The article presents selected feature selection methods to determine their optimal set in the task of transients identification in non-intrusive appliance load monitoring system. The architecture of such a system is proposed. In the paper, the method of appliance pattern calculation is introduced. Fisher linear discriminative analysis and correlation analysis are applied to find the most significant features. The approach is verified on real transient state data recorded in laboratory. 10-fold cross validation method exploiting discriminant analysis and decision tree identifiers was employed to verify effectiveness of adopted methods. Experimental results show usefulness of proposed approach allowing to reduce the set of employed feature without decrease of identification accuracy.
The article contains the study about electrical appliance characterization on the basis of power grid signals. To represent devices, parameters of current and voltage signals recorded during transient states are used. In this paper only transients occurring as a result of switching on devices are considered. The way of data acquisition performed in specialized measurement setup developed for electricity load monitoring is described. The paper presents the method of transients detection and the method of appliance parameters calculation. Using the set of acquired measurement data and appropriate software the set of parameters for several household appliances operating in different operating conditions was processed. Usefulness of appliances characterization in Non-Intrusive Appliance Load Monitoring System (NIALMS) with the use of proposed method is discussed focusing on obtained results.
KEYWORDS: Instrument modeling, Microwave radiation, Phase shifts, Power supplies, Measurement devices, Signal detection, Image classification, Resistance, Energy efficiency, Data acquisition
The article contains an overview of electrical devices parameters employed in non-intrusive load monitoring system. Most frequently used parameters of household appliances, based on current and power supply voltage waveforms, are presented. On the basis of performed experiments, the impact of the load on the pattern parameters is demonstrated. The new method for characterization of electrical devices based on their immitance parameters is proposed. The new set of parameters, calculated with the use of designed method and evaluated, is discussed.
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