基于数字低通滤波器的双重光伏控制器研究

Study on the Dual PV Controller Based on Digital Low Pass Filter

针对大功率情况下传统光伏控制器存在输入电流纹波、损耗和开关管容量较大的问题,提出基于数字低通滤波器的双重光伏控制器和电流寻优MPPT方法。通过数字低通滤波器的设计,满足了电流寻优MPPT方法的精度要求并减少了电流传感器的使用。Simulink软件的仿真结果验证了基于数字低通滤波器的双重光伏控制器应用于大功率光伏发电系统中的可行性,说明了采用双重拓扑结构将是未来大功率光伏控制器发展方向的观点。

Aiming at the problems of traditional PV controller with large power,e.g.,higher input current ripples,loss and transistor capacity,the dual PV controller based on digital low pass filter and current optimum seeking method of maximum power point tracking（MPPT） are proposed.Through designing digital low pass filter,the precision of the method is satisfied and the quantity of current transducers is reduced.The result of simulation of Simulink software verifies the feasibility of using dual PV controller based on digital low pass filter for large power PV power generation and indicates that dual topology is the developing direction of large power PV controllers in the future.