CN-122026470-A - Photovoltaic module level power generation system

CN122026470ACN 122026470 ACN122026470 ACN 122026470ACN-122026470-A

Abstract

The invention discloses a photovoltaic module-level power generation system. The system comprises a plurality of photovoltaic group strings, group string level power optimizers, a converging module and an inverting module, wherein the photovoltaic group strings comprise at least two component level power optimizers, the input ends of the component level power optimizers are coupled with a photovoltaic component, the output ends of the component level power optimizers are connected in series and then output, part of the photovoltaic group strings are coupled with the inverting module through the group string level power optimizers which are arranged in one-to-one correspondence with the photovoltaic group strings, and part of the photovoltaic group strings are coupled with the inverting module through the shared converging module. The photovoltaic module-level power generation system can achieve power generation efficiency, cost and flexibility in installation.

Inventors

ZHANG YONG
LI MENG
GU ZAIXUE

Assignees

丰郅(上海)新能源科技有限公司

Dates

Publication Date: 20260512
Application Date: 20241107

Claims (10)

1. A photovoltaic module-level power generation system, comprising: A plurality of photovoltaic string comprising at least two component level power optimizers; the input end of each component level power optimizer is coupled with the photovoltaic component, and the output end of each component level power optimizer is connected in series and then output; The photovoltaic power generation system comprises a group string power optimizer, a converging module and an inversion module, wherein part of the photovoltaic group string is coupled with the inversion module through the group string power optimizer which is arranged in one-to-one correspondence with the photovoltaic group string, and part of the photovoltaic group string is coupled with the inversion module through the shared converging module.
2. The photovoltaic module-level power generation system of claim 1, wherein the photovoltaic string coupled to the string-level power optimizer is a first photovoltaic string and the photovoltaic string coupled to the bus module is a second photovoltaic string; Wherein the number of first photovoltaic strings is less than the number of second photovoltaic strings.
3. The photovoltaic module-level power generation system of claim 2, wherein the number of first photovoltaic strings is one string and the number of second photovoltaic strings is multiple strings.
4. A photovoltaic module-level power generation system according to any one of claims 1-3, wherein the photovoltaic string coupled to the string-level power optimizer is a first photovoltaic string and the photovoltaic string coupled to the bus module is a second photovoltaic string; the length of the first photovoltaic group string is smaller than that of the second photovoltaic group string, and the difference value of the lengths of the second photovoltaic group strings is smaller than a set threshold value.
5. A photovoltaic module-level power generation system according to any one of claims 1-3, wherein the photovoltaic string coupled to the string-level power optimizer is a first photovoltaic string and the photovoltaic string coupled to the bus module is a second photovoltaic string; The illumination time of the first photovoltaic group string is smaller than that of the second photovoltaic group string.
6. The photovoltaic module-level power generation system of claim 1, wherein the photovoltaic string coupled with the bus module is a second photovoltaic string; the second photovoltaic group string also comprises a protection unit, wherein the protection unit is connected in series between the output end of the second photovoltaic group string and the confluence module.
7. The photovoltaic module-level power generation system of claim 6, wherein the protection unit comprises at least one of an anti-reflection diode, a fuse, and a protection switch.
8. The photovoltaic module-level power generation system of claim 1, wherein the module-level power optimizer corresponds to the photovoltaic module comprising at least one of: the assembly level power optimizer is coupled with one of the photovoltaic assemblies; the module level power optimizer is coupled with at least two of the photovoltaic modules.
9. The photovoltaic module-level power generation system of claim 1, wherein the connection bus of the set of string-level power optimizers, the bus module, and the inverter module is a dc bus; the photovoltaic module-level power generation system further comprises a direct current load and/or a direct current power supply, wherein the direct current load is coupled with the direct current bus, and the direct current power supply is coupled with the direct current bus.
10. The photovoltaic module-level power generation system of claim 9, wherein the dc load comprises at least one of an energy storage battery and a charging stake.

Description

Photovoltaic module level power generation system Technical Field The invention relates to the technical field of photovoltaics, in particular to a photovoltaic module-level power generation system. Background With the continuous development of photovoltaic technology, photovoltaic power generation systems are increasingly widely used, for example, the photovoltaic power generation systems can be arranged in places with rich illumination resources such as deserts, mountains, water surfaces, roofs and the like. In the prior art, photovoltaic power generation systems are roughly classified into concentrated inverter power generation (single-stage inverter), string inverter power generation, component-level power optimizer+inverter power generation, and the like. The power generation of the component-level power optimizer and the inverter has the advantages of high power generation quantity and good safety, and gradually becomes a trend of a distributed roof photovoltaic power generation system. However, in the prior art, when photovoltaic power generation is performed by using a module-level power optimizer and an inverter, flexibility of installation is sacrificed if power generation efficiency and cost are to be ensured, and power generation efficiency is reduced and cost is increased if flexibility of installation is to be ensured. Disclosure of Invention The invention provides a photovoltaic module-level power generation system, which is used for considering power generation efficiency, cost and installation flexibility. This photovoltaic module level power generation system includes: A plurality of photovoltaic string comprising at least two component level power optimizers; the input end of each component level power optimizer is coupled with the photovoltaic component, and the output end of each component level power optimizer is connected in series and then output; The photovoltaic power generation system comprises a group string power optimizer, a converging module and an inversion module, wherein part of the photovoltaic group string is coupled with the inversion module through the group string power optimizer which is arranged in one-to-one correspondence with the photovoltaic group string, and part of the photovoltaic group string is coupled with the inversion module through the shared converging module. Optionally, the photovoltaic string coupled to the set of string power optimizers is a first photovoltaic string, and the photovoltaic string coupled to the bus module is a second photovoltaic string; Wherein the number of first photovoltaic strings is less than the number of second photovoltaic strings. Optionally, the number of the first photovoltaic group strings is one string, and the number of the second photovoltaic group strings is multiple strings. Optionally, the photovoltaic string coupled to the set of string power optimizers is a first photovoltaic string, and the photovoltaic string coupled to the bus module is a second photovoltaic string; the length of the first photovoltaic group string is smaller than that of the second photovoltaic group string, and the difference value of the lengths of the second photovoltaic group strings is smaller than a set threshold value. Optionally, the photovoltaic string coupled to the set of string power optimizers is a first photovoltaic string, and the photovoltaic string coupled to the bus module is a second photovoltaic string; The illumination time of the first photovoltaic group string is smaller than that of the second photovoltaic group string. Optionally, the photovoltaic string coupled to the bus module is a second photovoltaic string; the second photovoltaic group string also comprises a protection unit, wherein the protection unit is connected in series between the output end of the second photovoltaic group string and the confluence module. Optionally, the protection unit comprises at least one of an anti-reflection diode, a fuse and a protection switch. Optionally, the correspondence of the component-level power optimizer to the photovoltaic component includes at least one of: the assembly level power optimizer is coupled with one of the photovoltaic assemblies; the module level power optimizer is coupled with at least two of the photovoltaic modules. Optionally, the connection buses of the group of cascade power optimizers, the confluence module and the inversion module are direct current buses; the photovoltaic module-level power generation system further comprises a direct current load and/or a direct current power supply, wherein the direct current load is coupled with the direct current bus, and the direct current power supply is coupled with the direct current bus. Optionally, the direct current load comprises at least one of an energy storage battery and a charging pile. According to the photovoltaic module-level power generation system provided by the embodiment of the invention, through setting the connection modes of two differ