基于单周控制的单相并网逆变器仿真分析

Simulation analysis of single-phase grid inverter based on one-cycle control

为研究太阳能光伏发电单相并网问题,将单周控制技术应用到并网逆变器中。在开关周期内利用单周控制原理对每个开关管进行了精确控制,基于该方法实现了正弦脉宽调制,其控制电路简单,动态控制响应快。利用M atlab/S imu link软件对该并网逆变器进行了建模仿真实验,实验结果显示逆变器输出波形THD小,对"孤岛"效应反应迅速。研究结果表明该方法实现单相并网技术简单,为居民用户光伏发电并网提供了新的途径。

For the study of solar photovoltaic power generation on single-phase grid problem,one cycle control was applied to the grid inverter.One cycle control theory was used to control each switch precisely in every switching.Based on this method,the sinusoidal pulse width modulation was realized,the control circuit is simple and it has fast dynamic control response.Matlab/Simulink software was used to establish simulative model of grid inverter.The experimental results show that the output wave＇s THD of grid inverter is very small,and this inverter could rapidly respond ＂single island＂ affect.The results show that using this method to realize single-phase grid technology is simple,and it provides a method for photovoltaic to power generation grid of residential customers.