Abstract
The development of Russia’s electric power industry includes, as one of important objectives, step by step intellectualization of the electric power system under the conditions of decentralized generating capacities and wide use of facilities on the basis of renewable energy sources. The Smart Energy System of Russia national project implies construction of digital substations equipped with state of the art relayprotection and automatic control devices, which exchange instantaneous values of currents and voltages. In implementing such exchange, a need may arise to decrease or increase the signal sampling frequency for optimally suiting to the process tasks. The results from analyzing the effects of digital processing involving loss of coherence of power frequency voltage and current signals, which arise in decreasing the sampling frequency, are presented. It is shown that, if the coherence requirements are not complied with in decimation, this will result in significant errors in estimating the signal parameters. It is also shown that for determining the current and voltage signals sine wave distortion degree due to loss of coherence in processing, it is advisable to use a normalized mutual correlation ratio. It has been demonstrated based on simulation results that for signals containing high frequency harmonic components, incoherent samplingaggravates the distorting effect; it is also pointed out that in analyzing distortion effects on power frequency signals, it is important to take into account the initial phases of high frequency harmonic components.
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