五相矩阵变换器的研究

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3.0 高德中 2024-11-19 8 4 2.36MB 80 页 15积分
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摘　要
矩阵变换器（Matrix Converter, MC）具有拓扑结构简单，结构紧凑，能量可
双向流通，可产生正弦输入电流和输出电压，输入功率角可调等优点，成为近年
来电能转换技术的研究热点。但传统矩阵变换器（Conventional Matrix Converter,
CMC）存在着换流和控制策略比较复杂等问题，使得 MC 难于得到广泛的应用。
双级矩阵变换器（Two-stage Matrix Converter, TSMC）是在 CMC 基础上发展起来
的一种新型的矩阵变换器。TSMC 不仅在性能上与 CMC 无异，而且克服了 CMC
的换流过程复杂的问题，使输入侧能够实现软开关换流，因而成为 MC 发展的主
流方向。
本文提出一种新型的五相 TSMC，该变换器采用改进的双级拓扑结构，实现
了三相输入、五相输出的直接功率变换。五相 TSMC 同样具有三相 TSMC 的优点：
如采用更少的主电路开关管，开关管更容易换流，换流策略和调制控制更简单等
等。另外，本文提出的变换器主要应用到五相异步电机的拖动系统，采用多相异
步电机拖动的系统比传统的三相异步电机拖动系统具备以下一些优点：如可以在
断相的非正常运行状态下运行；与三相 TSMC 相比，五相 TSMC 具有更小的输入
电流波动，从而不必使用多个三相负载减小 TSMC 输入电流波动。
本文第一章主要探讨了当前矩阵变换器的研究进展情况、课题的研究目的和
方向；第二章介绍三相 MC 目前主要研究进展情况和几种主要的控制算法，并对
三相空间矢量调制方法进行了较详细的论述；第三章对五相 TSMC 进行了深入的
研究，通过采用改进的五相 park 变换，对五相空间矢量调制技术进行了优化，并
相应地对各控制策略进行了仿真验证。
针对实际电网电压经常出现不对称的情况，本文第四章对电网电压不平衡对
五相 TSMC 的影响进行了详细的分析，并提出了改进的方法：作者首先建立五相
TSMC 空间矢量调制下的数学模型，然后分析了电网电压存在负序电压时，对输
出电压与输入电流的影响，最后提出了消除电网不平衡造成输出电压和输入电流
存在二次谐波的方法。
为使得五相 TSMC 能更好更稳定地运行，本文第五章详细地探讨了该变换器
主电路开关管换流的问题，第六章对本变换器的输入侧滤波电路参数选择问题进
行了探讨。
本文通过深入探讨三相 TSMC 控制算法，在此基础上将相关理论推广应用到
五相 MC 的实现，并根据推广改进的五相 park 变换，提出了五相空间矢量调制的
优化技术。经仿真验证，本文提出的相关理论和控制算法切实可行，为后续多相
大容量电机调速系统的矩阵变换器实现进行了有益的探索。
关键词：双级矩阵变换器 五相 不平衡 空间矢量
ABSTRACT
Matrix Converter (MC) has many advantages such as simple topology, bi-
directional power flowing, adjustable input power factor, etc. Therefore, MC research
has become a hot topic in power conversion technology in recent years. However,
conventional Matrix converter has complex control strategy and commutation problems,
which makes MC difficult to be widely used. Two-stage matrix converter (TSMC) is a
new type of matrix converter, which is developed on the basis of CMC. TSMC
becoming the mainstream of MC research because it not only have the same
performances as CMC, but also overcome the problem of the complex commutation of
CMC, and for the input stage the soft switching is realized.
In this thesis, with an improved two-stage topology, a new type of five-phase two-
stage matrix converter is presented, for which a three phase to five-phase direct power
conversion can be complemented.
Five-phase TSMC has the same advantages as three-phase TSMC, such as less
switches, more convenient commutation, simpler commutation and control strategy, etc.
In addition, the matrix converter presented in this thesis is mainly used in five-phase
induction machine drive system. Compared with three-phase induction machine drive
system, multi-phase induction machine drive system has advantage of being operated at
phase opening. Compared with three-phase TSMC, five-phase TSMC has much smaller
high frequency input current ripple, thus eliminating the need to use more three-phase
loads to decrease TSMC current ripple.
Chapter one mainly discusses the recent progress of matrix converter research, the
purpose and direction of this search; chapter two introduces three-phase MC research
progress and several main control algorithms, at the same time three-phase space vector
modulation method is described in detail; in chapter three deep investigation on five-
phase TSMC has been completed, and with the improved five-phase park conversion,
five-phase space vector modulation technology has been developed, and simulations are
proceeded to verify various control strategies.
In reality, the power grid voltages are always unbalanced. Chapter four analyzes
the influence of unbalanced power grid voltages on the five-phase TSMC, and proposes
the improved method. At first, the mathematical model of five-phase TSMC space
vector modulation is established, and then the influence of negative sequence voltages
on output voltages and input currents has been analyzed. Finally, the method which may
eliminate the second order harmonic in output voltages and input currents is proposed.
In order to make five-phase TSMC operate better and more stable, chapter five
discusses the commutation method of this converter, in chapter six the parameters of
input filter circuit have been investigated.
In this thesis，three-phase TSMC control algorithm is studied, and such of the five
phase MC based on improved five phase park conversion is extended. The five phase
space vector modulation optimization technique is presented. The simulation results
show that the theory and control algorithm presented in this thesis is feasible. This is a
useful exploration in multi-phase large capacity induction machine speed control system
matrix converter.
Key Words: Two Stage Matrix Converter, Five phase,
Unbalance，Space Vector.
目 录
摘要
ABSTRACT
第一章　绪论.........................................................................................................................................1
1.1 选题来源及课题意义..............................................................................................................1
1.2 矩阵变换器的发展历史及现状..............................................................................................2
1.3 矩阵变换器近期取得的进展..................................................................................................4
1.4 本文的主要研究内容..............................................................................................................4
第二章　三相矩阵变换器研究............................................................................................................6
2.1 三相矩阵变换器的拓扑结构..................................................................................................6
2.2 三相矩阵变换器的典型控制策略..........................................................................................6
2.3 空间矢量调制策略的矩阵变换器..........................................................................................8
2.3.1 坐标轴变换...................................................................................................................8
2.3.2 矩阵变换器拓扑结构分析.........................................................................................10
2.3.3 三相矩阵变换器的空间矢量调制.............................................................................13
2.3.2.1 逆变电路空间矢量变换..........................................................................................13
2.3.2.2 整流电路空间矢量变换..........................................................................................15
