有源滤波器谐波检测与控制关键技术研究

发布时间：2018-06-20 00:13

本文选题：自适应谐波检测算法 + 有源电力滤波器　；参考：《中国矿业大学》2015年硕士论文

【摘要】：日益增多的电力电子器件和非线性负载使电力系统电能质量受到谐波影响,谐波的存在会给发电、输电、用电设备带来问题,而人们对电能质量的要求越来越高,因此治理谐波、提高电能质量刻不容缓。有源电力滤波器作为一种动态的谐波治理设备成为大家的研究热点,本文主要对主电路参数、自适应谐波检测算法、软件锁相环等方面对有源电力滤波器做了深入研究,并利用仿真和实验对所采用的谐波检测算法和控制方案进行了验证。首先对谐波的危害进行了分析,查阅文献,对有源电力滤波器的发展以及工作原理进行了介绍,并对近年来的主要研究方向进行了总结,对不同研究方向进行了简单介绍,针对研究热点,确定了本文的研究方向;建立了有源电力滤波器的数学模型,并对不同坐标系下的数学模型的应用进行了说明;通过理论分析和计算对有源电力滤波器的主电路元器件的参数进行了探讨,为之后的仿真和实验平台的搭建提供理论支撑。然后针对目前定步长自适应谐波检测算法无法兼顾检测精度和快速性的缺点,根据数学理论对现有的自适应算法进行改进,利用带有自适应增益的动态步长进行迭代计算,使得在保证检测精度的基础上还能维持较高的动态响应能力,对改进的自适应谐波检测算法进行了仿真和DSP实验,验证了算法的有效性。针对平台之前采用的基于过零点的锁相方法的缺点,研究了软件锁相环的原理和实现方法,并对软件锁相在三相不平衡和电压畸变情况下的性能进行了分析,本文采用滤波器来对干扰进行滤除,对改进的软件锁相算法进行了仿真和实验研究;本文采用基于dq旋转坐标系的控制方案,对dq坐标系下的控制进行了详细介绍,并对其稳定性进行分析;对常用的空间矢量调制算法的工程实现进行了简要介绍,并对控制系统的硬件和软件进行了设计。最后,针对本文采用的谐波检测算法和控制方案,对有源电力滤波器系统整体进行了仿真和部分实验研究,验证了本文采用算法的有效性。
[Abstract]:The power quality of power system is affected by harmonics due to the increasing number of power electronic devices and nonlinear loads. The existence of harmonics will bring problems to power generation, transmission and electrical equipment, and the demand for power quality is becoming higher and higher. Therefore, it is urgent to control harmonics and improve power quality. As a kind of dynamic harmonic control equipment, active power filter (APF) has become a hot research topic. In this paper, the main circuit parameters, adaptive harmonic detection algorithm, software phase-locked loop and other aspects of APF are studied deeply. The harmonic detection algorithm and control scheme are verified by simulation and experiment. Firstly, the harms of harmonics are analyzed, literature review, the development and working principle of APF are introduced, the main research directions in recent years are summarized, and the different research directions are briefly introduced. According to the research focus, the research direction of this paper is determined, the mathematical model of active power filter is established, and the application of mathematical model in different coordinate system is explained. Through theoretical analysis and calculation, the parameters of the main circuit components of active power filter are discussed, which provides theoretical support for the subsequent simulation and experimental platform. Then, aiming at the shortcoming that the current adaptive harmonic detection algorithm with constant step size can not take into account the accuracy and rapidity of detection, the existing adaptive algorithm is improved according to mathematical theory, and the iterative calculation of dynamic step size with adaptive gain is carried out. The improved adaptive harmonic detection algorithm is simulated and DSP experiments are carried out to verify the effectiveness of the algorithm. In view of the shortcomings of the zero-crossing point based phase-locking method adopted before the platform, the principle and implementation method of the software phase-locked loop are studied, and the performance of the software phase-locked loop in the case of three-phase imbalance and voltage distortion is analyzed. In this paper, the filter is used to filter the interference, the improved software phase-locked algorithm is simulated and experimentally studied, the control scheme based on the dq-rotating coordinate system is adopted, and the control under the dq coordinate system is introduced in detail. The stability of the control system is analyzed, the engineering implementation of the commonly used space vector modulation algorithm is briefly introduced, and the hardware and software of the control system are designed. Finally, aiming at the harmonic detection algorithm and control scheme adopted in this paper, the simulation and some experiments of the active power filter system are carried out to verify the effectiveness of the proposed algorithm.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713.8;TM935

【参考文献】