Frequency and Voltage are two important parameters which decides the healthiness of the electrical grid at a particular instant of time.
Frequency fluctuations occur in the electrical grid when there is mismatch between the amount of power generation and amount of power demand. Both under frequency and over frequency operation is harmful to the operation of power system.
In electrical grid over frequency operation is a rare phenomenon. Most of the cases we observe frequency drop phenomenon due to lack of power generation supporting the demand. Hence frequency in the power system drops below the rated.
When the frequency tends to drop governor systems connected to the Turbo-Generators in electrical grid will act and allow more steam to flow to turbine and increase the speed. However there is limitation for this band. Beyond certain limit of operation if grid frequency is drop Islanding operation is employed in the grid.
Islanding Operation:
When the frequeny of the overall electrical grid is declining below the rated at pre determined frequency Ellectrical grid is divided into number of small islands which contains some generation units and load centers come out of the grid and operate together until the normal frequency is restored. This method of spliting the electrical grid in to small Islands is to protect the healthy part of the grid.
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