THE EFFECT OF DEVIATION OF WAVEFORMS FROM A HARMONIC MODEL ON THE ERROR
OF THE DETERMINATION OF THEIR INTEGRAL CHARACTERISTICS 

Melent'ev Vladimir Sergeevich, doctor of technical sciences, professor, head of sub-department of information and measuring technique, Samara State Technical University (244 Molodogvardeyskaya street, Samara, Russia), vs_mel@mail.ru
Ivanov Yuriy Mikhaylovich, candidate of technical sciences, senior researcher, sub-department of information and measuring technique, Samara State Technical University (244 Molodogvardeyskaya street, Samara, Russia), fuego27@rambler.ru
Peskova Anastasiya Sergeevna, postgraduate student, Samara State Technical University (244 Molodogvardeyskaya street, Samara, Russia), kalaschnikova_90@mail.ru

621.317

Background. The subject of research is the method of measuring the integral characteristics based on spatial separation of instantaneous values of harmonic signals. The aim of this work is to study a new method of determining the integral characteristics of harmonic signals, the implementation of which involves the formation of two additional voltages and comparison them with the signal which inverted to the input voltage.
Materials and methods. A new approach to the determination of the integral characteristics on the basis of the formation and comparing the additional voltages and the signal inverse to the input one. 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. The use of a new approach to the definition of integral characteristics of harmonic signals has allowed to develop a method in which, in contrast to most known methods based on the use of additional signals is formed the signal inverse to the input voltage. This allows in determining characteristics harmonic signals to apply only the instantaneous values of the input voltage and current, which significantly reduces hardware cost in its implementation. The results of the evaluation of the effect of the degree of deviation of the real signal from the harmonic model on the resulting error of determination of parameters are given.
Conclusions. Implementation of the developed method for the determination of informative parameters provides a significant reduction in hardware costs. The obtained results allow to estimate the accuracy of determining the parameters when the deviation of the input signals from the harmonic model, and choose the parameters of the blocks of the phase shift involved in formation of additional voltages, in accordance with the spectral composition of the signal and the requirements on measurement accuracy.

integral characteristics, harmonic signal, instantaneous values, additional signals, block of formation the phase shift, an error