基于DSP的并网逆变器的设计  

Design of DSP based grid-connected inverter

作　　者：杨树涛 贺天章 刘俊国 

机构地区：[1]中国洛阳电子装备试验中心,河南孟州454750

出　　处：《现代电子技术》2014年第18期159-162,共4页Modern Electronics Technique

摘　　要：逆变是整流的逆过程,逆变器是将低压直流电转换成交流电的装置。为了能将转换后的交流电送回电网,实现能量再循环,设计了基于DSP的并网逆变器,采用倍频单极性SPWM技术实现逆变控制,并利用DSP外设CAP检测逆变器输出电流频率和相位,以软锁相技术实现逆变器输出电流的相位和频率与电网电压同步;利用DSP外设ADC采集逆变器的输出电流与电网的电压,采用PI闭环调节以增加逆变器输出电流的稳定性,最后搭建实验样机验证设计的可行性。Inverter is an inverse process of rectifier, which convert low-voltage DC to AC. In this paper, a DSP based grid- connected inverter is designed to feed back the converted AC to the power grid to realize the energy recycle. The unipolar SPWM technology is used to realize the inversion control. CAP interface of DSP is utilized to detect the frequency and phase of inverter output current. The software phase-locked technology is taken to achieve the synchronization of inverter output current phase and frequency with the grid voltage. ADC is used to collect the inverter output current and the power grid voltage informa- tion. PI closed-loop control regulation is adopted to enhance the stability of inverter output current. An experimental prototype was designed to verify the technical performance of the grid-connected inverter.

关 键 词：并网逆变器 能量回馈控制 DSP 软锁相 PI闭环调节 

分 类 号：TN710-34[电子电信—电路与系统] TM464[电气工程—电器]