Part 2: Reactive Compensation of the Linear Load in Three-Phase Four-Wire Systems Supplied with Asymmetrical Sinusoidal Voltage Following Currents’ Physical Components Theory

2020 ◽  
Vol 11 (4(42)2020) ◽  
pp. 52-64
Author(s):  
Zbigniew SOLJAN ◽  
Keyword(s):  
Single Phase ◽  
Supply Voltage ◽  
Industrial Plant ◽  
Sinusoidal Voltage ◽  
Home Office ◽  
Reactive Compensation ◽  
Load Imbalance ◽  
Power Equation ◽  
Linear Load ◽  
Three Phase

Four-wire systems are the most common ones in everyday life. Electrical installations within the home, office, or industrial plant are mostly four-wire installations. Receivers connected to such a system are mainly single-phase loads, which from the power connection are an unbalanced three-phase load. Apart from, the load imbalance, the supply voltage also has some asymmetry. Voltage asymmetry, load imbalance, the design of reactance compensators are issues that were not simultaneously included in the power equation in fourwire systems. This article presents the mathematical fundamentals of the construction of reactance compensators operating in voltage asymmetry.

Part 1: Decomposition of the Load’s Current in Three-phase Four-wire Systems Supplied with Asymmetrical Sinusoidal Voltage Following Currents’ Physical Components Theory

2020 ◽  
Vol 11 ◽  
pp. 34-42
Author(s):  
Zbigniew SOLJAN ◽  
Keyword(s):  
Single Phase ◽  
Low Voltage ◽  
Supply Voltage ◽  
Sinusoidal Voltage ◽  
Power Equation ◽  
Three Phase ◽  
Unbalanced Voltage ◽  
Wire System ◽  
Phase Asymmetry ◽  
Physical Components

Electricity receivers in low-voltage networks are mainly single-phase loads, which, when grouped within a given consumer, create a three-phase load. Such a replacement three-phase load works in a four-wire system. Besides, under real conditions, the supply voltage has some amplitude and phase asymmetry. Voltage unbalances, load's imbalances are issues that not simultaneously included in the power equation in four-wire systems. This article eliminates the limitations of electrical engineering in this area by deriving the power equation for three-phase loads supplied with unbalanced voltage.

scholarly journals Characteristic and Non-Characteristic Harmonics, Harmonic Cancellations and Relevant International Standards in Variable Speed Drives

2002 ◽  
Vol 7 (1) ◽  
pp. 123
Author(s):  
Syed M. Islam
Keyword(s):  
Single Phase ◽  
Supply Voltage ◽  
International Standards ◽  
Wave Form ◽  
Variable Speed ◽  
Variable Speed Drives ◽  
Front End ◽  
Three Phase ◽  
Research Findings ◽  
Voltage Wave

This paper will present a review of characteristic harmonics in both single phase and three phase drive front end rectifiers, discuss recent research findings in identifying sources and production of non-characteristic harmonics and amplification of harmonic levels when the front end rectifiers are fed from non-ideal supply conditions. Significant amount of triplens may be generated due to unbalances in utility supply voltage wave form and anticipated harmonic levels may vary widely. The paper will also discuss international harmonic standards such as the AS 2279, IEEE 519, and IEC 61000 series applicable to rectifier loads. Finally, the paper will present techniques to reduce harmonic levels by mixing of single phase and three phase non-linear loads resulting from mutual cancellations.  

scholarly journals Control Methods for Single-phase Voltage Supply with VSCs to Feed Nonlinear Loads in Rural Areas

2020 ◽  
Vol 1 (1) ◽  
pp. 33-47
Author(s):  
Walter Julián Gil Gonzalez ◽  
Sara Yulieth Bocanegra ◽  
Federico M. Serra ◽  
Maximiliano Bueno-López ◽  
Guillermo Luciano Magaldi
Keyword(s):  
Rural Areas ◽  
Single Phase ◽  
Hamiltonian Structure ◽  
Tracking Error ◽  
Open Loop ◽  
Voltage Source ◽  
Sinusoidal Voltage ◽  
Nonlinear Loads ◽  
Linear Load ◽  
Voltage Generation

This paper addresses the problem of sinusoidal voltage generation in linear loads using a voltage source inverter (VSI). The port-Hamiltonian structure in open-loop is used to design a passivity-based controller with proportional-integral gains (PI-PBC) in order to develop the control strategy. The main advantage of using passivity-based controllers corresponds to the possibility of guaranteeing asymptotic stability by transforming the trajectory tracking problem into a regulation control one. In addition to the PI-PBC, a linear load estimator is employed based on an integral formulation to determine the value of the equivalent conductance in the load, which reduces the number of current sensors. Numerical validations demonstrate that the sinusoidal voltage provided by the VSI to the load has a tracking error lower than $1~\%$, with harmonic distortions lower than $2.6~\%$, both for voltage and currents in the load. All the simulations were conducted in MATLAB/Simulink using the SimPowerSystems library version 2017a.

Three-phase to Single-phase Matrix Converter for Improvement of Three-phase Voltage Unbalance in Distribution System

2015 ◽  
Vol 135 (3) ◽  
pp. 168-180 ◽  
Author(s):  
Ryota Mizutani ◽  
Hirotaka Koizumi ◽  
Kentaro Hirose ◽  
Kazunari Ishibashi
Keyword(s):  
Distribution System ◽  
Single Phase ◽  
Matrix Converter ◽  
Phase Voltage ◽  
Voltage Unbalance ◽  
Three Phase
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