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Photovoltaic array variable structure control method capable of increasing electric energy production of photovoltaic power generation system

A photovoltaic power generation system and variable structure control technology, applied in photovoltaic power generation, photovoltaic modules, electrical components, etc., can solve problems such as waste of power generation, and achieve the effect of increasing power generation

Inactive Publication Date: 2016-07-27
XIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a photovoltaic array variable structure control method for improving the power generation capacity of the photovoltaic power generation system, which solves the problem of waste of power generation capacity of the existing photovoltaic array when the intensity of sunlight is weak

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  • Photovoltaic array variable structure control method capable of increasing electric energy production of photovoltaic power generation system

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[0024] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] The present invention is a photovoltaic array variable structure control method for improving the power generation capacity of a photovoltaic power generation system. The photovoltaic array variable structure (hereinafter referred to as the total photovoltaic array) adopted is as follows: figure 1 As shown, 2N identical photovoltaic branches are included in the combiner box, and they are divided into two groups of equal numbers. The photovoltaic branches 1, 2, ..., N are the first group, and the photovoltaic branches 1, 2, ... The positive poles of ... and N are all connected to the positive poles of the bus terminals, and the negative poles of photovoltaic branches 1, 2, ..., N are all connected to the negative poles of the bus terminals to obtain sub-photovoltaic array a; photovoltaic branches N+1, N+2 , ..., 2N is the second group, ...

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Abstract

The invention discloses a photovoltaic array variable structure control method capable of increasing electric energy production of a photovoltaic power generation system. When the voltages at the two ends of a general photovoltaic array are higher than the voltage required by grid connection, a corresponding control switch enables two groups of sub photovoltaic arrays to be connected in parallel for supplying power to a photovoltaic inverter; and when the voltages at the two ends of a general photovoltaic array are lower than the voltage required by grid connection, the corresponding control switch enables the two groups of sub photovoltaic arrays to be connected in series for supplying power to the photovoltaic inverter. According to the photovoltaic array variable structure control method, a group of control switches are adopted in a combiner box; the series-parallel connection modes of the photovoltaic arrays are automatically changed according to the magnitudes of the output voltages of the photovoltaic array, so that it is ensured that the photovoltaic inverter can be connected to the power grid to realize power generation even if the illuminance intensity is relatively low; and the purpose of increasing the electric energy production of the photovoltaic power generation system is fulfilled as well.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation applications, and in particular relates to a photovoltaic array variable structure control method for increasing power generation of a photovoltaic power generation system. Background technique [0002] It is especially suitable for large-scale installation of photovoltaic arrays in open hills, Gobi, deserts and other places to form photovoltaic grid-connected power stations. When the intensity of sunlight is strong, the output voltage of the photovoltaic array is high, which meets the grid-connected conditions, and the photovoltaic grid-connected inverter can provide electricity to the grid; when the intensity of sunlight is weak, the output voltage of the photovoltaic array is low. If the voltage is lower than the grid-connected power generation voltage condition, the photovoltaic grid-connected inverter will stop working. Even if the photovoltaic array can output a certain...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/36H02J3/38
CPCH02J3/383H02S40/36Y02E10/56
Inventor 孙向东关晓亚任碧莹张琦安少亮
Owner XIAN UNIV OF TECH
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