进行仿真，得出较好的谐波检测方案。针对不同的负载和负载突变情况进行了仿真，得出不同方法的使用条件和最优结果。 关键词： ABSTRACT In recent years, with the development of power grids, converters are to be a wide range of development and application. Though its large-scale transformation of the energy and transport play a significant role, it also brought pollution to the power grid, resulting in a harmonic. These harmonics to the electrical equipment hazards. For harmonic suppression and reactive power, power system applications of the filter. However, the shortcomings of passive power filter, active power filter has been a rapid development. This paper describes the harmonic problems, causes,and harm; secondly, describes the basic concept and principle of the harmonic and reactive power theory in detail, and introduces two kinds of detection method and application conditions ; then on the three phase three wire and four phase three wire circuit model is made a comparative analysis of the structures ; finally introduces the specific method of building model and the simulation waveforms are analyzed. This paper analyzes the average power theory system and instantaneous power theory , pointing out that their scope and the advantages and disadvantages. Detailed information on the instantaneous reactive power theory based on harmonics and reactive current detecting method,detection method and analysis of its detection principle, characteristics and use limitation. MATLAB / Simulink simulation model, focusing on instantaneous reactive power based on the theory of harmonic current detection method of detection method simulations, were carried out and compared the experim