改进重复控制技术在光伏并网逆变器中的应用

摘要

基于LCL滤波器的并网VSI系统，在重复控制理论基础上进行改进，提出一种具有频率波动适应能力的控制策略，保证当电网频率波动时依然具有良好的电流跟踪性能。同时系统具有低谐波及高功率因数的优越性能。通过Matlab/Simulink仿真验证了该控制策略的正确性和有效性。%LCL filter-based grid connected VSI will be improved on the basis of repetitive control A new control strate-gy with the capacity to adapt to the frequency fluctuation is presented in this paper, which will ensure a good current tracking performance in condition of grid frequency fluctuation. Moreover, the proposed system has the advantages in low harmonic and high power factor. Simulation results based on matlab/simulink verify the correctness and effective-ness of the proposed control strategy.