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Photovoltaic string power generation efficiency optimization system

A photovoltaic group and efficiency technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problems of lower utilization rate of inverter and transformer equipment, lower inverter conversion efficiency, etc., to improve efficiency and reduce kWh cost and the effect of reducing the scale of new investment

Pending Publication Date: 2021-02-05
SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) The inverter conversion efficiency decreases due to the voltage drop of the photovoltaic string;
[0007] 2) The utilization rate of inverters, transformers and other equipment is reduced due to the reduction of photovoltaic power generation capacity after the voltage of photovoltaic strings drops

Method used

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  • Photovoltaic string power generation efficiency optimization system

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Embodiment Construction

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0027] Such as figure 1 As shown, a photovoltaic string power generation efficiency optimization system, the system is connected to the AC power grid 5, the system includes N groups of photovoltaic strings 1, DC microgrid 2 with the same number as the photovoltaic strings, combiner box 3 and inverter Each group of photovoltaic strings 1 is connected to the corresponding DC microgrid 2, all the DC microgrids 2 are connected to the combiner box 3, and the co...

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Abstract

The invention relates to a photovoltaic string power generation efficiency optimization system, which is connected with an alternating-current power grid, and comprises at least one group of photovoltaic strings, direct-current micro-grids, combiner boxes and inverters; the number of the direct-current micro-grids is the same as that of the photovoltaic strings, and each group of photovoltaic strings is connected with the corresponding direct-current micro-grid. All the direct-current micro-grids are connected with a combiner box, the combiner box is connected with an inverter, and the inverter is connected with an alternating-current grid; and the output voltage of the photovoltaic string is kept constant at a set level by using the direct-current microgrid connected in series in the photovoltaic string. Compared with the prior art, the method has the advantages of greatly improving the space comprehensive utilization rate of the photovoltaic power station and the like.

Description

technical field [0001] The present invention relates to photovoltaic power generation, in particular to a photovoltaic string power generation efficiency optimization system. Background technique [0002] Photovoltaic power generation systems are generally used by connecting photovoltaic modules in series to form photovoltaic strings, with high DC voltage, large capacity, and high conversion efficiency. After the photovoltaic module is put into operation, the working voltage will decrease due to various reasons such as aging and PID. Some reasons can be recovered by taking measures, and some reasons are irreversible. Generally speaking, the voltage of the photovoltaic string will show a downward trend as the operation time increases. The drop in photovoltaic string voltage, on the one hand, makes the inverter unable to work at the rated voltage level and reduces the conversion efficiency; on the other hand, the photovoltaic power generation capacity decreases, and the utili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/381H02J2300/22Y02E10/56
Inventor 张健夏杰费章胜江继波冯波张翼董昕昕
Owner SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG
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