scholarly journals WAY OF CONNECTION OF A THREE-PHASE MOTOR TO A SINGLE-PHASE NETWORK VIA RESONANCE EFFECT

2019 ◽  
Vol 7 ◽  
pp. 920-927
Author(s):  
Zharilkassin Iskakov ◽  
Vladimir Kossov
Keyword(s):  
Single Phase ◽  
Reactive Power ◽  
Theoretical Calculations ◽  
Resonance Effect ◽  
Experimental Studies ◽  
Educational Process ◽  
Resonance Phenomenon ◽  
Power Coefficient ◽  
Motor Circuit ◽  
Three Phase

In this paper, we propose a method to connect a three-phase motor, with windings connected by a star and a phase-shifting capacitor as the third contact, to a single-phase network, with efficient use of electrical energy due to compensation of reactive power and due to effective distribution of the voltage in front of the motor’s oscillating circuit. A resonance phenomenon in an oscillating circuit of the motor is used to compensate for reactive power, i.e. to increase the active power coefficient to the maximum value. A capacitor bank in front of the circuit is used to effectively distribute the voltage at the input of the motor circuit in order to increase the motor voltage from the mains value of 220 V to the nominal value of a three-phase motor of 380 V. A special installation was created for experimental studies. The results of experimental studies, theoretical calculations of the electrical circuit of the installation, as well as the voltage vector diagram of the motor circuit show that the case when voltages on the motor are U = 380 B (UL= UC5= 325.4 B) and U = 392 B (UL= UC5= 375.6 B) most closely corresponds to the resonant state of the motor oscillating circuit. The proposed method was introduced into the educational process as a laboratory work for students of technical specialties of the Almaty University of Energy and Communications, and can be used by designers, inventors, scientists and specialists interested in similar issues to create devices that connect a three-phase star-connected motor to a single-phase network.

scholarly journals Self-oscillations at the frequency of subharmonics in nonlinear electric chains and systems

2019 ◽  
Vol 139 ◽  
pp. 01054 ◽  
Author(s):  
M.I. Ibadullaev ◽  
A.N. Tovbaev ◽  
A.Zh. Esenbekov
Keyword(s):  
Single Phase ◽  
Experimental Studies ◽  
Power Lines ◽  
Equivalent Model ◽  
Critical Parameters ◽  
Steady State Mode ◽  
Power Sources ◽  
Electric Circuits ◽  
Three Phase ◽  
Extensive Class

It is known that the occurrence and existence of autoparametric oscillations (AIC) at the subharmonic frequency (GHC) in power lines (power lines) and in power supply systems is extremely undesirable, since they cause ferroresonant overvoltages at different frequencies. At the same time, there is an extensive class of nonlinear electric circuits in which the excitation of the AIC at the frequency of the SGC forms the basis of frequency-converting devices serving as secondary power sources. It is shown that single-phase-three-phase nonlinear systems are, to one degree or another, equivalent circuits of power lines, the main elements of which are: longitudinal compensation capacitors, transverse compensation reactors, and transformers with non-linear characteristics. The regularities of the excitation of the GCC at the frequency (ω / 3) of the power lines were studied, theoretical and experimental studies of the equivalent model of single-phase-three-phase circuits with nonlinear inductance were carried out. For a theoretical analysis of the steady-state mode of SGK at a frequency (ω / 3) with inductive coupling, the frequency- energy approach is used. The conditions of existence and critical parameters of the circuit are determined, and the mechanism of the appearance of the SGC at the frequency (ω / 3) is also studied.

Experimental Analysis on the Operating Performance of Induction Motor with Unbalance Power Supply Conditions

2014 ◽  
Vol 635-637 ◽  
pp. 1404-1407
Author(s):  
Yuan Xing Zhang ◽  
Fei Li ◽  
Ya Li Shen ◽  
Lei Juan Yang ◽  
Jie Li ◽  
...  
Keyword(s):  
Induction Motor ◽  
Power Supply ◽  
Power Efficiency ◽  
Single Phase ◽  
Reactive Power ◽  
Phase Voltage ◽  
Three Phase ◽  
Unbalanced Voltage ◽  
Negative Sequence Current ◽  
Domestic Appliances

Problems of power quality have been increasingly concerned by the researchers, as the domestic appliances we are usually used are single-phase load, which mainly causes the unbalance of three-phase voltage of power supply. If the induction motor is supplied by three-phase unbalanced voltage, the currents, active and reactive power, efficiency, and losses are affected as the negative-sequence current appears, this paper is emphasized on the induction motor’s characteristics when its’ power supply is three-phase unbalanced voltage by experimental research.

