并联型APF控制策略及输出滤波器研究

发布时间：2018-02-26 12:42

本文关键词： 谐波抑制有源电力滤波器 LCL滤波器并联阻尼　出处：《大连理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：近年非线性电力电子设备的广泛应用,给电网带来严重的谐波污染,降低了电能质量,因此谐波治理受到越来越多的重视。为克服传统无源滤波器体积大、易谐振等缺点,补偿特性好、体积小的有源电力滤波器应运而生。然而,有源电力滤波器的三相桥式变换电路会引入开关谐波,增加系统谐波含量,这就需要在变换电路输出端增加并网滤波器,以减少注入电网的谐波。目前,针对有源电力滤波器的研究主要集中于控制策略方面,对并网滤波器的研究较少,并网滤波器的优化设计将有利于有源电力滤波器补偿性能的提升。本文首先分析了有源电力滤波器的选择方法、工作原理,概述了常用的指令电流检测方法和电流跟踪控制策略；其次分析了常见的单电感滤波器和LCL滤波器的特点及设计方法,从系统稳定性、电流衰减特性、阻尼损耗和电源内电抗及谐波对补偿结果影响方面,对比串联阻尼LCL滤波器和并联阻尼LCL滤波器的滤波特性；在此基础上,通过系统闭环传递函数得到三种有源阻尼LCL滤波器实现方法。针对无源阻尼LCL滤波器的缺点,提出一种新型LCL滤波器拓扑结构,在电容支路中增加滤波电感,加快滤波器在高频段的衰减速率,将阻尼电感并联在电源侧电感两端,减小阻尼损耗。利用MATLAB分析电源侧电感与逆变器侧电感比值、阻尼电阻值对电流衰减特性和阻尼损耗特性的影响并进行仿真,结果表明：新型LCL滤波器在提高衰减特性的基础上能减小阻尼损耗,采用新型LCL滤波器系统总谐波失真可以从28%降低至1.2%。在此基础上,进行并联电压型有源电力滤波装置的软硬件设计和实验验证。实验的控制系统由双DSP28335实现,由CPLD (EPM570)控制AD7606作A/D转换,双口RAM实现数据存储及主DSP和从DSP的通信。在实验平台上完成了不同电压等级下单电感滤波器、LCL滤波器及新型LCL滤波器的对比补偿实验,结果表明：新型LCL滤波器能实现较好的补偿,且其阻尼损耗比传统LCL滤波器低。
[Abstract]:In recent years, the wide application of nonlinear power electronic equipment has brought serious harmonic pollution to the power network and reduced the power quality. Therefore, more and more attention has been paid to harmonic treatment. In order to overcome the disadvantages of the traditional passive filter, such as large size and easy resonance, etc. The small size active power filter emerges as the times require. However, the three-phase bridge conversion circuit of the active power filter will introduce switching harmonics and increase the harmonic content of the system. It is necessary to add grid-connected filters at the output of the converter circuit to reduce the harmonics injected into the power grid. At present, the research on active power filter is mainly focused on the control strategy, but the research on grid-connected filter is less. The optimal design of grid-connected filter will help to improve the compensation performance of APF. Firstly, this paper analyzes the selection method and working principle of APF. The common current detection methods and current tracking control strategies are summarized. Secondly, the characteristics and design methods of single inductor filter and LCL filter are analyzed, including system stability and current attenuation characteristics. The effects of damping loss, reactance and harmonics on the compensation results are compared. The filtering characteristics of series damped LCL filter and parallel damped LCL filter are compared. Three kinds of active damping LCL filters are obtained by the closed-loop transfer function of the system. Aiming at the disadvantages of passive damped LCL filters, a new topology of LCL filters is proposed, which increases the filter inductance in the capacitor branch. The attenuation rate of filter in high frequency band is accelerated, and the damping inductance is connected at the two ends of the power side inductor to reduce the damping loss. The ratio of the power side inductance to the inverter side inductance is analyzed by MATLAB. The effect of damping resistance on the current attenuation and damping loss is simulated. The results show that the new LCL filter can reduce the damping loss on the basis of improving the attenuation characteristics. The total harmonic distortion of the new LCL filter system can be reduced from 28% to 1.2. On this basis, the hardware and software design and experimental verification of the shunt voltage active power filter device are carried out. The control system of the experiment is realized by double DSP28335. CPLD / EPM570) controls AD7606 to make A / D conversion, and dual port RAM realizes data storage and communication between master DSP and slave DSP. On the experimental platform, the comparison and compensation experiments of different voltage order order inductor filters and new LCL filters are carried out. The results show that the new LCL filter can achieve better compensation and its damping loss is lower than that of the traditional LCL filter.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713.8;TM761

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