独立光伏发电系统双向变换器数字控制器设计

Design of Digital Controller for Bi-directional Converter of a Stand-alone Photovoltaic System

提出一种独立光伏蓄电池/超级电容混合储能系统,与传统的独立光伏发电系统相比,新系统具有高功率密度、高能量密度、延长蓄电池的使用寿命、效率高、稳定性好等优点。双向变换器在该系统中承担双向传送能量的任务,对其数字控制系统进行了设计,并采用抗积分饱和控制算法的PID调节器。由于DSP硬件没有移相控制器,提出一种基于移相调节控制的软件方案来实施移相控制。最后通过仿真和实验结果验证了该方案的有效性。

A stand-alone photovoltaic ultracapacitor/battery hybrid energy storage system is proposed.Compared with the traditional one,this system has high power density and high energy density.The system also prolongs the lifetime of battery and achieves the system more efficient and reliable etc.Bi-directional converter implements bi-directional energy transfer in the system.A digital control system for bi-directional DC/DC converter is designed and implemented,and also a PID controller with anti-integral protection.Due to the absence of phase shift controller in adopted DSP hardware,a software based phase shift modulation scheme is developed to implement phase shift control.Finally,the simulation and experimental results show its effectiveness.