The inverter is a device that converts DC power into AC power. Since the solar cell emits DC power, and the final photovoltaic power generation system needs to be connected to the AC load, the inverter is an indispensable device.
According to the operation mode, inverters can be divided into independent operation inverters and grid-connected inverters. Standalone inverters are used in stand-alone solar power systems to supply power to stand-alone loads. The grid-connected inverter is used for grid-connected photovoltaic power generation systems, and feeds the generated electrical energy into the grid for operation. The grid-connected inverter converts the DC power generated by the photovoltaic array into AC power in the same phase as the grid. When the grid fails, the inverter should stop working and disconnect the inverter load to prevent the “islanding effect”.
The island effect refers to the phenomenon of the power outages power output device connected to the connected grid -connected power generation device when some lines of the grid of the grid due to faults or maintenance, and together with the surrounding load forming a self -sufficiency island.
Photovoltaic Box Transformer
Before the photovoltaic power generation system is connected to the grid, select a suitable booster transformer according to the voltage of the grid-connected main line, and boost the 400V AC output from the inverter to the voltage level of 10kV, 35kV or 110kV required for grid connection, so as to meet the conditions for grid connection.