How to prevent backflow in photovoltaics system

When photovoltaic inverters convert the direct current generated by photovoltaic modules into alternating current, they may contain direct current components and harmonics, three-phase current imbalance, output power uncertainty, etc. Currently, effective measures have not been taken to control them. Therefore, when the generated power is sent to the public power grid, it will cause harmonic pollution to the grid, which can easily cause voltage fluctuations, flicker, etc. If many such power sources transmit power to the grid, it will lead to a serious decline in the power quality of the grid. So this type of photovoltaic power generation system must be equipped with anti backflow facilities to prevent the occurrence of reverse power.

When the photovoltaic power generation exceeds the load demand, reverse power will be generated. Therefore, we need anti-backflow devices to determine if the inverter has excessive power output, and then the instruments can exchange signals with the inverter data through RS485 communication to adjust the output power of the inverter and balance it with the power consumption.