摘要
对前缘、后缘、三角前缘和三角后缘4种调制方式的模拟实现以及数字预测控制算法的原理进行了介绍和比较。通过对模拟和数字两种途径实现的4种调制方式的占空比进行推导,得到了系统给定信号中的扰动对占空比的影响。比较各个占空比表达式中控制到输出占空比的幅频和相频特性,得到了数字实现与模拟实现4种调制方式之间的幅值关系以及相位差。
The introduction and comparison of simulation and digital control principle among four modulations are given.The four modulation include leading-edge,trailing-edge,leading-triangle,the trailing-triangle.The influence on the duty ratio causde by perturbation is deducted through the duty of four modulations realized by modulation and digital.The amplitude relationship and phase difference are achieved by comparing the amplitude frequency and phase frequency characteristic of controlling output duty ratio.
出处
《变流技术与电力牵引》
2008年第3期16-20,29,共6页
Converter Technology & Electric Traction
关键词
数字控制
调制
相位
滞后
digital control
modulation
phase
lag
