基于多内模复合控制的有源电力滤波器研究及其在微电网中的应用

发布时间：2018-05-11 05:44

本文选题：微电网电能质量 + 三相四线制APF　；参考：《太原理工大学》2016年硕士论文

【摘要】：为了应对大规模新能源发电对传统电网造成的不利影响,近年来,国内外专家和学者提出了微电网的概念,用于解决分布式电源并网与传统电网稳定运行之间的矛盾。但是微电网中电力电子并网装置的广泛应用以及单相/三相变频器等非线性负荷的推广普及,给微电网系统注入了大量谐波、不平衡电流,严重危害微电网系统安全可靠运行。为了解决这个问题,将有源电力滤波器(active power filter,APF)用于微电网提高其电能质量逐渐成为热门的研究方向。本文结合当前有源电力滤波器APF的理论知识和关键技术,提出了在αβγ静止坐标系下采用多内模复合控制策略设计三相四线制APF电流环控制器,通过理论分析、数学建模、软件仿真和硬件平台测试等,研制了用于低压微电网的三相四线制APF样机。通过本文的研究主要获得以下成果:(1)在总结有源电力滤波器APF相关理论知识和低压微电网电能质量及其控制技术最新研究成果的基础上,基于无谐波检测控制原理,提出在αβγ静止坐标系下采用多内模复合控制策略设计三相四线制APF的电流环控制器。(2)在对不同拓扑结构的三相四线制APF进行对比分析的基础上,选择了四桥臂逆变器作为其主电路,并直接将网侧电流、直流母线电压作为三相四线制APF的状态变量建立了其数学模型。(3)在αβγ静止坐标系下提出的多内模复合控制策略利用矢量谐振控制频率适应性好和稳定裕度大的优点实现对基频分量的快速跟踪控制,利用重复控制计算量小的特点实现对周期性谐波信号的有效跟踪控制,具有动态响应速度快、稳态精度高、计算量小的特点。(4)通过建模分析、软件编程、硬件设计和实验平台,实现了采用多内模复合控制策略的三相四线制APF,并通过相关仿真和实验进行了验证。(5)研究结果表明,采用本文所提出的多内模复合控制策略的三相四线制APF能够有效解决低压微电网的电流波形畸变、功率因数低、负荷不平衡等问题,对于其在微电网的进一步工程应用具有很强的指导意义。
[Abstract]:In order to cope with the adverse effects of large-scale new energy generation on traditional power grid, in recent years, experts and scholars at home and abroad have put forward the concept of micro-grid, which is used to solve the contradiction between distributed generation and stable operation of traditional power grid. However, the wide application of power electronic grid-connected devices in microgrid and the popularization of nonlinear loads such as single-phase / three-phase inverter have injected a large number of harmonics and unbalanced currents into microgrid systems, which seriously harm the safe and reliable operation of micro-grid systems. In order to solve this problem, active power filter (APF) used in microgrid to improve its power quality has gradually become a hot research direction. Based on the theoretical knowledge and key technology of active power filter (APF) at present, this paper presents the design of three-phase four-wire APF current loop controller using multi-internal model compound control strategy in 伪尾纬 stationary coordinate system. A three-phase four-wire APF prototype for low voltage microgrid was developed by software simulation and hardware platform testing. Based on the summary of APF theory knowledge of active power filter and the latest research results of low voltage microgrid power quality and its control technology, the principle of harmonic free detection and control is obtained. In the 伪尾纬 stationary coordinate system, the multi-internal model compound control strategy is used to design the three-phase four-wire APF current loop controller. Based on the comparative analysis of three-phase four-wire APF with different topologies, this paper presents a new method for designing three-phase four-wire APF with different topologies. The four-leg inverter is chosen as its main circuit, and the grid-side current is directly connected. DC bus voltage as the state variable of three-phase four-wire APF, the mathematical model of DC bus voltage is established. (3) in 伪尾纬 stationary coordinate system, the multi-internal model compound control strategy is put forward. The vector resonance is used to control frequency adaptability and stability margin. The point realizes the fast tracking control to the fundamental frequency component, The effective tracking control of periodic harmonic signal is realized by using the characteristics of low computation cost of repetitive control. It has the characteristics of high dynamic response speed, high steady-state precision and little calculation. Through modeling and analysis, software programming, hardware design and experimental platform, A three-phase four-wire APF with multi-internal model compound control strategy is realized, and the results of simulation and experiment show that, The three-phase four-wire APF based on the multi-internal model compound control strategy proposed in this paper can effectively solve the problems of current waveform distortion, low power factor and unbalanced load in low-voltage microgrid. It has strong guiding significance for its further engineering application in microgrid.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM761

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