光伏发电系统中双环电流模式Boost变换器的研究

在光伏发电系统中,前级Boost升压变换器采用单环电压模式控制时,动态响应速度慢,系统的稳定性差,针对上述问题,利用UC3842设计了双环电流模式控制系统、内部电流环和外部电压环。先对内部电流环进行斜坡补偿,然后推导控制系统的开环传递函数,根据其开环频率特性对外部电压环进行PI调节,提高系统的动态响应速度和稳定性。试验结果与理论分析一致,证明了双环电流模式控制系统具有动态响应速度快和稳定性好等优点,控制效果较好。

Study on Boost Converter with Double-Loop Current Mode Control in Photovoltaic Power Gemeration System

In photovoltaic power generation system,when the Boost converter is designed using a single-loop voltage mode control,it responses slowly and has poor stability.To solve the problem,a double-loop current mode control system was designed using UC3842,the internal current loop and external voltage loop as well.In order to improve the dynamic response speed and stability of the system,the internal current loop was compensated with slope,and then the open-loop transfer function of the system was discussed.Accor...