Purpose. To present a methodology for determining the optimal switching frequency in converters and autonomous voltage inverters, load of which is an asynchronous electric motor. The based on dependences static dynamic power losses switches inverter dependence windings induction motor higher harmonics currents, also depend frequency. Methodology. Polynomial approximation energy characteristics transistors. General provisions theory electrical circuits. determination additional from...

The theorem of minimum energy losses in three-phase four-wire supply system is formulated this paper. universal relation to determine the components total systems with sinusoidal symmetrical voltage source and any possible load developed.

Purpose. The contradictions in the use of term «reactive power» require justification by clarifying its physical meaning. aim paper is to reveal meaning applied three-phase three-wire and four-wire energy supply systems. Methodology. We have modern theory instantaneous active reactive power, graphical filling complex branched system simplified design scheme, electrical circuits, computer Matlab-simulation. Results. provided answers six basic questions that definition concept power»....

The work with the use of simulation in software Matlab / Simulink SymPowerSystems environment considers construction a local Smart Grid energy supply system distributed solar power plants. obtained model allows us to investigate intelligent network any quasi-steady and transitional modes, including emergency ones. A distinctive feature proposed is localization places for installation active filter-compensating devices, which providing necessary quality electric achieving minimum losses...

Three theorems of the instantaneous power theory, which make it possible to explain nature electromagnetic processes occurring in three-phase supply systems terms assessing energy efficiency question, are formulated and proved.

The paper presents a method of estimation efficiency energy supply systems based on the Smart Grid concept with trunk mode customer connection alternative sources electric and high-capacity storages.

Purpose. To obtain relations determining the components of total losses power with p-q-r theory for three-phase four-wire energy supply systems, uniquely linking four components: lowest possible power, caused by reactive instantaneous active pulsations, current flowing in neutral wire. Methodology. We have applied concepts theory, electrical circuits and mathematical simulation Matlab package. Results. obtained exact relation, which allows to calculate system using three corresponding...

An active filter control strategy that uses pqr instantaneous power concept has been proposed to compensate for the harmonic distortion, line neutral current and reactive in three-phase four-wire systems. The effectiveness of was proved simulations using Matlab/Simulink model power-supply system with an where pollution, imbalance caused by a highly distorting load have drastically reduced.

Four modified block diagrams and calculated ratios for the control systems synthesis of shunt active power filter industrial energy supply are proposed. Comparison corresponding quality compensation techniques is made. It proved that three-phase four-wire electric networks with asymmetrical or semiconductor consumers source under practical conditions, preference should be given to proportional-vector algorithms.

Analytical formulas for calculating the maximum possible efficiency of energy supply system with electric regulated drive three operating modes due to direction flow in -direct, reverse and bi-directional are obtained.It is shown that even at high values direct flows, 1 / 3 2018 N 6 st17 return factor, can be catastrophically low.Referen ces 4, figures 3.

Purpose. The goal is to develop technique of the phase inductance power reactors selection for parallel active filter based on account both low-frequency and high-frequency components electromagnetic processes in a circuit. Methodology. We have applied concepts electrical circuits theory, vector analysis, mathematical simulation Matlab package. Results. developed new filter. It allows us obtain smallest possible value THD network current. Originality. increased accuracy methods reactor...

The possibility of increasing the efficiency DC electric rail traction system due to use active rectifiers -voltage sources on substations for voltage stabilization rolling stock pantograph is substanti-ated.The calculation formulas allowing determining trajectories depending position train are obtained.These allow us determine two methods -«synchronous» and «asynchronous».References 5, figures 4, table 1.

Purpose. Creation of a detailed model solar photovoltaic station with converter system based on cascaded multi-level inverter the MPPT (maximum power point tracker) function to investigate its operating modes in distributed systems. Methodology. To carry out research, paper used methods synthesis, mathematical and computer modeling create models components; physical experiment obtaining thermal characteristics module Solarday SDM72360 W; modern theories for synthesis vector control inverter....

Experimental confirmation of mathematical models is one the aspects scientific process.This article discusses design an experiment with a wind turbine, which was built using model described in [7, 9] and implemented form "Aerodinama" software package [8].The implements calculation according to "Theory real windmill" presented by prof.G.Kh. Sabinin [9].According results, geometric parameters turbine were obtained, as well drawings obtained.Then physical made installed natural conditions.For...

A comparison of two mathematical models decomposition the total power loss in three-phase four-wire systems is made. The paper considers a five-component model used Fluke 437–II Power Quality Monitor - energy calculator, and an alternative four-component based on modern theory. was performed using developed meter components practical conditions. Based results monitoring electrical network 0.4 kV, advantages disadvantages each their prospects for use Smart Grid were determined.

The quality of compensation harmonic distortions for network voltages and currents by means the power active filter depends on control system settings. difference in indicators supply when placing phase sensors to generate a reference signal two possible cases - terminals load (at point connection) is showed paper. It proved that asymmetrical modes three-phase operation placement voltage leads decrease efficiency, shift coefficient an increase THD comparison with second case. developed...

The paper analyzes the operation of Smart Grid electrical power supply system based on solar photovoltaic station with energy storage for smoothing irregularity electric- generation from renewable source. invention relates to a simulation model an device direct voltage converter using high-frequency transformer. possibility in principle ensuring two-directional such design is shown. Results transition processes electric step-like increase level are presented.

A new model for decomposition of the total power losses, which includes four components is proposed. Each proposed has a certain physical meaning due to nature electromagnetic processes in three-phase four-wire system. Definitions describe each are formulated. It shown that supplementary loss proportional minimum possible and square RMS value power, caused by its occurrence supply system, it inversely mean net loss. The synthesized Matlab-model verification four-component structure losses...

Purpose. The goal is to optimize a structure of Matlab-model the three-phase energy supply system with power active filter. mathematical model that describes modes operation which contains additional losses proposed. Methodology. We have applied concepts electrical circuits theory, modeling elements based on linear algebra and vector calculus, simulation in Matlab package. Results. developed two models system. first one representation, second matrix representation processes. Using these we...

Use of the terms "energy", "active power", "reactive power" for power supply systems with semiconductor converters and energy storage is substantiated. Techniques calculating efficiency these are presented.

Purpose. Three-phase energy supply system with a symmetrical resistive load operates in mode the highest possible efficiency case of zero instantaneous reactive power and absence pulsations active power. When parameters are changed, three-phase starts to operate additional losses. The goal paper is determinate relations between components losses their rezone. Methodology. We have applied modern theory power, graphical filling complex branched simplified design scheme, electrical circuits,...