单DSP三电平控制策略  

Study of Applying Three-Level PWM Strategy on Single-DSP Architecture

作　　者：蔡凯[1] 程善美[1] 李自成[2] 

机构地区：[1]华中科技大学控制科学与工程系,武汉430074 [2]武汉工程大学电气信息学院,武汉430073

出　　处：《电工技术学报》2009年第7期120-124,共5页Transactions of China Electrotechnical Society

摘　　要：相对传统的二电平系统多电平系统具有电压变化率(dV/dt)低、谐波畸变率(THD)低和器件承受电压低等优点,三电平系统是其中最具工程价值的典型方案。三电平硬件平台一般采用经典的"DSP+CPLD"架构,三电平控制策略中由DSP完成三电平算法部分,由CPLD完成PWM信号扩展分配部分。本文重新分析了三电平控制策略的模块层次,并结合典型的DSP硬件系统结构,提出了在以单DSP为核心的硬件架构上实现三电平控制策略的方案。硬件平台的实验结果证明了该方案的可行性,该方案在系统紧凑性、可靠性和成本上具有一定的优势。Multi-level converters are provided with extremely lower dVIdt, very low harmonic distortion, and low device＇s voltage stress. As one of multi-level converters with general applications, three-level converter usually works in the ＂DSP＋CPLD＂ hardware architecture, in which DSP completes the three-level algorithm, and CPLD implements the PWM extension task. A novel three level scheme with only one single DSP is put forward based on analysing on algorithm modularity and hardware properties. Results of experiments on two types of hardware platform testify the feasibility of this scheme, and it exhibits good characters of high compact structure, dependability, as well as low cost.

关 键 词：三电平 PWM扩展 单DSP系统 双EV联合模式 

分 类 号：TP202[自动化与计算机技术—检测技术与自动化装置]