Generating Device of Grid-connected photovoltaic and ESS with backflow prevention function

摘要

In accordance with an embodiment of the present invention, a system-connected photovoltaic and ESS power generation device having a backflow prevention function includes: a photovoltaic power generation unit 10 that generates electric energy based on sunlight; A surge protection unit 20 receiving the current output from the photovoltaic power generation unit 10 and outputting it to the first ground line 30 when a surge current greater than the standard is introduced; A first ground line 30 connected to the ground from the surge protection unit 20 and providing a surge current output from the surge protection unit 20 to the ground; A current conversion unit 40 receiving the output current of the photovoltaic power generation unit 10 that has passed through the surge protection unit 20 and converting it within a set current used in the ESS 90; A direct current converter 50 for receiving the alternating current converted by the current converter 40 and converting it into a direct current current; A high-capacity cut-off unit 60 outputting a normal current if the AC current converted by the DC converter 50 is within the registered reference and outputting it to a ground line if it is higher than the reference; A second ground line 70 connected to the ground from the high capacity blocking unit 60 and providing a high capacity current output from the high capacity blocking unit 60 to the ground; An ESS (90) receiving and storing the direct current passing through the noise blocking unit (80); An abnormal output current checking unit 100 that receives the current output when the ESS 90 is operated and outputs the abnormal output current to the third ground line 110 if it is an abnormal output current greater than the registered reference; A third ground line 110 connected to the ground from the abnormal output current check unit 100 and providing the overcurrent generated in the ESS 90 to the ground; The surge protection unit 20 has one end connected to the first ground line 30, the second ground line 70, and the third ground line 110, the other end connected to the ground, and output to the first ground line 30 ) Of the surge current, the overcurrent of the high-capacity blocking unit 20 output to the second ground line 70, and the abnormal output current of the abnormal output current check unit 80 output to the third ground line 90 to the ground And, it characterized in that it comprises a reverse flow prevention unit 120 for preventing the reverse flow of the reverse current from the ground to the first ground line 30, the second ground line 70, and the third ground line 90. do.