两级式三相光伏并网系统的MPPT控制策略

基于Matlab/Simulink仿真建立了两级式三相光伏并网系统,以研究最大功率点跟踪(MPPT)控制策略.前级DC/DC变换器采用扰动观察法实现MPPT,后级逆变电路采取电压外环、电流内环的双闭环PI控制,以稳定直流母线电压,实现网侧电流的跟踪控制.仿真结果表明,采用的MPPT控制策略具有良好的动态响应性能,且能较好地稳定直流母线电压.;A two-stage three-phase photovoltaic grid-connected simulation system is built based on Matlab/Simulink to study the maximum power point tracking(MPPT)strategy.The DC/DC converter adopts the perturbation method of observation to realize the MPPT control.The DC/AC inverter uses the voltage outer loop and current inner loop of the so-called double closed-loop PI control to stabilize the DC bus voltage and track the grid side current.The simulation results show that the adopted MPPT control method has a good dynamic response and is capable of stabilizing the DC bus voltage