2.3.2.3 实际的矩阵变换器空间矢量法..............................................................................15
2.4 本章小结.................................................................................................................................16
第三章　五相矩阵变换器的研究......................................................................................................18
3.1 五相双级矩阵变换器与五相单级矩阵变换器的比较........................................................18
3.2 五相双级矩阵变换器的几种拓扑结构................................................................................18
3.3 五相双极矩阵变换器的调制策略........................................................................................20
3.3.1 五相矩阵变换器整流侧线线换流法.........................................................................20
3.3.2 五相矩阵变换器逆变侧换流方法.............................................................................21
3.3.3 五相双级矩阵变换器换流同步.................................................................................25
3.4 五相双极矩阵变换器的电压传输比计算............................................................................26
3.5 五相双极矩阵变换器的输出调制策略的改进....................................................................28
3.5.1 输出侧减少换流次数的方法.....................................................................................28
3.5.2 采用广义park 变换的五相双级矩阵变换器............................................................29
3.5.2 采用广义park 变换的五相双级矩阵变换器的仿真结果........................................32
3.6 本章小结.................................................................................................................................35
第四章　五相双级矩阵变换器输入不对称分析..............................................................................36
4.1 电压或电流波形质量的定义................................................................................................36
4.2 不对称输入的研究现状........................................................................................................36
4.3 空间矢量状况下输入不对称对五相双级矩阵变换器输出的影响....................................37
4.3.1 整流侧空间矢量调制.................................................................................................37
4.3.2 逆变侧空间矢量调制.................................................................................................38
4.3.3 双级矩阵变换器的空间矢量调制.............................................................................39
4.4 不对称输入电压对输出的影响............................................................................................40
4.4.1 不对称输入电压对虚拟整流输出电压的影响.........................................................40
4.4.2 不对称输入电压对五相输出电压的影响.................................................................40
4.5 不对称输入电压对输入电流的影响....................................................................................41
4.5.1 五相线电流与相电流的关系.....................................................................................41
4.5.2 不对称输入电压对输入电流的影响.........................................................................42
4.6 消除电压不对称影响的方法................................................................................................43
4.6.1 谐波注入法.................................................................................................................43
4.6.2 负序谐波分量的占空比实现.....................................................................................44
4.7 本章小结.................................................................................................................................44
第五章　五相双级矩阵变换器的换流分析......................................................................................45
5.1 双级矩阵变换器的换流技术................................................................................................45
5.2 死区换流技术........................................................................................................................45
5.3 五相双级矩阵变换器的换流技术........................................................................................46
5.4 本章小结.................................................................................................................................48
第六章　输入滤波电路性能分析......................................................................................................49
6.1 LC 滤波电路设计...................................................................................................................49
6.2 输入滤波器的相移补偿........................................................................................................50
6.3 RLC 滤波电路设计................................................................................................................51
6.3.1 输入滤波器稳态数学分析.........................................................................................52
6.3.2 目标函数描述.............................................................................................................53
6.4 实验分析.................................................................................................................................55
6.5 本章小结.................................................................................................................................55
第七章　结论与展望..........................................................................................................................56
§7.1 结论.......................................................................................................................................56
§7.2 展望.......................................................................................................................................57
附录 1....................................................................................................................................................58
附录 2....................................................................................................................................................62
参考文献...............................................................................................................................................66
摘要：

摘　要矩阵变换器（MatrixConverter,MC）具有拓扑结构简单，结构紧凑，能量可双向流通，可产生正弦输入电流和输出电压，输入功率角可调等优点，成为近年来电能转换技术的研究热点。但传统矩阵变换器（ConventionalMatrixConverter,CMC）存在着换流和控制策略比较复杂等问题，使得MC难于得到广泛的应用。双级矩阵变换器（Two-stageMatrixConverter,TSMC）是在CMC基础上发展起来的一种新型的矩阵变换器。TSMC不仅在性能上与CMC无异，而且克服了CMC的换流过程复杂的问题，使输入侧能够实现软开关换流，因而成为MC发展的主流方向。本文提出一种新型...

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作者：高德中 分类：高等教育资料 价格：15积分 属性：80 页 大小：2.36MB 格式：DOC 时间：2024-11-19

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