A MAXIMUM POWER POINT TRACKING METHOD BASED ON CURRENT INCREMENT FOR IMPROVING EFFICIENCY OF THE SOLAR INVERTER

摘要

The present invention relates to a method for estimating the maximum power point (MMP) of a current increment for improving efficiency of a solar inverter, which outputs reference voltage to estimate the maximum power point in a photovoltaic power generation system. The method for estimating the maximum power point includes the steps of: (a) receiving input of present voltage and current, calculating a voltage increment and a current increment with respect to previous voltage and previous current, and calculating electric power increment; (b) increasing or decreasing the reference voltage depending on whether the electric power increment is a positive value or a negative value and the voltage increment is a positive value or a negative value if the current increment is a positive value; and (c) increasing or decreasing the reference value depending on whether the electric power increment is a positive value or a negative value if the current increment is a negative value. According to the method for estimating the maximum power point, the maximum power point can be more accurately estimated along an inclined surface of sunlight irradiation by considering the current increment as not only the last increments of current and voltage but also at least three increments are used.