【作者】 刘剑飞；

【导师】 傅仲文；

【作者基本信息】 河北工业大学 ， 电气工程， 2014， 硕士

【摘要】 近年来，由于电力电子技术迅猛进步，使得越来越多的非线性负载应用到电力系统之中，因此电力电子设备产生的谐波问题也越来越严重。为了让用户侧的电网电能质量能够得到更明显地改善，有源滤波器（APF）应运而生。本论文选择基于SVPWM的三电平有源电力滤波器作为研究的对象，首先进行理论研究，重点分析了APF在一种新型的跟踪控制方法下的补偿性能，并且搭建了基于SVPWM的三电平有源电力滤波器的Matlab/Simulink系统仿真模型，对系统进行仿真。在谐波电流检测部分采用的理论基础是瞬时无功功率理论，基于这种理论的运算方式主要有p、q和ip、iq两种运算方式。这两种运算方式最大的不同点在于p、q运算方式会因为电网电压发生畸变而出现检测误差，而ip、iq运算方式则不会出现这种情况，因此在搭建Simulink谐波电流检测仿真模块时，选用的是ip、iq运算方式。在谐波电流的跟踪控制部分，本文比较了多电平各种拓扑结构的优缺点，选择二极管钳位式作为逆变器的主体。首先研究了二极管钳位式三电平逆变器运行状态的转换过程，接着将SVPWM的控制原理应用于三电平结构中，以基于三电平结构的空间矢量分布图为研究平台，研究逆变器开关状态与空间矢量的对应关系，将二者关联进一步确定SVPWM控制中参考电压矢量的位置、矢量的作用时间以及开关矢量作用次序的安排，从而完成SVPWM的调制算法。同时本文针对有源滤波器直流侧两个串联电容中点电压的不平衡问题，重点研究了抑制中点电压波动的控制方法，分析了一些开关状态对中点电压波动的影响，在不影响补偿效果的前提下，对中点电压有不利影响的一些冗余开关状态进行舍弃，以保持直流侧电压的稳定。最后，基于Simulink的仿真平台，对基于空间矢量控制的三电平有源滤波器进行仿真，仿真结果表明所采用的方法有很好的补偿效果。更多还原

【Abstract】 In recent years, with the rapid development of power electronic technology, more andmore nonlinear load is used in the power system, so the harmonic problems which arebrought by power electronic devices become more and more serious. In order to improvethe power quality of the user side, active power filter (APF) is born at the right moment.This paper choose three-level active power filter based on space vector PWM control as theresearch object. The theory of APF is studied, and a new kind of track control method onthe compensation performance is emphatically analyzed. The system of three-level APFbased on SVPWM control is set up on Matlab/Simulink platform which can verify thecorrectness of the system.In this paper, the detection part of the harmonic current is based on instantaneousreactive power theory, the detection principle of p、q operation way and ip、iqoperation wayare mainly studied.When the voltage in power grid distorts, p、q operation mode will appearerror, but ip、iqoperation mode is not affected by voltage distortion，so in building thesimulation, ip、iqoperation way is used at the current detection module in this paper.In harmonic current tracking control, this article compares the advantages anddisadvantages of all kinds of multilevel topology structure and choose diode-clamped typeas the main body of the inverter. First, this paper introduce diode-clamped type three-levelinverter working-state conversion process, then bring the principle of space voltage vectorinto the three-level structure and draw the space vector map under three-level structure.Therelationship between space vector and inverter switch state is studied, which furtherdetermines the position、the action time and the arrangement of the order of the switchvector in the space vector control, and forms a complete three-level space vector controlmethod. This paper also focuses on the DC voltage control method of three-level activefilter, and analyzes the impact of some switch state to the midpoint voltage fluctuation.With no impact to the compensation effect, some redundancy switch states which have anadverse effect upon midpoint voltage are abandoned to maintain the stability of the DC sidevoltage.Finally, based on Simulink platform, the three-level active power filter based on spacevector control is simulated. Simulation results show that the method has a goodcompensation effect which verify the effectiveness of the proposed control method.更多还原