Comparison and its simulation of centralized and distributed MPPT structure

The models of PV arrays with centralized maximum power point tracking (MPPT) and distributed MPPT structures were set up and output characteristics of PV arrays were simulated under different light intensity. The maximum power output of PV arrays is reduced to 40W from 85W for centralized MPPT structure when simulating solar light intensity of one of PV arrays is adjusted to 800 W/m² from 1200 W/m². However, the power output of PV arrays is not obviously decreased with sunlight intensity changed from 1200 W/m² to 800 W/m² in the distributed MPPT structure. The results indicate that the power output of distributed MPPT is superior to that of centralized MPPT under shade situation. However, the response time of PV arrays with distributed MPPT is 0.08 second to reach a stable state, which is longer than response time (0.005 seconds) of centralized MPPT.