基于改进LCL拓扑的有源电力滤波器实验研究

发布时间：2018-01-24 00:31

本文关键词： 有源电力滤波器谐波抑制无功补偿谐振 LCL滤波器样机实验　出处：《北京交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着科技的发展,电力电子设备的大量使用带来了很严重的电能质量问题。电能质量的高低决定了国民经济的整体水平,谐波和无功污染属于影响电能质量的两个主要因素,因此研究治理谐波和无功补偿的电力电子装置是有重大意义的课题。有源电力滤波器作为一种能够动态抑制谐波和补偿无功的新型电力电子装置,具有广阔的发展前景。目前较多的有源电力滤波器通过LCL拓扑结构接入电网,虽然注入电网的电流波形相对光滑,然而LCL拓扑结构存在谐振点,会引起谐振,严重时引发的振荡使某些次谐波放大,对公用电网产生污染,甚至引起严重事故。因此需要对有源电力滤波器并网结构的LCL输出滤波器进行改进,使谐振得以抑制,同时滤除谐波,补偿无功功率,提高电能质量。本文主要完成了以下研究工作:(1)介绍了谐波和无功的产生以及危害,指出谐波治理的重要性;详细介绍了有源电力滤波器的分类、工作原理,阐述了有源电力滤波器的发展现状。(2)介绍了有源电力滤波器的主电路拓扑结构,并推导出并联型三相三线制有源电力滤波器的数学模型;对有源电力滤波器的输出滤波器拓扑结构进行了深入研究,并提出了改进型LCL滤波器的拓扑结构,导出其数学模型,并设计了有源电力滤波器的主电路参数。(3)详细论述了有源电力滤波器的谐波检测方法和控制方法,分析了各种检测、控制方法的优缺点和工作特性,最终选用了基于瞬时无功理论的ip-iq谐波检测方法和三角波比较控制方法。并用PSIM软件搭建有源电力滤波器系统数字仿真模型,验证了检测方法、控制方法的有效性以及对有源电力滤波器并网拓扑结构改进的可行性以及适用性。(4)结合实验装置,进行了有源电力滤波器控制系统的硬件和软件设计。(5)基于ADSP-21489控制系统,搭建了样机实验平台,进行了 LCL拓扑结构和改进型LCL拓扑结构的谐波补偿对比实验,以及改进型LCL拓扑结构的谐波与无功综合补偿实验。通过实验波形证明了本文所设计的改进型LCL滤波器能够较好的抑制谐振,同时验证了检测、控制算法的有效性和有源电力滤波器参数设计的正确性。
[Abstract]:With the development of science and technology, the extensive use of power electronic equipment has brought about serious power quality problems. The level of power quality determines the overall level of the national economy. Harmonic and reactive power pollution are two main factors that affect power quality. Therefore, it is of great significance to study the power electronic device for harmonic and reactive power compensation. Active power filter is a new type of power electronic device which can dynamically suppress harmonic and compensate reactive power. At present, more active power filters are connected to the power network through LCL topology. Although the current waveform injected into the network is relatively smooth, there are resonance points in the LCL topology. It will cause resonance, and the oscillation caused by serious oscillation will make some sub-harmonics amplify and pollute the public power network. So it is necessary to improve the LCL output filter in the grid-connected structure of active power filter, so that the resonance can be suppressed, harmonics can be filtered and reactive power can be compensated at the same time. To improve the power quality. This paper mainly completed the following research work: 1) introduced the generation and harm of harmonic and reactive power, pointed out the importance of harmonic control; The classification and working principle of active power filter are introduced in detail, and the development status of active power filter is described. (2) the main circuit topology of active power filter is introduced. The mathematical model of shunt three-phase three-wire active power filter is deduced. The topology of the output filter of active power filter is studied, and the topology of the improved LCL filter is proposed, and its mathematical model is derived. The main circuit parameter of active power filter is designed. The harmonic detection method and control method of active power filter are discussed in detail. The advantages and disadvantages and working characteristics of various detection and control methods are analyzed. Finally, ip-iq harmonic detection method and triangle wave comparison control method based on instantaneous reactive power theory are selected. The digital simulation model of active power filter system is built with PSIM software, and the detection method is verified. The effectiveness of the control method and the feasibility and applicability of improving the topology structure of the active power filter (APF) are combined with the experimental device. The hardware and software design of active power filter control system. 5) based on ADSP-21489 control system, a prototype experiment platform is built. The harmonic compensation experiments of LCL topology and improved LCL topology are carried out. The experimental results of harmonic and reactive power compensation of the improved LCL topology show that the improved LCL filter designed in this paper can suppress the resonance and verify the detection at the same time. The validity of the control algorithm and the correctness of active power filter parameter design.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761

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