Today, with the increasing popularity of distributed energy, especially when users install spontaneous power sources such as photovoltaics, the flow of electricity in the power grid has shifted from the traditional one-way mode to a complex two-way mode. In this context, the importance of anti backflow electric meters as a specialized intelligent metering device is becoming increasingly prominent. It is essentially a power "sentinel" with specific control and judgment functions, with the core mission of real-time monitoring of power flow and ensuring that excess electricity generated spontaneously by users is not transmitted back to the public grid, thereby enjoying the benefits of self use while meeting specific grid safety regulations.

Core working principle: real-time monitoring and intelligent judgment

The basic function of an anti backflow meter is to accurately measure and determine the direction of energy flow. In the traditional electricity consumption mode, electricity always flows from the public grid to the user load, and the direction of current is single. The anti backflow meter can sensitively identify changes in the flow direction by continuously and accurately monitoring the phase relationship between current and voltage internally. When the electricity generated by photovoltaic and other power generation equipment on the user side exceeds their immediate consumption demand, the excess electricity will seek to flow towards the lower pressure grid side, forming a "reverse flow". At this point, the meter will immediately detect this critical flow reversal. Its core logic is not simply to prevent all power flow, but rather to act like an intelligent traffic commander, always locking the net flow direction at the grid access point as' incoming 'to the user side. It ensures that the net power flowing to the grid is always zero or negative by comparing the generated power with the load power in real time, that is, there is no excess power "overflowing" to the public lines.

The core role and strategic value of anti backflow electric meters

The core functions of anti backflow electric meters can be summarized into two aspects: ensuring grid safety and optimizing user energy utilization. From the perspective of power grid security, its strategic value is irreplaceable. Traditional distribution network design is based on unidirectional flow of electrical energy and does not take into account the random feedback of a large number of distributed power sources. If thousands of users simultaneously transmit and distribute excess power in reverse, it is highly likely to cause local line voltage to rise or exceed limits, which may lead to misoperation of power grid protection equipment, deterioration of power quality, and even threaten the personal safety of line maintenance personnel. The anti backflow meter eliminates this reverse transmission behavior from the source and has become the ?line of defense to maintain the stable operation of local distribution networks. It is a key safety technology requirement for power grid companies when connecting self generating users to the grid.

From the user's perspective, the anti backflow meter is a key technical equipment for achieving the "self use, no grid connection for surplus electricity" mode. For users who do not have surplus electricity grid subsidies or adopt this grid connection protocol, installing an anti backflow system (with this meter as the core) is the optimal solution to maximize energy efficiency. It ensures that the photovoltaic power it produces is prioritized and fully consumed locally, minimizing the need to purchase electricity from the grid and directly reducing electricity bills. When the power generation exceeds the electricity consumption, the system will control the power generation equipment through the instructions of the electricity meter (such as adjusting the output power of the photovoltaic inverter), so that the power generation matches the electricity consumption in real time, rather than wasting the excess electricity without value. This not only complies with the rules of the power grid, but also achieves the ultimate utilization of energy and protects the investment return of users.

The composition and future extension of anti backflow system

It should be noted that achieving a complete anti backflow function usually requires a microsystem with an anti backflow meter as the "brain". In addition to the meter itself, which has detection capabilities, this system often requires an execution unit, usually a controller or inverter that can communicate with the meter. When the "brain" of the electricity meter determines that a reverse flow of electricity is about to occur, it will immediately issue instructions to the execution unit, which will quickly adjust the output of the power generation equipment, dynamically balancing power generation and consumption, and eliminating the conditions for reverse flow from the root. Therefore, the anti backflow meter is an indispensable decision-making center in this protection and control circuit. With the intelligent development of energy management systems, the function of anti backflow meters is also evolving towards more advanced "energy dispatch", laying the foundation for future integration into energy storage systems and achieving more complex peak valley regulation.