毕业设计电力系统谐波检测与治理问题的研究

本 科 毕 业 论 文 电力系统无功谐波电流检测措施研究 Detection for Reactive and Harmonic Current in Power System 电力系统无功谐波电流检测措施研究 摘要：伴随国民经济发展和人民生活水平提高，电力电子产品广泛地应用于工业控制领域。这些电力电子装置使得电力系统中谐波污染问题日趋严重。因此，谐波问题分析和治理成为电力系统领域所面临重大课题 本文首先对目前国内外电力谐波检测与分析措施进行了综述与展望，然后对电力谐波基本概念和特性参数进行了阐明。从发电、输电、用电等三个方面讨论了谐波产生原因。从增长输、供和用电设备额外附加损耗；对测量表计影响；对继电保护和自动装置工作及其可靠性影响；对家用电器设备使用和寿命影响等方面入手论述了谐波危害。 目前，无源滤波技术在大多数谐波克制系统使用已经很成熟了，不过由于无源滤波器(PPF)存在诸如易受系统参数影响、只能消除特定次谐波等缺陷。因此有源滤波器(APF)因其动态赔偿谐波优越性能已经成为一项热门研究课题。不过我国有源滤波器技术目前还没有进入实用阶段，多数只是进行理论上探讨研究。本文分析了基于瞬时无功理论谐波检测措施，在这种理论下得到法、检测法措施，并对这两种措施进行了仿真分析。 为了提高APF电流跟踪性能，本文提出了滞环比较法、三角波法和周期采样控制法三种APF电流控制方式。并进行了Matlab仿真试验，仿真成果验证了该滤波装置良好赔偿性能。 关键词: 电力系统谐波；有源电力滤波器；检测；克制；非线性负荷 Detection for Reactive and Harmonic Current in Power System Abstract： Following the development of the national economy and the living standard of people, the electric power electronics product is broadly applied to the control realm in the industry. These electric powers electronic equips to make a harmonic pollution problem with the electrics power system is serious gradually. Therefore, the analysis and suppression of harmonic has been an important topic in the electric power system. This paper first of all made a review and prospective study of the detection and analysis approaches of the harmonious wave both in China and abroad，specified the basic concepts and characteristic parameters of power harmonics，and discussed the generation of harmonics in the terms of power generation, electricity transmission, electricity utility. The harmonic harm was described in terms of following aspects：the increase of additional supplementary load loss of transmission, distributed equipment and electrical installations；the influence on measurement meter, the operation reliability of relaying protection and automatic devices as well as the use and life span of household electrical appliances. At the moment, in harmonic suppress aspect, it has had practical and mature passive technique, but it has many disadvantages. Therefore, these years much research turns to the active power filter for its prior function of compensating harmonics dynamically. and a harmonic detection of the three-phase three-line parallel active power filter-the harmonic current detection p—q and ip—iq based on the instantaneous reactive power theory, and pers simulation analyses in two different case，the steady system and the abrupt load changes. To improve the tracking perance of the current APF proposed in this paper hysteresis , triangular wave and periodic sampling control three kinds of APF current control. And make a Matlab simulation. Keywords：Power system harmonics; active power filter; suppression; nonlinear loads; 目 录 第一章 绪论4 1.1谐波提出及研究意义4 1.2国内外电力谐波检测与分析措施研究现实状况5 1.3 电力谐波检测与分析措施发展趋势7 1.4 谐波克制技术发展现实状况7 1.4.1国外克制技术研究现实状况7 1.4.2国内克制技术研究现实状况9 1.5本文重要研究工作9 第二章 电力谐波分析11 2.1电力谐波基本概念11 2.1.1电力谐波表达措施11 2.1.2谐波特性量12 2.2