基于DSP控制的双模式逆变系统的研究

Research of Dual Modes Inverter Based on DSP

以往对逆变器的研究侧重于并网模式或独立工作模式,很少涉及两种模式间的切换状态。这里设计并实现了一种能在离网/并网双模式下运行的逆变器。在详细分析逆变系统独立工作和并网运行两种不同运行模式工作原理的基础上,以减小两种模态切换过程中的电压电流冲击为目标,设计了离网/并网逆变器两种模式间的无缝切换方法。系统采用TMS320LF2407A型DSP来设计和实现电压电流模式控制和数字锁相,还具体给出了系统的控制框图和软件设计流程图。仿真和样机实验波形良好,满足要求,验证了所设计方案的可行性。

The past studies of inverters mostly focused on the grid-connect mode or stand-alone mode, rarely involved in the Switch state between this both modes.This paper designs and implements a stand-alone/grid-connect mode inverter.Based on analyzing the principle of stand-alone and grid-connect modes detailedly,for the purpose to reduce the voltage and current impact of switching process,a seamless switch method is designed between both states.The system uses the DSP of TMS320LF2407A to design the mode control of voltage and current, and implements digital PLL.The system control diagram and software flow chart are given.The simulation and prototype experiment show that the waveform of the system is fine, verifying the design is feasible.