PV SYSTEM FOR GENERATING SOLAR POWER INCLUDING VOLTAGE BOOSTING DEVICE FOR EACH STRING

摘要

The voltage boosting device for each PV string of the present invention is connected to the output terminal of each of a plurality of PV strings included in the photovoltaic system, boosts the output voltage of the corresponding PV string, and increases the PV input voltage input from the PV string. an input voltage detection unit to detect; a current detection unit for detecting a current output to the inverter to derive a PV output voltage; a reverse flow prevention diode installed between the input voltage detection unit and the current detection unit to prevent a reverse flow of the PV output voltage; a booster unit installed between the input voltage detection unit and the backflow prevention diode to boost or bypass the PV input voltage; And, based on the voltage difference between the PV input voltage and the PV output voltage, the voltage drop of the corresponding PV string is detected, and the operation of the booster unit is controlled based on the result, and the voltage difference determines whether to boost. and a boosting control unit configured to control the booster unit to boost the PV input voltage when it is within a predetermined voltage drop range. Accordingly, the present invention can match the maximum power point of each of the PV strings, prevent the occurrence of multiple poles, and solve the problem of poor boosting efficiency. In addition, the present invention can diagnose the failure of each of the PV strings based on the boosting history information for each PV string.