What is a anti-islanding device and anti-islanding grid-connected box

The monitoring device inside the net cage will accurately measure the flow and magnitude of electrical energy. Under normal circumstances, if the local load consumes less electricity than the electricity generated by the power generation device, the excess electricity will flow into the grid. However, when there is a fault in the power grid or a sudden increase in local load demand, resulting in insufficient electricity supply from the power generation device to the local load, there may be a situation where electricity flows back from the power grid to the power generation system, which is known as the reverse flow phenomenon. The anti backflow and net cage is equipped with a built-in intelligent controller. Once backflow is detected, the output power of the inverter will be quickly adjusted or measures such as cutting off the connection with the power grid will be taken to prevent backflow, thereby ensuring the stable operation of the power grid and the safety of the power generation system.

Structure composition of anti backflow device (anti backflow and net cage)
Circuit Breaker

As an important protective component for anti backflow and net cage, circuit breakers can automatically cut off the circuit in case of overload, short circuit or other abnormal situations, preventing equipment damage and safety accidents. It serves as the primary protection for the entire grid connected system.

contactor

Used to control the on/off of circuits, in the anti backflow grid, the contactor achieves precise control of the flow of electrical energy according to the instructions of the controller. For example, when it is necessary to cut off the connection with the power grid to prevent backflow, the contactor will quickly act to disconnect the circuit connection.

smart electricity meter

This is a key component for monitoring electrical energy data, capable of real-time measurement of parameters such as voltage, current, power, and electrical energy, and transmitting these data to the controller. The high-precision measurement of smart meters provides a reliable basis for preventing backflow and accurately determining the direction of electricity flow and power control.

Anti backflow controller

It can be said to be the "brain" of anti backflow and net cage. It receives data transmitted by smart meters and monitors and manages the entire system according to preset algorithms and control strategies. When a reverse flow signal is detected, the anti reverse flow protection device will immediately issue instructions to adjust the operating status of the relevant equipment to achieve the anti reverse flow function.

Lightning Protection module

Due to the fact that distributed energy systems are typically installed outdoors, they are susceptible to natural disasters such as lightning strikes. The lightning protection module can effectively introduce lightning into the ground, protect the electrical equipment inside the net cage from lightning damage, and ensure the stable operation of the system even under adverse weather conditions.

communication module

Some anti backflow and net cages are equipped with communication modules, which can achieve data transmission with remote monitoring centers. Through communication networks, operation and maintenance personnel can real-time understand the operating status, power parameters, and other information of the grid, which facilitates remote management and fault diagnosis of distributed energy systems and improves operation and maintenance efficiency.