Sviatoslav Vasylets
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View article: Determination of regulation characteristics of capacitor exciter with variable topology for self-excited induction generator
Determination of regulation characteristics of capacitor exciter with variable topology for self-excited induction generator Open
The object of the study is a capacitor exciter with variable topology, designed to operate as part of an autonomous induction generator. Insufficient efficiency of controlling the excitation level of an autonomous induction generator when …
View article: Оцінювання точності вузла обліку електроенергії при зниженому струмі навантаження
Оцінювання точності вузла обліку електроенергії при зниженому струмі навантаження Open
Запропоновано метод та розроблено програму EMRL для оцінювання дійсного споживання електроенергії та найбільш можливого недообліку за показами лічильника у складі вузла обліку в разі зниженого струму навантаження. Оцінювання здійснюється н…
View article: Increasing the accuracy of electrical energy accounting at reduced load
Increasing the accuracy of electrical energy accounting at reduced load Open
The object of research is a three-phase electricity metering unit, which includes a digital meter and measuring current transformers. The reduction of non-technological energy losses is restrained due to the insufficient accuracy of the ac…
View article: Підтримання балансу шахтних вод поствугільних регіонів за рахунок фотоелектричної генерації
Підтримання балансу шахтних вод поствугільних регіонів за рахунок фотоелектричної генерації Open
Запропоновано метод оцінювання оптимальної встановленої потужності фотоелектричної станції для живлення головного водовідливу закритої шахти. В якості критерія оптимізації обрано наближення до нуля річного сальдо по оплаті за електроенергі…
View article: Increasing the accuracy of electricity accounting by digital information-measuring systems
Increasing the accuracy of electricity accounting by digital information-measuring systems Open
Significant non-technological losses of electricity are observed in 0.38 kV distribution networks, which lead to financial dam-ages of energy supply companies. The reason for their occurrence is the deficiencies in the accountingunits func…
View article: Determining optimal rated power of a photovoltaic station for mine dewatering
Determining optimal rated power of a photovoltaic station for mine dewatering Open
The object of the study is the main dewatering system of the mine. Climate change has stimulated the refusal to use coal in many countries. In conditions of massive closure of mines, there is a need to pump out mine waters to avoid floodin…
View article: Research on accuracy of electrical energy measurement in microgrid for mine dewatering
Research on accuracy of electrical energy measurement in microgrid for mine dewatering Open
The object of the study is the current transformers of the electricity metering unit as part of the microgrid for mine dewatering, which includes a photovoltaic station. The need to pump mine waters is caused by the danger of flooding larg…
View article: Determining the static characteristic of a measuring current transformer at a reduced load of the metering unit
Determining the static characteristic of a measuring current transformer at a reduced load of the metering unit Open
The object of the research is a measuring current transformer of the electromagnetic type, which is used as part of the electricity metering unit. The current transformers functioning in the mode of reduced primary current is accompanied b…
View article: Refinement of the mathematical model of electrical energy measurement uncertainty in reduced load mode
Refinement of the mathematical model of electrical energy measurement uncertainty in reduced load mode Open
The object of the study is a three-phase commercial electricity metering unit for 380 V electrical grids. The uncertainty of electricity measurement in the reduced load mode is estimated by the relative deviation of the active energy, meas…
View article: Mathematical Modeling of Current Leakage in the Combined Power Network of a Mine
Mathematical Modeling of Current Leakage in the Combined Power Network of a Mine Open
Mathematical model of the cable line as a part of the combined mine power network was developed, taking into account the current leakage through the human body. Simulation has shown that the cable branch of the frequency converter is chara…
View article: Refinement of the mathematical model of frequency converter cable branch with a singlephase short circuit
Refinement of the mathematical model of frequency converter cable branch with a singlephase short circuit Open
The mathematical model of the frequency converter cable branch as a part of the mine section power network with a single phase-to-ground fault is clarified. The model takes into account a discrete nature of the output voltage and power swi…
View article: Improving the mathematical model of a three-phase autonomous voltage inverter
Improving the mathematical model of a three-phase autonomous voltage inverter Open
УДОСКОНАЛЕННЯ МАТЕМАТИЧНОЇ МОДЕЛІ ТРИФАЗНОГО АВТОНОМНОГО ІНВЕРТОРА НАПРУГИ Удосконалено математичну модель трифазного автономного інвертора напруги, яка дозволяє досліджувати перехідні процеси при комутації силових ключів.Запропонована мод…
View article: Improvement of the mathematical model of singlephase halfbridge inverter in statevariable form
Improvement of the mathematical model of singlephase halfbridge inverter in statevariable form Open
The mathematical model of the insulated-gate bipolar transistor in the IGBT module is improved due to the determination of analytical expressions for dynamic spurious capacitances of the device. The expressions are obtained by analytical d…
View article: IMPROVEMENT OF THE IGBT MATHEMATICAL MODEL WITH NONLINEARITY OF JUNCTION CAPACITANCES
IMPROVEMENT OF THE IGBT MATHEMATICAL MODEL WITH NONLINEARITY OF JUNCTION CAPACITANCES Open
Запропоновано математичну модель, яка відрізняється від відомих обчисленням аналітичних виразів для часткових похідних за відповідними напругами на ємностях від виразів, що апроксимують статичні залежності паразитних ємностей приладу від н…