As the global demand for renewable energy continues to grow, photovoltaic power generation as an important part of clean energy, its application is more and more extensive. The grid-connected process of photovoltaic power station and power grid is the key to realize the efficient utilization of photovoltaic power generation system, among which the role of "photovoltaic grid-connected cabinet" is crucial. However, in the process of grid-connected operation of photovoltaic power station, the problem of photovoltaic grid-connected cabinet tripping often occurs.

First, the core components of the photovoltaic grid-connected cabinet include:
Inverter: Converts direct current into alternating current that meets the frequency and voltage requirements of the grid.
Protection device: including overcurrent, overvoltage, frequency protection, grounding protection, etc., can cut off the connection with the power grid when the power grid is abnormal, to prevent damage to photovoltaic equipment.
Monitoring system: real-time monitoring of power grid voltage, current, frequency and other parameters to ensure the normal operation of the system.
 
Second, the common causes of photovoltaic grid-connected cabinet tripping
Pv grid-connected cabinet tripping is usually caused by a variety of electrical faults or system abnormalities. Specific reasons include the following aspects:
 
Overcurrent protection: When short circuit, overload or other electrical faults occur in the power grid, the current may greatly exceed the normal working range, resulting in the triggering of the overcurrent protection device of the photovoltaic grid-connected cabinet. This is to prevent high currents from causing damage to equipment, especially important equipment such as inverters. When the overcurrent fault occurs, the grid-connected cabinet usually immediately disconnects the photovoltaic power station from the grid.
 
Overvoltage or undervoltage: Voltage fluctuations in the grid are another common cause of tripping. The built-in overvoltage and undervoltage protection device of the PV grid-connected cabinet can monitor the voltage change of the grid in real time. When the voltage exceeds the set threshold, the PV grid-connected cabinet will trigger trip protection to prevent equipment damage caused by high voltage, or can not provide stable power output when the voltage is too low.
 
Abnormal frequency: Abnormal frequency of the power grid (such as frequency beyond the allowable range of 50Hz or 60Hz) will lead to synchronous damage of the power grid and the photovoltaic power station, and then make the inverter can not work normally. When the power grid frequency deviates from the normal range, the frequency protection device of the photovoltaic grid-connected cabinet will start and disconnect from the power grid to avoid affecting the photovoltaic equipment.
 
Inverter failure: The inverter is one of the core components of the photovoltaic power station, and its failure (such as overtemperature, overload, hardware failure, etc.) is one of the important reasons for the grid-connected cabinet trip. If the inverter fails to convert DC to AC, the current does not meet the requirements of the power grid, triggering the protection mechanism of the grid-connected cabinet.
 
Grounding failure: If the grounding system of the photovoltaic power station fails, it may cause leakage current. The grid-connected cabinet is usually equipped with a grounding protection function, and when a leakage or grounding fault is detected, it will automatically cut off the connection between the photovoltaic power station and the grid to ensure electrical safety.
 
Grid quality problems: Fluctuations in grid quality, such as harmonic pollution, voltage mutations or frequent switching operations, may also cause the PV grid-connected cabinet to trip. Although grid companies usually keep the quality of the grid stable, in some regions, when the grid fluctuates greatly, photovoltaic power plants may be affected.
 
Third, solve the photovoltaic grid-connected cabinet tripping problem
In order to reduce the incidence of photovoltaic grid-connected cabinet tripping and ensure the stable grid-connected photovoltaic power station and power grid, it is recommended to take the following measures:
 
Regular testing and maintenance: Regular maintenance and inspection of photovoltaic grid-connected cabinets, including comprehensive testing of inverters, current protection devices, grounding systems, etc. In this way, potential problems can be detected in a timely manner and the risk of equipment failure can be reduced.
 
Optimization of grid-connected Settings: In the grid-connected process of photovoltaic power stations, the parameter setting of the inverter is crucial. Ensure that the output voltage and frequency of the inverter are synchronized with the power grid, and timely adjust the power generation parameters of the photovoltaic power station according to the fluctuations of the power grid to avoid tripping caused by voltage or frequency instability.
 
Use of high-quality equipment: The use of high-quality photovoltaic inverters, grid-connected cabinets and other electrical equipment helps to improve the stability and reliability of the system. Selecting equipment with high fault tolerance and considering changes in grid quality in the design can significantly reduce the risk of tripping.
 
Strengthen the selection of grid access points: The selection of access points for photovoltaic power stations should consider the load of the grid, stability and the dispatching capacity of the grid. Especially in areas where the power grid is more unstable, coordination with the power grid operating company should be strengthened to ensure that the electrical conditions of the parallel points meet the requirements.
 
Strengthen the training of technical personnel: professional training for the operation and maintenance personnel of photovoltaic power stations to ensure that they master the operation process and emergency treatment methods of photovoltaic power stations, which can effectively avoid tripping of grid-connected cabinets due to improper operation.