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Abstract
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Under Frequency Load Shedding (UFLS) is an important protection scheme to maintain the frequency of a Distribution Network (DN) consisted of Distributed Generations (DGs) exposed of power deficit. The different location and amount of load curtailments based on different parameters are acquired from several kinds of literatures. In this paper, an optimal adaptive UFLS method with the advent of two main modules has been proposed. Proposed method provides a revised Rate of Change of Load (ROCOFL) index related to bus voltage and loads power consumption (ROCOFL*pv). Using wide area measurement system, Demand Response (DR) technology for the sake of shedding fewer loads is emerging under the background of the smart grid. In addition, smart appliances can provide real-time data packet in which frequency, the rate of change of frequency, voltage magnitude and breaker status are measured. Proposed method is implemented in five different load schemes considering DR programs. Comparative analyses are illustrated in this paper to assert the efficiency of implementing DR programs in which cost function and amounts of shedding loads are decreased. According to the results, we are not allowed to use DR programs in a big power unbalance in an islanded micro grid. The unintentional delay time imposed by DR and a small inertia exists in an islanded distribution network limit the use of DR programs.
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