Monitoring method of junction box for photovoltaic module

Abstract

The invention discloses a monitoring method of a junction box for a photovoltaic module, comprising the following steps of: a. setting an electrical signal acquisition point inside the junction box, acquiring a voltage signal, a current signal, a temperature signal and a magnetic flux signal in the acquisition junction box and transmitting the acquired signals into a signal detection box; b. processing and calculating the received signal by the signal detection box to obtain data and outputting the data through a signal output port; c. transmitting the data output from the signal output port to a terminal monitor by a data transmitting channel; d. identifying the received data and determining the corresponding area of the photovoltaic module, in which the junction box is arranged by the terminal monitor; and e. counting, analyzing and processing the data, judging the work state of the junction box, determining the actual work condition of a photovoltaic battery plate string corresponding to the junction box and positioning to find out the damaged battery plate by the terminal monitor. The invention solves the problems that the actual work condition of a photovoltaic system cannot be effectively monitored and controlled currently and the damaged battery plate cannot be found out by one-step positioning.

Description

technical field [0001] The invention relates to the technical field of photovoltaic systems, in particular to a monitoring method for a junction box for photovoltaic modules that can monitor the real-time working conditions of the photovoltaic system. Background technique [0002] At present, the junction boxes used in photovoltaic systems generally only have a single connection function, which cannot reflect the actual working conditions of the connected photovoltaic modules. When a battery in the battery string in the system fails, the current It passes through the diode in the junction box connected in series and parallel with the battery slice. After the diode continues to work, it will generate heat and lose part of the electric energy. Because the diode works under high temperature for a long time, it is very easy to cause damage and short circuit, thus The power generation of the photovoltaic system is reduced. Therefore, it is necessary to find out the faulty cells a...

AI Technical Summary

Problems solved by technology

[0002] At present, the junction boxes used in photovoltaic systems generally only have a single connection function, which cannot reflect the actual working conditions of the connected photovoltaic modules. When a battery in the battery string in the system fails, the current It passes through the diode in the junction box connected in series and parallel with the battery slice. After the diode continues to work, it will generate heat and lose part of the electric energy. Because the diode works under high temperature for a long time, it is very easy to cause damage and short circuit, thus The power generation of the photovoltaic system is reduced. Therefore, it is necessary to find out the faulty cells as soon as possible. However, at present, the cells can only be checked step by step, and the damaged cells cannot be located in one step. The work is cumbersome and inefficient. At the same time, there is currently a lack of effective monitoring and control of the real-time working conditions of the photovoltaic system, and it is difficult to judge the normal operation of the photovoltaic system in real time from the changes in voltage, current, magnetic flux and temperature through the measurement of various parameters when the diodes in the junction box are working. or not

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