Multi-assembly level rapid switch-off device and photovoltaic system

Abstract

The invention discloses a multi-assembly level rapid switch-off device which is used for controlling a photovoltaic assembly string connected thereto in a photovoltaic system. The photovoltaic assembly string comprises a plurality of photovoltaic assemblies connected in series. The multi-assembly level rapid switch-off device comprises a microcontroller, a communication unit, a driving circuit, anauxiliary power source, a switching unit and an output bypass diode, wherein the microcontroller communicates with the communication unit and controls the driving circuit, the communication unit is used for transmitting switch-off and switch-on instructions, and the driving circuit receives the instructions of the microcontroller to drive the switching unit to switch off and switch on the photovoltaic assembly string. When the photovoltaic assembly string is switched on, all the photovoltaic assemblies in the photovoltaic assembly string supply power to the auxiliary power source, thereby balancing the power supply to the auxiliary power source by means of all the photovoltaic assemblies and increasing the power generation amount.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a multi-component level rapid shutdown device and a photovoltaic system with a new power supply mode. Background technique [0002] Solar energy, as a low-carbon renewable energy, is not only rich in resources, non-polluting to the environment, but also an energy that humans can use freely. Therefore, solar energy has become the focus of people's attention due to its unique advantages. As the most widely used solar energy, photovoltaic power generation has been vigorously promoted in today's society, and the installation volume is increasing year by year. Distributed photovoltaic power generation system refers to the configuration of smaller photovoltaic power generation systems at the user site or near the power consumption site to meet the needs of specific users, support the economic operation of the existing distribution network, or meet the requirements...

AI Technical Summary

Problems solved by technology

During normal power generation, the switches of multiple fast shutdown devices corresponding to multiple photovoltaic modules will form a series relationship, resulting in large conduction losses and affecting power generation efficiency

[0004] In addition, the power supply method in the existing component-level quick shutdown device uses the first component at the negative end to supply power to the auxiliary power supply, so that the power supply component consumes more current than other components in the same string, so this component becomes the The power generation bottleneck of the string, especially in low light conditions such as morning, evening, cloudy days, rain, snow, and occlusion, the power supply components will cause the entire string to stop power generation ahead of time, which in turn affects the power generation of the system

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