Multi-mode power point tracking

摘要

A method for tracking a power point for a power source includes calculating voltage and current errors for the power source, selecting either the voltage error or the current error, and controlling the power converter with a first control loop in response to the selected error. The voltage and current errors may be calculated in response to voltage and current targets, respectively, which may be calculated by a second control loop that implements an MPPT algorithm. The second control loop may calculate the voltage and current targets in response to which error the first control loop selects. A method for tracking a power point for a power source having multiple local power maxima includes measuring the individual voltage across one or more series-connected power elements in the power source, and controlling the power in response to the overall voltage and current as well as the individual voltage.

主权项

1. A method for tracking a maximum power point for a power source coupled to a power converter, the method comprising:
measuring the output voltage and current of the power source; determining a current step in response to the output voltage and current of the power source; determining a voltage step in response to the output voltage and current of the power source; and controlling the power converter in response to both the voltage step and current step concurrently,
wherein controlling the power converter in response to both the voltage step and current step concurrently includes selecting a voltage mode or current mode for controlling the power converter.