A Method of MPPT Control Based on Power Variable Step-size in Photovoltaic Converter System

摘要

Since the disadvantage of traditional MPPT algorithms of variable step-size, proposed power tracking based on variable step-size with the advantage method of the constant-voltage and the perturb-observe(P&O)~([1-31). The control strategy modify the problem of voltage fluctuation caused by perturb-observe method, at the same time, introducing the advantage of constant-voltage method and simplify the circuit topology. With the theoretical derivation, control the output power of photovoltaic modules to change the duty cycle of main switch. Achieve the maximum power stabilization output, reduce the volatility of energy loss effectively, and improve the inversion efficiency~([3,4]). Given the result of experimental test based theoretical derivation and the curve of MPPT when the prototype work.