Analysis on Early Warning Methods for Deviations in In-put Voltage of Each Component String Branch during the Operation of Photovoltaic DC Combiner Boxes
Photovoltaic DC combiner box is a device that inputs the DC current of parallel photovoltaic modules in series and then outputs the current centrally.Currently,in order to improve the operating ef-ficiency,the number of modules in series at the input end of the combiner box has been increased in design,which increases the output voltage of the combiner box and reduces line losses.However,this also brings a hidden danger to the operation of the combiner box.When the input voltage drops due to internal photovoltaic module failure in a certain circuit string,the parallel string will generate internal current circulation due to voltage deviation,causing internal component heating and reducing the out-put voltage of the combiner box,which is not conducive to the operation of the entire DC system.
Photovoltaic DC Combiner BoxVoltage DeviationCurrent Circulation
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