Patent ID: 9354652
Filing Date: 2016-05-31
CPC Classification: G05F,Y02E

Claim Text:
1. A maximum power point tracking method, for enabling a photovoltaic array to operate at maximum power point, comprising: step a: sampling a present voltage and a present current of the photovoltaic array; step b: obtaining a present power based on the present voltage and the present current sampled at a present sampling time; step c: using a difference between the present power and a power for a previous sampling time as a present perturbation power, and obtaining a present gradient perturbation voltage step ratio based on a ratio of the present perturbation power to a perturbation power for a previous sampling time, wherein the power for the previous sampling time is obtained based on a voltage for the previous sampling time and a current for the previous sampling time which are sampled at the previous sampling time, and the perturbation power for the previous sampling time is a difference between the power for the previous sampling time and a power for a sampling time immediately before the previous sampling time; step d: obtaining a perturbation voltage step based on the present gradient perturbation voltage step ratio and a voltage difference between the present voltage and the voltage for the previous sampling time; and step e: controlling an output voltage of the photovoltaic array based on the perturbation voltage step.