并联型有源电力滤波器谐波检测与补偿方法研究

发布时间：2018-08-27 17:02

【摘要】：近几十年来,随着工业技术的不断发展,电力电子器件装置及其他非线性装置的大量使用,使得电力系统的谐波污染问题变得日益严重,严重威胁电力系统运行安全。有源电力滤波器(APF)作为一种高效治理谐波的电力电子装置得到了愈来愈广泛的关注。本文首先阐述了谐波产生的背景及对电气设备的危害、谐波的抑制方法、有源电力滤波器的国内外发展情况、分类及并联型有源电力滤波器的基本工作原理,简要的介绍了几种谐波电流检测算法及补偿电流跟踪控制策略。谐波电流检测算法的实时性及准确性是决定有源电力滤波器工作性能的关键之一。本文在详细分析和对比当今较为常用的几种谐波电流检测算法的基础上,决定采用自适应谐波电流检测算法。鉴于传统的自适应谐波电流检测算法反馈信号中夹杂着大量的谐波,降低了系统的检测精度。为克服这种缺点,本文采用误差反馈滤波器对其进行滤波,提高了系统的稳态精度。另外,为了使系统能够快速收敛,本文采用2阶迭代变步长算法,并以负载电流相邻两个基波周期的差值作为补偿调节的一部分,使算法在负载突变时也能够具有较快的跟踪速度。并在MatLab/Simulink环境中建立了谐波电流检测系统的仿真模型,通过仿真,验证了算法的有效性。简要分析了滞环电流控制与空间矢量控制(SVPWM)的优缺点,结合两者的优点,本文采用基于空间矢量的双滞环电流控制策略。针对谐波电流检测算法存在大概一个采样周期的延迟,本文采取拉格朗日插值算法,根据过去的谐波电流检测值来预测下一个采样周期谐波电流值,算法简单,利于实现系统的无差拍跟踪控制。最后,本文搭建了在MatLab/Simulink环境下的有源电力滤波器仿真模型,对比了三种不同控制策略的补偿效果,仿真结果表明,采用空间电压矢量双滞环电流控制策略的有源电力滤波器仿真具有开关频率较低,补偿精度高等优点,能够起到较好的抑制谐波电流的作用,具有良好的动态补偿性能。
[Abstract]:In recent decades, with the continuous development of industrial technology, the power electronic devices and other nonlinear devices are widely used, which makes the harmonic pollution of power system become more and more serious, which seriously threatens the safety of power system operation. Active power filter (APF), as an efficient power electronic device for harmonic control, has received more and more attention. In this paper, the background of harmonic generation and its harm to electrical equipment, the method of harmonic suppression, the development of active power filter at home and abroad, the classification and the basic working principle of shunt active power filter are described. Several harmonic current detection algorithms and compensation current tracking control strategies are briefly introduced. The real-time and accuracy of harmonic current detection algorithm is one of the key factors to determine the performance of active power filter (APF). Based on the detailed analysis and comparison of several harmonic current detection algorithms, the adaptive harmonic current detection algorithm is adopted in this paper. In view of the large amount of harmonics in the feedback signal of the traditional adaptive harmonic current detection algorithm, the detection accuracy of the system is reduced. In order to overcome this shortcoming, the error feedback filter is used to filter the system, which improves the steady-state accuracy of the system. In addition, in order to make the system converge quickly, the two-order iterative variable step size algorithm is adopted, and the difference between the two fundamental periods of the load current is used as a part of the compensation adjustment. So that the algorithm can also have a faster tracking speed when the load changes. The simulation model of harmonic current detection system is established in MatLab/Simulink environment, and the validity of the algorithm is verified by simulation. The advantages and disadvantages of hysteresis current control and space vector control (SVPWM) are briefly analyzed. Combining the advantages of the two methods, a double hysteresis current control strategy based on space vector is adopted in this paper. In this paper, Lagrange interpolation algorithm is used to predict the harmonic current value of the next sampling period according to the previous harmonic current detection value. The algorithm is simple. It is propitious to realize the non-beat tracking control of the system. Finally, the simulation model of active power filter under MatLab/Simulink environment is built, and the compensation effect of three different control strategies is compared. The simulation results show that, The simulation of active power filter using space voltage vector double hysteresis current control strategy has the advantages of low switching frequency and high compensation accuracy. It can restrain harmonic current and has good dynamic compensation performance.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761;TN713.8

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