Maximum power point tracking control method for photovoltaic inverter

Abstract

The invention discloses a maximum power point tracking control method for a photovoltaic inverter. The method includes the steps: S1, allowing the voltage of a solar panel to be periodically disturbed in a fixed direction at a large step V_step_big from an open-circuit voltage point oc to a short-circuit point o, and recording power Ppv and operating voltage Vpv in each disturbance; S2, when MPPT (maximum power point tracking) minimum voltage V_min is disturbed, finishing the fixed-direction disturbance, finding out the maximum value Ppv_max of all the recorded power Ppv during disturbance from the point oc to the point V_min and the corresponding voltage value Vpv_max; S3, periodically disturbing at a small step V_step_small with the Vpv_max serving as an initial point to perform maximum power point tracking; and S4, as for the single-way MPPT, judging whether the operating voltage of the solar panel is smaller than the operating voltage of a bus or not in a scanning or searching state. The maximum power point tracking control method integrates MPPT tracking speed and tracking precision, two-way MPPT can be performed at the same time, and the method is applicable to mounting conditions of various solar panels.

Description

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AI Technical Summary

Benefits of technology

The technical effect of this patented technology allows for faster trackability by adjusting an average value called PV_C (power-point) voltage based on its peak or minimum energy level during each sweep period. This helps reduce errors caused when searching over different terrains at varying levels of brightness due to changes in solar intensity.

Problems solved by technology

Technological Problem addressed in this patents relates to optimizing peak performance of certain types of photoelectric converters used in electric vehicles or other applications where they operate under extreme conditions. Current methods have limitations including slow response times and insufficient resolution capabilities.

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