级联多电平有源电力滤波器及其容错技术的研究

发布时间：2018-01-09 07:13

本文关键词：级联多电平有源电力滤波器及其容错技术的研究　出处：《辽宁工程技术大学》2014年硕士论文　论文类型：学位论文

【摘要】：由于电力电子设备在煤矿供电网中的大量使用,造成了严重的电能质量问题,尤其是谐波污染问题,严重影响了煤矿供电网的安全。有源电力滤波器APF是目前能有效抑制和补偿谐波的常用措施之一。但随着电网电压等级的提高电力设备日益高压化大功率化,低压中小功率的APF已不能满足当代电力系统的需求,因此对适用于中高压大功率的级联多电平APF的研究具有重要的实际意义。本文主要研究适用于6KV煤矿供电系统的级联多电平APF,着重分析多电平的拓扑结构在有源电力滤波器应用中的优势和不足,提出一种适用于APF的级联多电平变流器结构。对该拓扑结构的容错技术进行研究,主要研究适用于拓扑结构的冗余容错技术,以及级联变流器出现故障的原因和故障处理方法。研究多电平的控制原理,并选择载波移相PWM作为该拓扑的基本控制方法。研究常用谐波检测算法,提出一种基于ip-iq的改进型谐波检测算法,该算法不需要锁相环电路,且具有精度高、实时性强、运算量小等特点。对级联多电平APF直流侧电容电压的控制方法进行研究,提出一种直流侧电容总电压的稳定控制和相内各电容电压的均衡控制控制策略。最后,设计级联多电平APF系统实验样机。仿真实验证明,本文所提出的电网谐波检测算法、多电平变流器拓扑结构及其控制算法能够应用于电力系统谐波补偿,具有一定的现实和工程实现意义。
[Abstract]:Due to the extensive use of power electronic equipment in coal mine power supply network, serious power quality problems, especially harmonic pollution, have been caused. The active power filter (APF) is one of the commonly used measures to suppress and compensate harmonics effectively. However, with the increase of the voltage level of the power network, the power equipment becomes more and more high-voltage and high-power. . Low-voltage and low-power APF can not meet the needs of modern power systems. Therefore, it is of great practical significance to study the cascaded multilevel APF suitable for medium, high voltage and high power. This paper mainly studies the cascaded multilevel APF suitable for 6KV coal mine power supply system. The advantages and disadvantages of multilevel topology in the application of APF are analyzed. A cascaded multilevel converter structure suitable for APF is proposed. The fault-tolerant technology of the topology is studied. This paper mainly studies the redundant fault-tolerant technology suitable for topology, the cause of cascaded converter failure and the fault treatment method, and studies the principle of multilevel control. The carrier phase-shifted PWM is chosen as the basic control method of the topology. The common harmonic detection algorithm is studied and an improved harmonic detection algorithm based on ip-iq is proposed. The algorithm does not need phase-locked loop circuit. It has the characteristics of high precision, high real time, low computation and so on. The control method of cascaded multilevel APF DC side capacitor voltage is studied. This paper presents a stable control strategy for the total voltage of the DC side capacitance and the equalization control strategy for each capacitor voltage in the phase. Finally, an experimental prototype of cascaded multilevel APF system is designed and proved by simulation. The harmonic detection algorithm proposed in this paper, the topology structure of multilevel converter and its control algorithm, can be applied to harmonic compensation of power system, which has practical and engineering significance.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM761

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