并联型三相三线制有源电力滤波器控制系统研究

发布时间：2018-06-07 15:25

本文选题：有源电力滤波器 + 谐波检测　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：新型电力电子设备的大量应用将使电能质量面临严峻的挑战。其中,电流谐波问题是影响电能质量的普遍问题。在治理电流谐波方面,有源电力滤波器(Active Power Filters,简称APF)具有重要的作用。APF可动态补偿谐波电流,并且应用场合灵活。然而,APF在诸多方面仍然存在不足,比如在谐波的检测和补偿精度方面都有待提高。针对这些不足,本文将对APF控制系统展开充分研究。为获得较好的谐波估计性能,本文通过构造负载电流的状态方程,采用卡尔曼滤波器对谐波分量进行在线估计。为优化谐波检测的动态性能,本文提出了一种根据电流运行状态,实时调整滤波器参数的方法,以提高谐波检测的动态响应速度。同时,针对传统锁相环角频率估计的缺点,本文设计了基于状态观测器的电压角频率估计器,为谐波检测以及控制器提供较准确的角频率参数。并在此基础上,通过Simulink仿真验证谐波和角频率估计算法的性能。本文在深入分析APF控制系统的基础上,建立APF系统数学模型,提出了一种基于输出调节的电流跟踪控制器,以实现电网电流对负载基波电流的跟踪和谐波电流补偿。同时,为了提高系统的鲁棒性,减少APF系统性能受参数摄动的影响,在参数已知的系统误差模型基础上,建立含有未知参数的系统误差模型,设计自适应反步法电流控制器,并实时对参数进行在线估计。仿真表明,本文设计的电流控制器在基波电流跟踪方面具有较高的精度和较好的鲁棒性。在理论和仿真分析的基础上,本文搭建了APF硬件系统的半实物实验平台,对控制器的性能进行实验分析。实验结果表明谐波和角频率估计,以及电流控制策略在硬件平台上具有较好的性能。
[Abstract]:The application of new power electronic equipment will make the power quality face severe challenge. Among them, the current harmonic problem is a common problem affecting the power quality. Active Power filters (APFs) play an important role in controlling current harmonics. APF can dynamically compensate harmonic currents, and its applications are flexible. However, APF still has shortcomings in many aspects, such as harmonic detection and compensation accuracy need to be improved. In view of these shortcomings, this paper will fully study the APF control system. In order to obtain better harmonic estimation performance, this paper constructs the state equation of load current and uses Kalman filter to estimate harmonic components online. In order to optimize the dynamic performance of harmonic detection, a method of adjusting filter parameters in real time according to the current running state is proposed to improve the dynamic response speed of harmonic detection. At the same time, aiming at the shortcoming of traditional phase-locked loop (PLL) angular frequency estimation, a voltage angular frequency estimator based on state observer is designed in this paper, which can provide accurate angular frequency parameters for harmonic detection and controller. On this basis, the performance of harmonic and angular frequency estimation algorithm is verified by Simulink simulation. Based on the deep analysis of the APF control system, the mathematical model of the APF system is established, and a current tracking controller based on output regulation is proposed to track the load fundamental current and compensate the harmonic current. At the same time, in order to improve the robustness of the system and reduce the effect of parameter perturbation on the performance of APF system, based on the system error model with known parameters, the system error model with unknown parameters is established, and an adaptive backstepping current controller is designed. The parameters are estimated online in real time. Simulation results show that the proposed controller has high accuracy and robustness in fundamental current tracking. On the basis of theoretical and simulation analysis, the hardware-in-the-loop experimental platform of APF hardware system is built, and the performance of controller is analyzed experimentally. The experimental results show that the harmonic and angular frequency estimation and current control strategy have good performance on the hardware platform.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM761

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