三电平APF的空间矢量滞环控制研究
发布时间：2018-11-01 18:59
【摘要】：随着我国煤矿生产技术的不断发展和对节能减排要求的提高,在煤矿供电系统中,各类非线性负载的使用迅速增加。这类负载的运行会产生大量谐波,不仅影响其他用电设备的正常供电,还会对各种通讯系统、保护系统、监测系统等造成严重的电磁干扰,给煤矿安全生产带来了很大的隐患。所以采取有效措施抑制煤矿电网系统的谐波污染,已经成为煤矿企业发展的迫切要求。有源电力滤波器(APF)的补偿效果好、响应速度快、适应性广,是抑制谐波的有效装置。本文以T型三电平APF为研究对象,着重对三电平滞环控制进行优化。在传统的三电平滞环控制过程中,由于各相分别独立控制而导致功率开关器件存在多余的开关动作。为此,本文在传统的滞环控制中加入空间电压矢量控制,提出了三电平空间矢量滞环控制策略。相比于传统的滞环控制,基于空间矢量滞环控制可以在更小的开关损耗下达到更好的滤波效果,其工作效率更高。在直流侧中点电位平衡控制研究方面,通过实时检测中点电位的偏向?U_c以及中点电流的i_(NP)流动方向,然后对其进行分析判断以实时调整不同的开关组合,最终实现其平衡控制。最后基于Matlab仿真平台以及dSPACE实验平台进行实验验证。具体内容及成果如下:1)论文阐述了煤矿电网中谐波电流产生的原因及其危害,并回顾了滤波器的发展历程,对不同的滤波器进行了分析说明和对比,提出了论文的研究内容。2)阐述说明了T字型三电平APF工作原理、谐波电流的提取方法以及电流的跟踪技术,提出了T字型三电平APF的技术思路和实现途径。3)在分析传统三电平滞环控制方法及其存在的问题基础上,提出了在传统三电平滞环控制中加入空间电压矢量控制的控制思路,在此基础上,构建了空间矢量滞环控制的仿真模型,模型仿真结果表明了论文提出的控制算法的合理性和有效性。4)对三电平APF直流侧中点电位失衡的原因进行了分析,提出通过实时检测中点电位偏向和中点电流方向进而实时调节不同的开关组合的方法,在此基础上,构建了中点电位控制仿真模型,仿真结果表明可以较好的实现中点电位平衡控制。5)论文搭建了基于dSPACE的物理实验平台并进行了相应实验,实验结果验证了本文提出的基于空间矢量的滞环控制策略及中点电位控制方法的正确和有效。
[Abstract]:With the continuous development of coal mine production technology and the improvement of energy saving and emission reduction requirements in coal mine power supply system, the use of all kinds of nonlinear loads is increasing rapidly. The operation of this kind of load will produce a large number of harmonics, which will not only affect the normal power supply of other electric equipments, but also cause serious electromagnetic interference to various communication systems, protection systems and monitoring systems, and bring great hidden trouble to the safety production of coal mines. Therefore, it has become an urgent requirement for the development of coal mining enterprises to take effective measures to restrain harmonic pollution of coal power grid system. Active power filter (APF) is an effective device for harmonic suppression because of its good compensation effect, fast response speed and wide adaptability. This paper focuses on the optimization of three-level hysteresis loop control based on T-type three-level APF. In the traditional three-level hysteresis control process, the power switch device has redundant switching operation due to the independent control of each phase. Therefore, space voltage vector control is added to the traditional hysteresis control, and a three-level space vector hysteresis control strategy is proposed. Compared with the traditional hysteresis control, the hysteresis control based on space vector can achieve better filtering effect at lower switching loss, and its working efficiency is higher. In the research of balance control of midpoint potential on DC side, by detecting the bias of midpoint potential in real time? C and the flow direction of I _ (NP) of midpoint current, and then analyzing and judging it to adjust different switch combinations in real time, Finally, the balance control is realized. Finally, based on Matlab simulation platform and dSPACE experimental platform for experimental verification. The specific contents and achievements are as follows: 1) the paper expounds the cause and harm of harmonic current in coal mine power network, reviews the development course of filter, and analyzes and compares different filters. The research content of this paper is put forward. 2) the principle of T-shaped three-level APF, the method of harmonic current extraction and the current tracking technology are described. This paper puts forward the technical thinking and implementation of T-shaped three-level APF. 3) based on the analysis of the traditional three-level hysteresis control method and its existing problems, In this paper, the control thought of adding space voltage vector control to the traditional three-level hysteresis control is put forward. On this basis, the simulation model of space vector hysteresis control is constructed. The simulation results show that the proposed control algorithm is reasonable and effective. 4) the causes of the imbalance of neutral point potential on the DC side of three-level APF are analyzed. A method of real-time detecting midpoint potential deviation and midpoint current direction and adjusting different switch combinations in real time is proposed. On the basis of this, a simulation model of midpoint potential control is constructed. The simulation results show that the potential balance control at the middle point can be realized well. 5) the physical experiment platform based on dSPACE is built and the corresponding experiments are carried out. The experimental results show that the proposed hysteresis control strategy based on space vector and the midpoint potential control method are correct and effective.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD61
