Dynamically self-adaptive load current maximization technique for maximum power point tracking in photovoltaic arrays
A new technique is presented for tracking the maximum power point (MPP) of PV arrays, whose hardware is highly simple with all analog circuits, less sensors and no analog multipliers. A dynamically self-adaptive modulation for Iref is proposed to eliminate inflexibility over characteristics variations of PV arrays, where only converter's output current is sensed for control purpose. The boost converter is regulated in peak-current-programmed DCM conditions by three-loop PWM control, reducing EMI and switching loss. The system is designed with the VIS 0.50µm 5V mixed mode 2P3M process. Results of simulation verify good tracking precision and fast response in both steady and dynamic states, and conversion efficiency is about 86% averagely, and 92% as peak value.