Method for tracking solar double-peak maximum power point

Abstract

The invention discloses a method for tracking a solar double-peak maximum power point. The method comprises the following steps of: 1) performing global scanning periodically, if a global scanning time reaches a predetermined time, executing the step 2) to the step 4) in turn, and if the global scanning time does not reach the predetermined time, performing a local MPPT algorithm all the time; 2) defining initial scanning power and setting an initial step length; 3) measuring a current voltage and a current, and calculating current power, wherein the current power is equal to a product of the current and the current voltage; and 4) comparing the current power with last power, and judging power change by disturbing a duty ratio continuously to determine whether the scanning is finished so as to determine a maximum power point. The method has the advantages that: periodic global scanning is added into a common maximum power point tracing algorithm; a scanning time is shortened effectively according to series-parallel characteristics of a solar system so as to ensure the steady operation of the system and avoid that the system works at a secondary maximum power point in a double-peak phenomenon; and therefore, electric energy production is improved.

Description

technical field [0001] The invention relates to a method for tracking the maximum power point in a solar power generation system, in particular to a method for tracking the maximum power point of a solar energy double peak. Background technique [0002] There is no solution to this kind of problem in current products. Only MPPT (maximum power point tracking) tracking without double peak problem is considered, and the interference method and incremental conductance method are generally used to judge and track the maximum power point. With the development of building-integrated photovoltaic power plants, the double-peak problem of solar panels caused by shadows has gradually become prominent, such as figure 1 As shown, the multiple curves in this figure are power curves that gradually change with the increase of the shading amount. It can be seen that two maximum power points gradually appear; when the shadow part covers the solar panel, it may make the system work at Sub-max...

AI Technical Summary

Problems solved by technology

[0003] Purpose of the invention: The purpose of the present invention is to provide a method for tracking the maximum power point of solar energy double peaks, which can solve the problem of avoiding the system working at the sub-maximum power point for a long time when the solar module is covered by the shadow part to form a double peak phenomenon , reduce the maximum power point tracking global scan time, and increase the system power generation

Images