Efficient Adjustment of Frequency and ROCOF Relays

What is it about?

This paper discusses the advantages and disadvantages of application region (AR) and power imbalance application region (PIAR) as typical methods used for adjustment of frequency-based anti-islanding relays and shows the drawbacks of the AR and PIAR of these relays using some examples. In this paper, the AR and PIAR are combined in order to resolve their drawbacks and to achieve more efficient settings for frequency and rate of change of frequency (ROCOF) relays. The goals of the relays adjustment are: islanding detection of synchronous distributed generation (SDG) in an appropriate time, satisfaction of the safe and abnormal frequency variation requirements, and ability to differentiate between islanding disturbances and non-islanding ones.

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Why is it important?

The importance of this work is to propose a method which gives a proper simple and nonexpensive solution to the SDG islanding detection problem by employing common protection devices such as frequency and ROCOF relays and using both the AR and PIAR capabilities.