Method for tracking control of maximum output power point of solar cell and tracking device

摘要

Disclosed are a method and device for tracking control of a maximum power point of a solar cell, wherein an output voltage of the solar cell is converted to a voltage required by a load via a conversion module comprising a switching unit. The control method comprises: acquiring an open-circuit voltage of the solar cell (S1); adjusting a duty cycle of the switching unit such that an output voltage of the solar cell decreases from the open-circuit voltage gradually in a first change direction (S2); if the output voltage of the solar cell is less than or equal to a predetermined voltage value, reversely adjusting the duty cycle of the switching unit, wherein the predetermined voltage value is less than the output voltage of the solar cell corresponding to the maximum power of the solar cell (S3); calculating a current output power of the solar cell; and if the current output power is less than a previous output power, determining that the previous output power is the maximum output power of the solar cell (S5). The control method can track the actual maximum power value more easily.