U. Rudez and R. Mihalic (Slovenia)
Frequency, shedding, gradient, scheme, protection.
The importance of a well established electric power system protection is a fact, underfrequency load shedding included. In order to upgrade and improve the traditional approach to underfrequency load shedding, suggestions of using the frequency gradient can be found in the literature. However, many system parameters must be known in order to obtain useful information from measuring the frequency gradient. If the assumption of knowing those parameters is made, it is possible to lower the amount of the total shedding volume, by gathering the information that the second frequency gradient carries. In the paper, one of such ideas is presented, that is showing considerable improvement compared to traditional scheme.
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