What is Islanding?
A distributed power generator, such as a solar system, continues to supply power to the grid after the electric utility has gone down in an islanding condition.
In an islanded system, there is no connection to the larger power grid, and the local generation must meet the entire load.
This can be a problem if the demand exceeds the generation capacity or if there is a sustained loss of power from the local generating source.
Problems Caused By Islanding
Islanding causes many problems, some of which are listed below:
1.Safety Concern: The most important concern is safety, because even in the event of a power outage caused by distributed generators, the grid may still be active. This might confuse utility workers and put them at risk of electric shocks.
2.Damage to customers’ appliances: Because of islanding and distributed generation, there may be a bi-directional flow of power. This can wreak havoc on electrical equipment, appliances, and gadgets, injuring them severely. Some devices are more sensitive to voltage changes than others, and they should always be protected with surge suppressors.
3.Inverter damage: Inverters are used to protect large solar installations from damage. Multiple inverters are utilized with the distributed generators in this case. Inverter malfunctioning might cause issues with the normal operation of the inverters.
How to Protect Against Islanding?
There are two main types of anti-islanding protection: active and passive.
Active anti-islanding uses sensors to detect when the grid is down and then shuts off the power.
Passive anti-islanding does not use sensors, but instead relies on the characteristics of the system to detect islanding.
Both active and passive anti-islanding methods have their advantages and disadvantages.
Active methods are more expensive, but they provide better protection against islanding.
Passive methods are less expensive, but they may not provide as much protection.
The best way to protect against islanding is to use a combination of both active and passive methods.
This will ensure that the system is able to detect islanding and shut off the power in a timely manner.
What Is Islanding Mode Of Microgrid
When a microgrid is disconnected from the main grid and functions independently with tiny sources and load, it is in islanded mode.
In this mode, the microgrid functions as a separate system and it is not influenced or affected by the main grid.
The main grid acts as a backup source of power for the microgrid in case of any failure in the micro sources.