1. Product Overview

The photovoltaic grid-connected cabinet is mainly composed of disconnecting switches, circuit breakers, and relevant control components. It exists as the main export of the photovoltaic power station in the photovoltaic system and is a key power distribution device connecting the generator system and the power grid system. Since it is equipped with a complete grid-connected protection device and can play the role of connecting the generator to the grid, it is called the "grid-connected cabinet".

2. Product Functions

1. Protection Function
   • Detection of Voltage Loss and Opening of the Circuit Breaker: When the loss of grid voltage is detected, it can quickly open the circuit breaker to prevent damage to the equipment caused by abnormal conditions.
   • Detection of Voltage Presence and Closing of the Circuit Breaker: When a suitable grid voltage is detected, it can automatically close the circuit breaker to ensure the normal connection between the power generation system and the power grid.
   • Overcurrent Protection: When the current in the circuit exceeds the set value, it can timely cut off the circuit to avoid damage to the equipment due to overcurrent.
   • Overvoltage Protection: It can prevent damage to the photovoltaic system equipment caused by excessive grid voltage and ensure the safe and stable operation of the equipment.
   • Islanding Protection: When a fault occurs in the power grid or there is a power outage, it can quickly isolate the photovoltaic system from the power grid to form an island and prevent danger to the power grid maintenance personnel.
   • Anti-backflow Protection: It can prevent the photovoltaic power generation system from sending power back to the power grid to ensure the safe and stable operation of the power grid.
   • Harmonic Treatment: It can reduce the pollution of the power grid by the harmonics generated by the photovoltaic power generation system and improve the power quality.
   • Reactive Power Compensation: It can improve the power factor, reduce the line loss, and improve the efficiency and economic benefits of the power generation system.
2. Display and Indication Function: It has the function of displaying the operating parameters and status indications of the photovoltaic power generation system, which is convenient for the staff to understand the operating conditions of the system in real - time, such as parameters like voltage, current, power, and power generation, as well as the working status of the equipment.

3. Product Functions

1. Connection and Grid Connection: It connects the photovoltaic power station and the power grid, realizes the reliable connection between the photovoltaic power generation system and the power grid, and transmits the electric energy generated by the photovoltaic power station to the power grid.
2. Protection and Metering: It can protect the safety of the equipment in the photovoltaic power generation system and accurately measure the total amount of photovoltaic power generation at the same time, providing accurate power data for the power generation enterprise.
3. Fault Maintenance Management: It is convenient for the fault maintenance management of the photovoltaic system. When a fault occurs in the system, the fault point can be quickly located through the grid - connected cabinet for isolation and maintenance, reducing the impact of the fault on the power generation system.
4. Improve Safety and Economic Benefits: Through various protection functions, it can improve the safety of the power generation system and reduce the probability of equipment damage and faults. At the same time, through functions such as reactive power compensation, it can improve the efficiency of the power generation system, reduce the operating cost, and improve the economic benefits.

4. Application Scenarios

It is widely used in photovoltaic power generation systems. Whether it is a large - scale centralized photovoltaic power station or a small - scale distributed photovoltaic power generation project, the photovoltaic grid - connected cabinet can be used. It is used in conjunction with the photovoltaic grid - connected inverter to form a complete photovoltaic power generation system solution to meet the photovoltaic power generation projects of different scales and requirements.