Counter-current meter is an intelligent instrument designed to detect and prevent the reverse flow of current or energy in a power system. This kind of meter plays an important role in new energy generation system, especially in photovoltaic grid-connected system, micro-inverse system, energy storage system and AC coupling system.

Definition and function

Anti-counter-current watt-hour meter through the detection of voltage and current in the circuit to determine the direction of the current, so as to achieve the detection of counter-current. When the current is detected to flow from the load side to the grid side (that is, counter-current phenomenon) , the meter will give an alarm signal and exchange data with external equipment (such as inverter, monitoring system, etc.) through the communication interface, to realize remote monitoring and timely control of the countercurrent.

How it works

The working principle of anti-counter-current watt-hour meter is based on the relationship between current direction and voltage. It includes voltage transformer, current transformer, control unit, alarm output module and communication interface. The voltage transformer is responsible for lowering the high voltage to the low voltage for the internal circuit of the meter; the current transformer detects the current in the circuit and transmits the signal to the control unit. The control unit processes these signals, determines the direction of the current, and issues an alarm signal when a counter-current is detected.

Application scenarios

Photovoltaic (PV) systems: in PV systems, excess power may flow back into the grid when the amount of power generated exceeds the load demand. The counter-current meter can monitor and prevent this phenomenon in real time and ensure the stable operation of the photovoltaic power generation system.

2. Energy storage system: in the energy storage system, when the discharge power is greater than the user's load power, there may be counter-current phenomenon. The use of counter-current meters can effectively avoid this situation and protect the safety of energy storage systems.

3. micro-grid system: in the micro-grid system, the counter-current meter can realize the real-time detection and control of the counter-current to ensure the stable operation and efficient management of the micro-grid.

Function and significance

1. Improve power quality: anti-counter-current energy meter can avoid the loss of counter-current energy and improve the efficiency and quality of power consumption.

2. Ensure system safety: counter-current phenomenon may cause voltage fluctuation, frequency anomaly, and even cause grid failure. The application of anti-counter current watt-hour meter can effectively reduce these risks and ensure the safe and stable operation of power system.

3. Promote the development of new energy: with the development of new energy, counter-current meter will be more and more widely used in power system. It can not only improve the stability and reliability of new energy power generation system, but also promote the extensive application and efficient use of new energy.

Features of the product

At present, counter-current watt-hour meter products on the market have many advantages such as high precision, small volume, fast response speed, easy installation and so on. At the same time, these products also have the function of sampling, measuring and monitoring power parameters, and can communicate with inverters or energy management systems, they can prevent adverse currents, regulate power generation, and charge and discharge batteries.

Counter-current meter is a kind of intelligent instrument which plays an important role in the new energy generation system. Through real-time monitoring and control of current flow, it can effectively prevent counter-current phenomenon and ensure the safe and stable operation and efficient management of power system.