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Relying on generation side alone is deemed insufficient to fulfill the system balancing needs for future Danish power system, where a 50% wind penetration is outlined by the government for year 2025. This paper investigates use of the electricity demand as frequency controlled reserve (DFR), which has a high potential and can provide many advantages. Firstly, the background of the research is reviewed,...
The power system in the Danish island Bornholm is a distribution system with a high penetration of wind generation, which is representative for expected future power systems. During the period from 11th to 14th September 2007, the Distribution System Operator (DSO) Ostkraft in Bornholm conducted a planned islanding operation test. To evaluate the test and achieve useful experience for future similar...
This paper focuses on analysing frequency quality of Nordic power system using measurements from phasor measurement units (PMU). The PMU data of one year long period is used which has very high time resolution (20 ms per sample) and is able to provide detailed information in evaluating frequency quality and its correlation with time. The results show that the frequency quality of the Nordic power...
Large-scale application about heart pacemaker makes researchers pay more attention to its using life and user's psychological health. In this paper, a heart pacemaker wear life model is introduced by using frequency property and a life distribution is presented. The parametric properties of the density are studied. The moment estimator with negative order is used, which is just the maximum likelihood...
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