并联型有源电力滤波器矢量控制研究

发布时间：2018-05-06 15:40

本文选题：有源电力滤波器 + LCL滤波器　；参考：《济南大学》2014年硕士论文

【摘要】：近年来，电力电子技术得到了非常迅速的发展，与此同时相关的电力电子设备也逐渐的应用于工业和人们的日常生活中，它在给人们带来利益和方便的同时，也给电网带来了越来越严重的谐波污染问题。有源电力滤波器(Active Power Filter, APF)是谐波补偿中越来越被重视的一种电力设备，其相关控制策略是研究的核心问题。不过有源电力滤波器并未在国内得到广泛的应用，仍存在着很多问题需要解决。因此，本文将针对APF的控制策略进行深入的研究，研究的主要内容包括：（1）提出一种可抑制电压畸变影响的谐波电流检测方法：改进的单位功率因数UPF(unite power factor)谐波电流检测方法。此方法无需进行坐标变换，因此算法简单，并且当负载发生变化时，也有很好的动态响应性能。为减少电压畸变对系统的影响，本文将锁相环引入到谐波电流检测方法中，因此改进了UPF方法。（2）研究了空间矢量脉冲宽度调制SVPWM(Space Vector Pulse Width Modulation)方法。三相并联型有源电力滤波器(SAPF)的参考指令是电流值而SVPWM参考指令是电压值，因此本文提出了如何用SVPWM跟踪控制SAPF补偿电流参考值的方法，并且通过构造Lyapunov函数，分析了SVPWM控制的SAPF的稳定性。（3）研究了基于LCL滤波器的三相APF的SVPWM控制方法，并且根据串联LCL滤波器的SAPF的拓扑结构，找到了SVPWM的参考电压和三相SAPF参考电流之间的关系。通过二者之间的关系式，将SVPWM控制算法应用于串联LCL滤波器的SAPF中。并且通过构造Lyapunov函数，依据Lyapunov相关定理，分析了SVPWM控制的串联LCL滤波器的SAPF的稳定性。（4）APF的非线性系统通过开关的控制可分为多个线性的动态子系统，本文将切换控制与空间电压矢量控制方法结合起来，，设计了一种简单易行的算法。只需将三相电源电压分为六个扇区，然后利用李雅普诺夫函数方法及全局渐进二次稳定理论，找出一个非常简单的切换律，大大简化了算法。该算法由于合理的运用零矢量，因此明显的降低了逆变器的开关损耗。（5）在实际工程中，各个参数都有额定值的限制，因此均会受到饱和非线性的影响。基于实际工程中出现的问题，本文提出了一种新的考虑饱和限幅的三相APF的控制方法。根据Lyapunov相关定理、凸集理论、凸组合条件将切换控制和SVPWM控制方法相结合，为考虑饱和限幅的三相APF找到了一种新的、简单的稳定性判据。该算法由于合理的应用零矢量，因此明显的降低了逆变器的开关损耗。（6）设计了额定电流为10A的三相APF的各个参数。通过改进的UPF谐波电流检测方法检测出谐波电流——指令电流，利用考虑饱和限幅的三相APF控制策略对APF进行实时控制。仿真分析和实验结果证明了本文提出方法的可行性。
[Abstract]:In recent years, power electronics technology has been very rapid development, at the same time, the related power electronic equipment is also gradually used in industry and people's daily life, it brings benefits and convenience to people at the same time, It also brings more and more serious harmonic pollution to the power grid. Active Power filter (APF) is a kind of power equipment which is paid more and more attention to in harmonic compensation. However, APF has not been widely used in China, and there are still many problems to be solved. Therefore, this paper will carry on the thorough research to the APF control strategy, the main content of the research includes: 1) A harmonic current detection method which can suppress the influence of voltage distortion is proposed: an improved harmonic current detection method for unit power factor (UPF(unite power factor). This method does not need coordinate transformation, so the algorithm is simple and has good dynamic response performance when the load changes. In order to reduce the influence of voltage distortion on the system, the phase-locked loop (PLL) is introduced into the harmonic current detection method, so the UPF method is improved. The space vector pulse width modulation (SVPWM(Space Vector Pulse Width modulation) method is studied. The reference instruction of three-phase shunt active power filter (SAPFF) is the current value and the SVPWM reference instruction is the voltage value. In this paper, a method of using SVPWM to track and control the SAPF compensation current reference value is proposed, and the Lyapunov function is constructed. The stability of SAPF controlled by SVPWM is analyzed. The SVPWM control method of three-phase APF based on LCL filter is studied, and the relation between the reference voltage of SVPWM and the reference current of three-phase SAPF is found according to the topological structure of SAPF of series LCL filter. The SVPWM control algorithm is applied to the SAPF of series LCL filter by the relation between them. By constructing the Lyapunov function and according to the Lyapunov correlation theorem, the SAPF stability of the series LCL filter controlled by SVPWM is analyzed. The nonlinear system of APF can be divided into many linear dynamic subsystems by switching control. In this paper, a simple and easy algorithm is designed by combining switching control with space voltage vector control. The three-phase power supply voltage is divided into six sectors, and then a very simple switching law is found by using Lyapunov function method and global asymptotic quadratic stability theory, which greatly simplifies the algorithm. Due to the reasonable use of zero vectors, the switching loss of the inverter is obviously reduced. 5) in practical engineering, each parameter has the limit of rating, so it will be affected by saturation nonlinearity. Based on the problems in practical engineering, a new control method for three-phase APF with saturation limit is proposed. According to Lyapunov correlation theorem, convex set theory and convex combination condition, a new and simple stability criterion for three-phase APF with saturation limit is obtained by combining switching control with SVPWM control. Due to the reasonable application of zero vector, the switching loss of the inverter is obviously reduced. The parameters of three phase APF with rated current of 10 A are designed. The harmonic current-instruction current is detected by the improved UPF harmonic current detection method, and the three-phase APF control strategy considering saturation limit is used to control the APF in real time. Simulation analysis and experimental results show the feasibility of the proposed method.
【学位授予单位】：济南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761;TN713.8

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