基于重复和PI控制的光伏离网逆变器的研究

针对传统PI控制无法实现无静差跟踪的缺点,提出了一种重复控制与PI控制相结合的单相光伏离网逆变器复合控制方案。基于内模原理的重复PI控制策略,具有很好的鲁棒性,对于消除非线性负载及其他周期性干扰引起的波形畸变具有明显的效果。为验证提出的算法,构建了基于DSP IC30F6010的光伏单相逆变系统实验模型,并且建立Matlab仿真模型,实验和仿真结果都表明,提出的算法能够减少逆变输出电流谐波,同时系统兼顾了良好的动静态性能。

Research on Photovoltaic Off-grid Inverter Based on Repetitive Control and PI Control

Aiming at solving the disadvantages that traditional PI control can not realize tracking without steady-state error,a synthesized control scheme combined repetitive control with PI control for a single-phase photovoltaic off-grid inverter is introduced.The repetitive control strategy based on internal model theory combined with PI control strategy has good robustness and has clear effect to eliminate waveform distortion caused by nonlinear load and other periodic interference.Simulation and experimental prototypes for a single-phase off-grid inverter controlled by DSP IC30F6010 are presented to verify the performance of the proposed control approach.The results prove that the harmonic in the inverter’s output current can be effectively eliminated as well as the system can achieve good steady-state and dy-namic performance with the synthesized control approach.