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Scanning method for tracing maximal power point of solar energy photovoltaic panel

A solar photovoltaic panel and maximum power point technology, applied in the field of solar photovoltaic panels, can solve the problems of inaccurate tracking of the maximum power point, failure, easy failure, etc., to prevent the system from being limited in measurement accuracy, reducing energy loss, and preventing tracking failure. Effect

Active Publication Date: 2010-06-02
EMERSON NETWORK POWER CO LTD
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Problems solved by technology

[0017] The further technical problem to be solved by the present invention is to prevent inaccurate or easy failure of maximum power point tracking caused by changes in environmental conditions or limited system measurement accuracy under normal weather, and to prevent tracking failure caused by abnormal weather changes

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  • Scanning method for tracing maximal power point of solar energy photovoltaic panel

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Embodiment Construction

[0033] According to the optimization method of single-peak index function in mathematics, the present invention illustrates a method for finding the maximum point of the fastest single-peak index function. Such as figure 1As shown, it is the solar photovoltaic power voltage characteristic curve, the horizontal axis corresponds to the solar photovoltaic input voltage, and the vertical axis corresponds to the solar photovoltaic input power. It can be seen from the figure that under certain light intensity conditions, the solar photovoltaic power-voltage characteristic curve is a single-peak index function, that is, there is only one maximum point within a certain range, so the optimization method of the mathematical single-peak index function can be used to design an optimal A quick way to find the maximum power point.

[0034] The first step is to determine the maximum voltage range that needs to be scanned. The scanning range may be the full voltage range, or a scanning rang...

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Abstract

The invention discloses a scanning method for searching a maximal power point of a solar energy photovoltaic panel, which comprises the following steps of: (1) determining a power region needing scanning according to a solar energy photovoltaic power and voltage characteristic curve and determining a voltage range (A-B) needing scanning according to the power region; (2) determining two golden partition points (X1and X2) in the voltage range (A-B) needing scanning and calculating practical powers corresponding to the two golden partition points; (3) determining the voltage range of next scanning; (4) determining a new golden partition point in anew scanning voltage range, calculating the power corresponding to the new golden partition point and turning to the step (3), and repeating such the process till the maximal power point is found out; and (5) after the maximal power point is found out, tracing the maximal power point. The method can find out the maximal power point in short time and reduce energy loss.

Description

technical field [0001] The invention belongs to solar photovoltaic panels, in particular to a scanning and tracking method for the maximum power point of a solar photovoltaic panel. Background technique [0002] At present, there are many algorithms for solar maximum power point tracking (MPPT) commonly used in the industry, such as constant voltage method (or open circuit voltage method), short-circuit current method, disturbance observation method, admittance increment method ( Admittance incremental method), variable step admittance incremental method or variable step size disturbance observation method, scanning method (an improved method of disturbance observation method), and some algorithms are based on these algorithms The improvement of the algorithm, or the shortcomings of the algorithm to solve some practical problems such as partial shadows, light intensity, etc. The control and algorithm of the constant voltage method and the short-circuit current method are si...

Claims

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Application Information

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IPC IPC(8): H02N6/00G01J1/42H02S20/32
CPCY02E10/58Y02E10/56
Inventor 吴连日
Owner EMERSON NETWORK POWER CO LTD
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