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1、分 类 号 学号 2003611310061 学校代码 10487 密级 硕士学位论文并联型有源电力滤波器的电流数字控制技术学位申请人：方 昕学科专业：电力电子与电力传动指导教师：康 勇 教 授戴 珂 副教授答辩日期：A Thesis Submitted in Partial Fulfillment of the RequirementsFor the Degree of Master of EngineeringThe Digital Control on Current of Parallel Active Power FilterCandidate:Fang XinMajor: Powe
2、r Electronics and Electric DriveSupervisor:Prof. Kang Yong Vice Prof. Dai KeHuazhong University of Science and TechnologyWuhan, Hubei P.R. China 430074April, 2006独 创 性 声 明 本人声明所呈交的学位论文是我个人在导师指导下进行的研究工作及取得的研究成果。尽我所知，除文中已经标明引用的内容外，本论文不包含任何其他个人或集体已经发表或撰写过的研究成果。对本文的研究做出贡献的个人和集体，均已在文中以明确方式标明。本人完全意识到本声明的法
3、律结果由本人承担。 学位论文作者签名： 日期： 年 月 日学位论文版权使用授权书 本学位论文作者完全了解学校有关保留、使用学位论文的规定，即：学校有权保留并向国家有关部门或机构送交论文的复印件和电子版，允许论文被查阅和借阅。本人授权华中科技大学可以将本学位论文的全部或部分内容编入有关数据库进行检索，可以采用影印、缩印或扫描等复制手段保存和汇编本学位论文。 保密 ，在_年解密后适用本授权书。本论文属于 不保密。（请在以上方框内打“”） 学位论文作者签名： 指导教师签名：日期： 年 月 日 日期： 年 月 日89摘 要电力电子技术为工业设备提供了高速、高效和节能的控制手段，但同时也给电网注入了不可
4、忽视的无功以及谐波电流。在众多谐波抑制和无功功率补偿技术中，以有源电力滤波器的应用最为广泛。本文在研制一台三相三线制并联型有源电力滤波器的基础上，对其谐波指令的产生、滞环比较控制进行了介绍和初步的分析。重点对电流环的数字控制方式，包括数字PI调节器的设计、重复控制器的应用做出了比较详细的分析。本文首先给出了三相三线制并联型有源电力滤波器的系统构成以及工作原理。详细地介绍了瞬时无功功率理论，选择检测负载电流的方式以提取谐波。提出了用滑窗迭代作为低通滤波的数字算法，以快速分离负载电流中的基波分量得到谐波指令。在有源电力滤波器的电路结构上建立了数学模型，分析了并网电感对补偿电流的影响。对电流滞环控制
5、的方式进行了介绍和仿真，分析了传统滞环的不足并介绍了两种改进方法。 以全数字控制为重点，本文提出了有源电力滤波器的电流PWM载波控制方式,建立了交流侧带RC滤波器的对象模型。分析了PI参数对系统性能的影响，指出了纯PI调节器在有源滤波中的局限性。进而提出了在数字电流环中引入重复控制技术以提高系统的稳态性能，给出了重复控制器各个环节的设计过程。并建立了重复控制器与PI调节器并联的系统模型，给出了相应的仿真。最后本文通过实际系统的各种实验对所论述的内容进行了验证，并对结果进行了相关分析，实验结果证明了这种数字控制方式的有效性。关键词：谐波抑制 无功功率补偿 有源电力滤波器 瞬时无功功率 滞环控制数
6、字PI调节器 重复控制技术AbstractBeing the fast, potent, and economical control means to industrial devices, power electronics, however, have also deteriorated power quality by injecting the non-negligible harmonics and reactive current to the network. Among those technologies in harmonic suppression and reacti
7、ve compensation, the active power filter (APF) is the most famous one. This thesis, first of all, has introduced the harmonic reference generation of APF and the typical hysteresis control based on the design and realization of the three-phase three-wire parallel APF, and then chosen digital control
8、 as its centre content with detailed analysis on PI conditioner and repetitive control.Firstly, this thesis has presented the system structure and operation principles of three-phase three-wire parallel APF. Specified introductions of the instantaneous reactive power theory are given, and a sliding
9、window recursive method as the low pass filter is proposed which is supposed to depart the fundamental current from the load and get the harmonic reference.The influence on the compensation current, caused by the inductance connecting to the network, is given in this thesis after the establishment o
10、f mathematic model of APF. Typical hysteresis control on current is introduced and its simulation results have depicted its compensation characteristics, which are followed by two improved methods in brief as to overcome the inner deficiencies of traditional hysteresis control.Taking the digital con
11、trol as its centre content, this thesis has proposed a PWM control way on current. The control plant with a RC filter placed on the AC side of APF is established. Whats more, the thesis has analyzed how PI parameters affect the system of APF and pointed out the limitation of simple PI conditioner in
12、 active filtering. In order to achieve better characteristics in the steady state of APF, this thesis has proposed a way of adding the repetitive control technology to the digital current loop. Detailed procedures of designing every block of the repetitive controller are given, and the simulation mo
13、del of an improved current controller with PI conditioner and repetitive controller working in parallel is presented in this thesis. The simulation results are provided after that.In the end, experiments have been carried out in different conditions which are discussed in this thesis, and their resu
14、lts have proved the effectiveness of this digital control method.Keywords: harmonic suppression reactive power compensation active power filter instantaneous reactive power hysteresis control digital PI conditionerrepetitive control目 录摘要IAbstractII1 绪论11.1 电力电子技术概述11.2 有源电力滤波器(APF)简介31.3 本文主要研究内容82 并联型APF的工作原理和谐波检测方法102.1 并联型APF的基本原理102.2 谐波检测位置及其相应控制122.3 谐波指令的提取与瞬时无功功率理论152.4 低通滤波器与滑窗迭代法202.5 本章小结233 并联型APF的滞环控制方式253.1 并联型APF的电路结构和数学模型253.2 并联型APF的滞环比较控制分析293.3 本章小结334 并联型APF的载波控制方式344.1 APF电流环的控制结构344.2 电流环PI参数对系统的影响414.3 电流环PI控制下的系统仿真454.4 本