scholarly journals Asymmetric Compensation of Reactive Power Using Thyristor-Controlled Reactors

Symmetry ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 880
Author(s):  
Martynas Šapurov ◽  
Vytautas Bleizgys ◽  
Algirdas Baskys ◽  
Aldas Dervinis ◽  
Edvardas Bielskis ◽  
...  
Keyword(s):  
Experimental Test ◽  
Single Phase ◽  
Test Bench ◽  
Reactive Power ◽  
Low Voltage ◽  
And Topology ◽  
Three Phase ◽  
Thyristor Controlled Reactor ◽  
Utility Grid ◽  
Experimental Test Bench

The thyristor-controlled reactor (TCR) compensator for smooth asymmetric compensation of reactive power in a low-voltage utility grid is proposed in this work. Two different topologies of compensator were investigated: topology based on a single-cored three-phase reactor and topology with separate reactors for every phase. The investigation of the proposed TCR compensator was performed experimentally using a developed experimental test bench for 12 kVAr total reactive power. The obtained results show that employment of separate reactors for every phase allows us to control the reactive power in every phase independently, and that the TCR compensator with three single-phase reactors is suitable for smooth and asymmetric compensation of reactive power in a low-voltage utility grid.

Reactive Power Limits of Single-Phase and Three-Phase DC-Link VSC STATCOMs under Negative-Sequence Voltage and Current

2021 ◽  
Author(s):  
Iosu Marzo ◽  
Jon Andoni Barrena ◽  
Alain Sanchez-Ruiz ◽  
Gonzalo Abad ◽  
Ignacio Muguruza
Keyword(s):  
Single Phase ◽  
Reactive Power ◽  
Negative Sequence ◽  
Three Phase ◽  
Power Limits

THREE-PHASE FOUR-WIRE PV-BASED SERIES HYBRID ACTIVE POWER FILTER FOR POWER QUALITY IMPROVEMENT

2014 ◽  
Vol 23 (10) ◽  
pp. 1450144 ◽  
Author(s):  
M. VIJAYAKUMAR ◽  
S. VIJAYAN
Keyword(s):  
Reactive Power ◽  
Experimental Studies ◽  
Active Power Filter ◽  
Boost Converter ◽  
Active Power ◽  
Solar Irradiation ◽  
Voltage Source ◽  
Power Filter ◽  
Hybrid Active Power Filter ◽  
Three Phase

This paper proposes a photovoltaic (PV)-based three-phase four-wire (3P4W) series hybrid active power filter (SHAPF) it comprises of a series active power filter (SAPF) and an LC shunt passive filter. The proposed system eliminates both the current and voltage harmonics and compensates reactive power, neutral current and voltage interruption. A SAPF demands a source of energy for compensating the voltage sag/swell. This system introduces a new topology for SHAPF utilizes the PV with DC–DC boost converter as a source of DC power for SAPF. The compensation current reference evaluation is based on the twin formulation of the vectorial theory of electrical power theorem with fuzzy logic controller (FLC). The PV array/battery managed DC–DC boost converter is employed to step up the voltage to meet the DC bus voltage requirement of the three-leg voltage source inverter (VSI). The foremost benefit of the proposed system is that, it will provide uninterrupted compensation for the whole day. This system utilizes the renewable energy accordingly saves the energy and shares the load during the solar irradiation available. The simulation and experimental studies are carried out to validate the effectiveness of the proposed PV-SHAPF.

Analysis of Current Optimization Method on Compensation

2014 ◽  
Vol 668-669 ◽  
pp. 665-668
Author(s):  
Bin Su ◽  
Shun Tao ◽  
Xiang Ning Xiao ◽  
Tian Cai Wei
Keyword(s):  
Single Phase ◽  
Reactive Power ◽  
Rapid Development ◽  
Optimization Method ◽  
Simulation Studies ◽  
Three Phase ◽  
Optimal Current ◽  
Definition Of ◽  
Power Electronic Technology ◽  
Mathematical Derivation

Nowadays, with the rapid development of industrial technology especially the power electronic technology, harmonic and reactive power problems are becoming severer. In sinusoidal conditions, there are no controversies on the definition of power quantities. In nonsinusoidal circuits, the traditional definition of active power is still applicable while the definitions of reactive power and apparent power are in controversy. Based on an optimization current decomposing method, this paper derives the expressions of optimal current and compensating current in a single-phase and a three-phase circuit by constructing a Lagrange functions. Based on simulation studies, the compensating effect of the optimization method is analyzed and shown; it can noticeably improve the efficiency of energy transfer in circuit. The paper presents all mathematical derivation of the method and verifies the results based on simulation.

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