基于数字信号控制器的单相光伏并网逆变电源设计

Design of Single Phase Grid-connected Inverter Based on DSC

基于单相光伏并网系统的拓朴结构和工作原理,设计了以DC-DC升压电路为前级,DC-AC逆变器其后级的并网系统结构。控制部分是基于数字信号控制器dsPIC30F6010的电压电流双闭环跟踪控制策略,并对并网电流闭环控制和并网同步实现进行分析。采用SVPWM算法控制功率器件工作,电导增量法跟踪控制所产生的交流电源,给出相应的程序框图,实现了与电网电压同步的正弦电流输出波形。该实验装置结构简单,控制精度高,输出电流谐波失真小,有较强的实时性。

The design project of diginal single-phase grid-connected inverter based on dsPIC30F6010 is presented according to photovoltaic grid-connected inverter basic principle and topological structure,with front DC-DC ascending voltage circuit and latter DC-AC inverter.Controller is voltage and current double close-loop control strategy based on dsPIC3OF6010,and analysises grid-connected current close-loop control and how to realize synchronously grid.The control system adopts SVPWM algorithm to control the power device and incremental conductance method to track AC power waveform generat- ed,the corresponding program block diagram are also given.