三相并网光伏发电系统的双模控制实现

摘要

依据三相逆变器光伏并网系统高性能与设备成本间的问题,提出了极点配置与重复控制相结合的并网控制方案,检测直流环节的电流就可以达到对光伏电池阵列的最大输出功率检测,减少了检测系统成本,增加了跟踪速度.基于加强逆变器直流电压利用率,采用了三次谐波的调制策略.采用直流升压的两级控制方法可以提高逆变器性能,能够达到电流内环对并网电流精确控制.仿真和实验结论验证了方法的正确性和有效性.%According to the problem of high performance and equipment cost of PV system in three-phase inverter,a grid-connected control scheme combining pole configuration and repetitive control was proposed,and the maximum output power of the PV cell array can be detected by detecting the current in the DC link Detection,reduced detection system costs,increased tracking speed.Based on the enhancement of the inverter DC voltage utilization,the third harmonic modulation strategy was adopted,and the use of DC boost two-stage control method can improve the inverter performance,to achieve the current loop on the grid current precise control.Simulation and experimental results verified the correctness and validity of the method.