Method for tracking solar double-peak maximum power point

A maximum power point, solar energy technology, applied in instruments, adjusting electrical variables, control/regulating systems, etc., to shorten the scanning time, increase power generation, and ensure stable operation.

Inactive Publication Date: 2010-10-27
中电电气(南京)太阳能研究院有限公司
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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

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  • Method for tracking solar double-peak maximum power point
  • Method for tracking solar double-peak maximum power point
  • Method for tracking solar double-peak maximum power point

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[0016] The invention will be further described in detail below in conjunction with the drawings.

[0017] Such as image 3 As shown, a tracking method of solar energy double peak maximum power point of the present invention includes the following steps:

[0018] 1) Perform global scan regularly; if the global scan time reaches the set time, perform steps 2) to 4) in sequence; if the global scan time does not reach the set time, always perform the local MPPT algorithm;

[0019] The local MPPT algorithm is to first measure the current voltage and current when the global sweep time is not up to the set time, and then calculate the current DC power = current voltage * current current, and compare the current DC power and the last DC power To determine the direction and magnitude of the change of the duty cycle D; if the current DC power is greater than the previous DC power, it does not hold true, increase the duty cycle, and then save the larger DC power and the corresponding duty cycl...

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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...

Claims

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Application Information

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IPC IPC(8): H02N6/00G05F1/67
Inventor 王小峰
Owner 中电电气(南京)太阳能研究院有限公司
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