文档介绍：基于DSP+FPGA的三电平脉冲形成电路设计
摘要
多电平逆变器一直是当前中高压大容量电能变换领域中的研究热点之一,它通过对直流侧的分压和开关状态的不同组合,实现多电平阶梯波输出电压,能有效地提高逆变器系统容量和耐压水平、减小输出电压谐波和开关损耗。鉴于多电平逆变器多样化的拓扑结构和控制策略,本课题选取目前广泛应用的二极管箝位型三电平逆变器为研究对象,控制策略采用空间矢量脉宽调制的方法。
论文首先介绍了有关多电平逆变器的相关理论,包括多电平逆变器的拓扑结构和控制策略,以及空间矢量脉宽调制技术。
论文深入地研究了三电平逆变器的SVPWM控制策略,介绍了三电平逆变器的两种SVPWM控制策略,一是SVPWM的传统算法,二是SVPWM的简化算法,另外还分析了中点电压不平衡的相关问题。
在此基础上,采用MAILAB仿真软件对所推导的三电平逆变器SVPWM调制算法进行了仿真分析,证明了该调制算法的正确性。
论文对三电平逆变器SVPWM调制实现进行了详细说明,并且就DSP和FPGA组成的组合控制方式进行了说明和验证。
论文的最后对本课题进行了系统的总结,并对下一步工作进行了展望。
关键字: 三电平逆变器; SVPWM; 中点电位不平衡; DSP; FPGA
ABSTRACT
Multi-level inverter has been one of the research focus topics in the field of high-voltage and capacity electrical energy. Through binations of switches, multi-level ladder wave output voltage can effectively improve capacity and voltage pressure levels of inverters, reduce the output voltage harmonic and switching losses. Because there are so many topologies and control strategies of multi-level inverter. The diode clamp-type three-level inverter (NPC) is studied and space-vector PWM is analyzed in this thesis.
Firstly, the relevant theory of multi-level inverter, including the representative topology,modulation strategy are presented in this paper.
This paper concentrates on SVPWM modulation strategy used in three-level inverter. Two SVPWM modulations are introduced,which are the tradition modulation and the simplified algorithm. Then, the problems and their solutions approach about neutral point potential imbalance are presented.
On above basis, the SVPWM modulating means of three-level inverters is simulated by MATLAB,and the correction of modulating means is proved.
The realization on three-level inverter SVPWM modulation strategy is deeply analyzed and DSP-bination means is enumerated.
At the last of this paper, I make a summary of three-level APF and prospect of the next work.
Key Words: three-level inverter; SVPWM; neutral point potential imbalance; DSP; FPGA
目录
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