The anti-islanding test protection scheme of the inverter is to ensure that the inverter can stop the power supply in time in the event of a fault or power outage to avoid the occurrence of islanding. Islanding refers to the fact that inverters continue to supply power when the grid is out of power or fails, which can pose a safety hazard to grid maintenance personnel and equipment. The inverter monitors the status of the grid to determine if there are islands of supply. When the inverter detects a power outage or fault in the grid, it immediately stops the power supply to avoid the occurrence of islanding.
The inverter can also determine if there are islands of power supply by monitoring the frequency and phase of the grid. When the inverter detects an abnormality in the grid frequency or phase, it immediately stops the power supply to avoid the occurrence of islanding. The inverter can also monitor the voltage of the grid to determine if there are islands of supply. When the inverter detects that the grid voltage is outside the preset range, it will immediately stop the power supply to avoid the occurrence of islanding. The inverter usually communicates with the grid to obtain grid status and control signals. When the inverter loses communication with the grid or receives a power outage signal, the power supply will be stopped immediately to avoid the occurrence of islanding.
The inverter can determine whether there are islands of power supply by detecting the grid connection. When the inverter detects that the grid is disconnected or cannot be connected to the grid, it immediately stops the power supply to prevent the occurrence of islanding. The inverter can set a range of frequency and phase deviations, and when the frequency and phase of the grid exceed this range, the inverter will immediately stop supplying power to prevent the occurrence of islanding. When the inverter loses communication with other devices or the monitoring system sends out a power outage signal, the inverter stops power immediately. The inverter can be set with a delayed start function, that is, after the power supply is restored to the grid, the inverter will delay a period of time before starting the power supply to ensure the stability of the power grid and avoid the occurrence of islanding.
The anti-islanding test protection scheme of the inverter uses a variety of measures to determine and prevent the occurrence of power supply islands, so as to ensure the safe and reliable operation of the power grid.