Method and system for online detection of photovoltaic modules

Abstract

The invention discloses a method and a system for online detection of photovoltaic modules. An intelligent control circuit is separately connected with a short-circuiting device, a voltage detection circuit, a current detection circuit, a power supply circuit, a lightning protection module, a manual control circuit, a sound-light alarm circuit and a data transmission and communication circuit connected in parallel to the photovoltaic module; and the data transmission and communication circuit is also connected with a terminal management system. The method and the system for online detection of photovoltaic modules have the advantages that photovoltaic modules can be directly monitored by adopting the system or a header box, so that the fault positioning is more accurate, photovoltaic modules with abnormal parameters can be picked out without faults, the overall power generation capability is improved, and the comprehensive operation and maintenance cost of a photovoltaic power station is reduced; the system is low in cost and convenient to install, the cost is further lower than that of a system with an independent module monitoring module, and the reliability is greatly enhanced; and the productized system can be popularized and applied in all scenes adopting photovoltaic modules for power generation, and thus has great popularization value.

Description

technical field [0001] The invention relates to a method and system for online detection of photovoltaic components in a photovoltaic power station, belonging to the field of detection and control, in particular to the online detection of photovoltaic components for photovoltaic power generation. Background technique [0002] With the national demand for energy conservation and emission reduction and the rise of clean energy, various power generation equipment using clean energy are becoming more and more popular. Especially in recent years, the country has vigorously developed photovoltaic power generation. As of 2015, the installed capacity of photovoltaic power plants in my country has reached 45GW , becoming the country with the largest installed capacity of photovoltaic power plants in the world. [0003] The core of the photovoltaic power station is the photovoltaic module. 20-22 photovoltaic modules are connected in series to form a photovoltaic string. Multiple photov...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the specified photovoltaic module cannot be detected online in photovoltaic power generation. By connecting a controlled short-circuit device in parallel at the output end of the photovoltaic module, the control system sends an instruction to short-circuit a certain piece of photovoltaic in the photovoltaic string. Components, by detecting the output voltage and current of the photovoltaic strings, the performance parameters of the short-circuited components can be analyzed to find out the problematic photovoltaic components in the photovoltaic strings and give an alarm. In order to achieve the above goals, the technical scheme adopted by the present invention is as follows :

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