The Role of Anti-backflow Equipment in Photovoltaic Equipment

When the photovoltaic inverter converts the direct current generated by photovoltaic modules into alternating current, it will be mixed with direct current components and harmonics, three-phase current imbalance, output power uncertainty, etc. At present, basically, no control measures have been taken. Therefore, when the generated power is sent to the public power grid, it will cause harmonic pollution to the power grid, which is easy to causes grid voltage fluctuations, flicker, and so on. If there are many such generators transmitting power to the grid, the power quality of the grid will be seriously degraded. In some areas, the capacity of transformers and industrial power transformers and the installed capacity of photovoltaic projects are at saturation. The power grid company requires that the photovoltaic grid-connected system built later be an irreversible current generation system, which means that the electricity generated by the photovoltaic grid-connected system is consumed by the local load, and the excess electricity is not allowed to be reversely transmitted to the upper-level power grid through the low-voltage distribution transformer. Therefore, this type of photovoltaic power generation system must be equipped with anti-reverse flow facilities to prevent the occurrence of reverse power.

When the photovoltaic power generation is greater than the load demand, reverse power will be generated. Therefore, we need the device to determine that the inverter has over-power output, and then the instrument sends a signal through RS485 communication to interact with the inverter data to adjust the output power of the inverter to balance the output power and the power consumption.

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