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The paper describes Reduced Fast Fourier Transformation (RFFT), an algorithm of harmonic estimation based on the FFT, created by authors, convenient for voltage dips detection. The algorithm is simple, fast, computationally inexpensive and sufficiently accurate. It is tested in Matlab / SimPowerSystems environment. Results show that the algorithm is faster and better than the FFT, which is advantage...
The paper describes voltage dips detection method in cases of grid-tie inverter systems. A newly developed harmonic estimation algorithm, Reduced FFT (RFFT), has been applied. The grid-tie inverter system has been modelled and simulated in the Matlab/SimPowerSystems environment. Laboratory experiment was carried out with dSPACE control hardware. The voltage dips were produced by grid emulator. For...
The paper includes the identification of the main factors responsible for the temporal variations of indoor pollutants during three daily intervals in a photocopying shop. The measurements of concentration levels of total volatile organic compounds, ozone, carbon monoxide, carbon dioxide, nitrogen dioxide, ammonia, perchloroethylene and non-methane hydrocarbons were performed. The individual concentrations...
In the conventional regression model, deviations between the observed values and the estimated values are supposed to be due to measurement errors. Here, taking a different perspective, these deviations are regarded as the fuzziness of the system's parameters. Thus, these deviations are reflected in a linear function with fuzzy parameters. Using linear programming algorithm, this fuzzy linear regression...
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