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Modern power systems shall meet the requirements of efficiency, survivability, reliability of power supply for consumers. The requirements, which become more rigid under conditions of the competitive power supply market, shall be solved by introduction of Smart Grid technologies. Smart Grid technologies stipulate wide use of distributed generation units. Distributed generation can cause fluctuation of voltage and frequency leading to the flicker noise, which is the visual perception instability. The article presents results of mode modeling of distributed generation units implemented on the basis of synchronous generators. Obtained results show that, when a load in grids with uncontrolled regulators is switched off/on, flicker noise caused by voltage/ frequency fluctuations occurs. Unmatched tuning of excitation/ frequency regulators of distributed generation unit synchronous generators can cause the same effect. Modeling results show that elimination of flicker noise is possible through using matched tuning of these regulators.

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