THE ANALYSIS OF THE ERROR OF THE METHOD OF THE DETERMINATION OF PARAMETERS OF SIGNALS BASED ON COMPARING OF THE INSTANTANEOUS VALUES OF THEIR ORTHOGONAL COMPONENTS

Melent'ev Vladimir Sergeevich. doctor of technical sciences, professor, head of sub-department of information and measuring technique, Samara State Technical University (244 Molodogvardeyskaya st., Samara, Russia), vs_mel@mail.ru
Pozdeeva Elena Vladislavovna, postgraduate student, Samara State Technical University (244 Molodogvardeyskaya st., Samara, Russia), yaelenkapavlenko@yandex.ru
Peskova Anastasiya Sergeevna, postgraduate student, Samara State Technical University (244 Molodogvardeyskaya st., Samara, Russia), yaelenkapavlenko@yandex.ru

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Background. Object of research is the method of determination of parameters based on space and time division of the instantaneous values of harmonic signals. The purpose of operation is research of a new method of determination of parameters of harmonic signals which implementation provides formation of orthogonal components of voltage and comparing of their instantaneous values.
Materials and methods. Approach to determination of parameters on the basis of formation only of additional voltage and measurement of the instantaneous values of the signals distributed in space and in time is offered. In the analysis of error due to deviation of the real signal from the harmonic model, used a known method based on the estimation of uncertainty of measurement parameter, as a function, the arguments of which are assigned approximately with an error describing the deviation of the model from the real signal at appropriate points.
Results. Use of new approach to determination of parameters of harmonic signals allowed to develop a method in which, unlike the majority of the known methods based on use of additional signals only one additional voltage is created and only the instantaneous values of input voltage and current are measured. It considerably reduces instrumental expenses in case of its implementation. Results of an impact assessment of a level of a deviation of real signals from harmonic model on a resultant error of determination of parameters are given.
Conclusions. Implementation of the developed method of determination of the informative parameters provides essential abbreviation of instrumental expenses. The results received in operation allow to evaluate an error of determination of informative parameters in case of a deviation of input signals from harmonic model, and also to select parameters, according to spectral content of signals and requirements for measuring accuracy.

parameters, harmonic signal, the instantaneous values, additional signals, orthogonal components, the phase-shifting block, an error.