【作者】 王敬喜；

【导师】 李裕能；

【作者基本信息】 武汉大学 ， 测试计量技术及仪器， 2004， 硕士

【摘要】 随着电力电子技术的发展，近年来电网中像整流器、变频器、电弧炉等这种具有非线性、冲击性和不平衡用电特性的负荷不断增加，引起供电网中的电流(电压)畸变，产生大量谐波。这些谐波的存在不但对电网造成了污染，而且给用电设备带来了危害。谐波污染己成为供电系统中不容忽视的问题之一，已引起了人们的关注。 本论文首先针对谐波问题，叙述了谐波产生的原因、危害及谐波标准，并介绍了主动型和被动型谐波抑制方法；其次对有源电力滤波器的工作原理、分类和基本组成进行了阐述；最后详细介绍了有源电力滤波器的各种谐波电流检测方法，对谐波电流检测点进行了分析并指出各自的优缺点，阐述了基于瞬时无功理论检测方法的局限性。 在分析各种谐波电流检测方法的基础上，针对有源电力滤波其中广泛采用的基于瞬时无功功率理论的检测技术存在的一系列局限性，将单位功率因数(UPF)的概念引进有源电力滤波器的控制中，全面论述了基于单位功率因数的谐波和无功电流检测技术，并对基于单位功率因数的检测方法的动态特性进行了研究，提出了缩短检测延时的具体方法。为了说明方法的正确性，本文除了对其进行必要的论证和利用MATLAB仿真软件对其进行仿真研究外，还在一套DSP数字控制的并联型有源电力滤波实验装置上进行了实验验证，仿真和实验结果表明了基于单位功率因数的谐波检测和控制技术的有效性和理论分析的正确性。更多还原

【Abstract】 As technique of power electronics develops, the load with nonlinear, impactive, unbalanced characteristics such as current rectifiers, frequency converters, arc furnaces have been increasingly used in power network in recent years. They generate lots of harmonics and cause distortion in power electrical network current (voltage). Power networks had been polluted by harmonics, which do harm to electrical equipments. Harmonic pollution has been one of the non-negligible problems in power supply systems and catches people’ s eye.Firstly, to the problems that caused by harmonic, this paper depicts the reason of harmonic’ s bringing, the harm and the standard of harmonics, and introduces the initiative and passive methods of harmonic restraining; Secondly, the theory, the class and the basic composing of the active power filter are described in detail; At last, the various harmonic current detection methods of power filter are introduced in detail. The points of harmonic current detection are analyzed and their advantages and disadvantages are pointed out. The drawback of instantaneous reactive power theory is expoundedBased on the analysis of various harmonic current detection methods and the drawback of instantaneous reactive power theory, the concept of power factor is introduced into the control system of active power filter. The harmonic and reactive current detection technique based on unity power factor and its application in shunt active power filter is described in detail. This transient characteristic of the detection method is analyzed and the detail method of shortening the detection delay is provided. In order to prove the correctness of the approach, some necessary reasoning and a simulation research used by MATLAB based on the approach and many experiments done bythe experimental equipment of shunt active power filter based on DSP are done in this paper, the results verify the effectiveness of harmonic detection and control method based on unity power factor and validity of theoretical analysis.更多还原