本文编号：2304813
[Abstract]:With the continuous development of coal mine production technology and the improvement of energy saving and emission reduction requirements in coal mine power supply system, the use of all kinds of nonlinear loads is increasing rapidly. The operation of this kind of load will produce a large number of harmonics, which will not only affect the normal power supply of other electric equipments, but also cause serious electromagnetic interference to various communication systems, protection systems and monitoring systems, and bring great hidden trouble to the safety production of coal mines. Therefore, it has become an urgent requirement for the development of coal mining enterprises to take effective measures to restrain harmonic pollution of coal power grid system. Active power filter (APF) is an effective device for harmonic suppression because of its good compensation effect, fast response speed and wide adaptability. This paper focuses on the optimization of three-level hysteresis loop control based on T-type three-level APF. In the traditional three-level hysteresis control process, the power switch device has redundant switching operation due to the independent control of each phase. Therefore, space voltage vector control is added to the traditional hysteresis control, and a three-level space vector hysteresis control strategy is proposed. Compared with the traditional hysteresis control, the hysteresis control based on space vector can achieve better filtering effect at lower switching loss, and its working efficiency is higher. In the research of balance control of midpoint potential on DC side, by detecting the bias of midpoint potential in real time? C and the flow direction of I _ (NP) of midpoint current, and then analyzing and judging it to adjust different switch combinations in real time, Finally, the balance control is realized. Finally, based on Matlab simulation platform and dSPACE experimental platform for experimental verification. The specific contents and achievements are as follows: 1) the paper expounds the cause and harm of harmonic current in coal mine power network, reviews the development course of filter, and analyzes and compares different filters. The research content of this paper is put forward. 2) the principle of T-shaped three-level APF, the method of harmonic current extraction and the current tracking technology are described. This paper puts forward the technical thinking and implementation of T-shaped three-level APF. 3) based on the analysis of the traditional three-level hysteresis control method and its existing problems, In this paper, the control thought of adding space voltage vector control to the traditional three-level hysteresis control is put forward. On this basis, the simulation model of space vector hysteresis control is constructed. The simulation results show that the proposed control algorithm is reasonable and effective. 4) the causes of the imbalance of neutral point potential on the DC side of three-level APF are analyzed. A method of real-time detecting midpoint potential deviation and midpoint current direction and adjusting different switch combinations in real time is proposed. On the basis of this, a simulation model of midpoint potential control is constructed. The simulation results show that the potential balance control at the middle point can be realized well. 5) the physical experiment platform based on dSPACE is built and the corresponding experiments are carried out. The experimental results show that the proposed hysteresis control strategy based on space vector and the midpoint potential control method are correct and effective.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD61
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