新型多电平有源滤波器主电路和控制策略的研究

发布时间：2018-03-03 05:40

本文选题：有源电力滤波器　切入点：多电平电路　出处：《东北石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：电力电子设备的大量使用会给电能质量造成污染,由谐波引起的各种故障和事故经常给社会造成巨大经济损失。有源电力滤波器(Active Power Filter,APF)是消除电网各次谐波补偿无功功率的有效手段,其在国内外生产中也有应用。但随着电网的发展,装机容量的提高,对APF的要求也随之增加,但APF受到电力电子器件的功率和控制效果互相制约的限制,对于提高APF的容量并维持系统良好的性能是近几年APF研究的新方向。本文主要研究的重点多电平有源滤波器的主电路结构、谐波检测方法以及相应的控制策略。首先对有源电力滤波器国内外当前的研究现状进行分析介绍,并对未来发展的趋势进行阐述。之后对有源滤波器的滤波原理进行分析,并介绍有源滤波器的分类结构,对本文所言研究的多电平有源滤波器的主电路结构进行详细介绍,在对经典主电路结构的研究基础上提出一种新型的多电平主电路结构,该结构在开关数目上有所减少,且易于实现模块化,对其工作原理进行分析,并对其进行数学模型分析,得到所设计的新型主电路结构可采用线性分析的结论。其次,介绍几种谐波检测理论并比较其优缺点,对基于瞬时无功功率理论的谐波检测原理进行详细介绍,并对其常用的qp?和qpii?两种谐波电流检测方法进行详细介绍,在qpii?检测法的基础上进行改进,省略相间坐标变换环节,在电压变换处增加预置补偿角以配合开关器件的死区时间,并通过MATLAB仿真软件对上述三种方法进行比较验证。再次,本文分析多电平有源电力滤波器的控制策略,简述阶梯波调制法、三角载波调制法、空间矢量调制法、Sigma-delta调制法以及特定谐波消去控制的特性及优缺点。确定本文采用特定谐波消去控制,详细论述特定谐波消去法的构成、控制原理以及控制特性,并分析该控制法在本文所设计结构中所存在的研究重点与实现方法,在其基础上对初值选取进行改进,并利用牛顿艾特金加速公式,提高控制计算速度。最后,对其仿真参数进行设计,搭建仿真模型,应用MATLAB仿真软件进行仿真验证。仿真结果表明,本文提出的新型多电平主电路结构、改进的qpii?检测方法和特定谐波消去控制方法的正确性和有效性。
[Abstract]:The extensive use of power electronic equipment will pollute the power quality. All kinds of faults and accidents caused by harmonics often cause huge economic losses to the society. Active Power filter (APF) is an effective means to eliminate the harmonic compensation of reactive power. But with the development of power grid and the increase of installed capacity, the requirement of APF is also increased. However, APF is restricted by the power and control effect of power electronic devices. To improve the capacity of APF and maintain the good performance of the system is a new direction of APF research in recent years. The harmonic detection method and the corresponding control strategy. Firstly, the current research situation of APF at home and abroad is introduced, and the future development trend is described. Then, the filter principle of APF is analyzed. The classification structure of active power filter is introduced, and the main circuit structure of multilevel active power filter studied in this paper is introduced in detail. Based on the research of classical main circuit structure, a new multilevel main circuit structure is proposed. The structure is easy to be modularized and reduced in the number of switches. The working principle of the structure is analyzed, and the mathematical model is analyzed. The conclusion that the new main circuit structure can be designed by linear analysis is obtained. Several harmonic detection theories are introduced and their advantages and disadvantages are compared. The harmonic detection principle based on instantaneous reactive power theory is introduced in detail. And qpii? Two harmonic current detection methods are introduced in detail in qpii? The detection method is improved by omitting the phase coordinate transformation link, adding preset compensation angle at the voltage conversion to match the dead time of the switch device, and comparing the above three methods with the MATLAB simulation software. In this paper, the control strategy of multilevel active power filter is analyzed. The characteristics, advantages and disadvantages of Sigma-delta modulation method and special harmonic elimination control method are discussed in detail, and the constitution, control principle and control characteristics of specific harmonic elimination method are discussed in detail. The research emphasis and implementation method of the control method in the structure designed in this paper are analyzed. On the basis of it, the selection of initial value is improved, and the speed of control calculation is improved by using Newton Aitkin's accelerated formula. The simulation parameters are designed, the simulation model is built, and the simulation is verified by MATLAB software. The simulation results show that the proposed new multilevel main circuit structure, the improved qpii? The correctness and effectiveness of the detection method and the specific harmonic elimination control method.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM761.12;TN713.8

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