PHOTOVOLTAIC SOLAR CONNECTION BOARD HAVING BYPASS FUNCTION FOR FIRE PREVENTION

摘要

The present invention relates to a photovoltaic connection board having a bypass function for fire prevention, which can detect a fire on a per-main string basis, block a main string in which a fire is detected, and transfer power, output by a photovoltaic array connected to the blocked main string, to a sub-string; thereby continuously supplying electric power. For this purpose, the photovoltaic connection board having a bypass function for fire prevention according to the present invention comprises: a main string which is connected between a (+) output terminal of a photovoltaic array and a (+) input terminal of an inverter, in which a terminal and a fuse are installed, and which includes a first thyristor configured to prevent a reverse current and to interrupt a circuit; a sub-string which is connected to the main string in parallel, in which a terminal and a fuse are installed, and which includes a second thyristor configured to prevent a reverse current and to interrupt the circuit; an earth string which is connected between a (-) output terminal of the photovoltaic array and a (-) input terminal of the inverter; a temperature detection unit which detect temperature of the main string and the sub-string; a power detection unit which detect a voltage and current of the main string and the sub-string; and a control unit which determines a probability of an electrical fire based on results of the detection of the temperature detection unit and the power detection unit, which blocks a string vulnerable to an electrical fire when the probability of an electrical fire is determined to be high based on a result of the former determination, and which controls the first and second thyristors to connect the blocked string to a string connected to the blocked string in parallel.