Modeling and Analysis of Voltage Sag Sources in Distribution Network

2013 ◽  
Vol 765-767 ◽  
pp. 2529-2533
Author(s):  
Lei Zhang ◽  
Jun Liu ◽  
Yan Song Li ◽  
Zhan Sheng Wang ◽  
Chun Xiao Li
Keyword(s):  
Induction Motor ◽  
Analytical Model ◽  
Distribution Network ◽  
Industrial Enterprise ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Typical Structure ◽  
Modeling And Analysis ◽  
Proposed Model ◽  
Main Voltage

The mechanism of voltage sags due to three main voltage sag sources, such as line faults, startup of large induction motor and transformer energization, was analyzed theoretically. Based on the typical structure of the distribution network of a large industrial enterprise, the paper presented a simplified analytical model for voltage sag sources and conducts a test with the above three kinds of voltage sag sources in Matlab/Simulink. The results show the proposed model is correct and suitable for the analysis of distribution network.

scholarly journals Classification of voltage sags according to the severity of the effects on the induction motor

DYNA ◽  
2015 ◽  
Vol 82 (190) ◽  
pp. 96-104 ◽  
Author(s):  
Adolfo Andres Jaramillo Matta ◽  
Luis Guasch Pesquer ◽  
Cesar Leonardo Trujillo Rodriguez
Keyword(s):  
Induction Motor ◽  
Induction Motors ◽  
Initial Point ◽  
Steady States ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Cage Rotor ◽  
Rotor Model

In this paper, symmetrical and unsymmetrical voltage sags are classified according to the severity of the effects produced on the behavior of induction motors, using the double-cage rotor model. The analyzed variables are: current and torque peaks, and speed loss in transient and steady states. The severity of these effects is analyzed with 14640 voltage sags, both at the beginning of the voltage sag and when the voltage is recovered, by changing the type, magnitude, duration, and initial-point-of-wave. Four mechanical torque loads were used for the analysis, three with constant behavior and one with quadratic behavior. The results show the durations and initial-point-of-wave with more severe effects for each type of voltage sag. Finally, a classification that depends on the type of voltage sag and the variable of interest is obtained.

scholarly journals Assessment of unsymmetrical voltage sag effects on AC adjustable speed drives

2009 ◽  
Vol 22 (3) ◽  
pp. 341-360
Author(s):  
Milutin Petronijevic ◽  
Nebojsa Mitrovic ◽  
Vojkan Kostic ◽  
Borislav Jeftenic
Keyword(s):  
Induction Motor ◽  
Control Algorithm ◽  
Motor Drives ◽  
Voltage Sag ◽  
Motor Drive ◽  
Voltage Sags ◽  
Induction Motor Drives ◽  
Adjustable Speed Drives ◽  
Adjustable Speed ◽  
Theoretical Results

This paper analyses the influence of unsymmetrical voltage sags on the increase of torque and speed deviation induction motor adjustable speed drives. The three following general types of induction motor drives control are analyzed: scalar controlled (V/Hz), rotor-field-oriented (RFO) and direct-torque-controlled(DTC). The analytical expression for variations of dc link voltage incorporated into the corresponding drive models and formulas for assessment of current/torque deviation are derived depending on the applied control algorithm. Afterwards, the presented theoretical results for the deterioration of motor drive performance due to voltage sags are validated experimentally. Measurements of sag-caused mechanical vibrations are used for the additional verification of the obtained results. .

Voltage Sag Assessment of Distribution Network with Distributed Generations

2013 ◽  
Vol 441 ◽  
pp. 169-173
Author(s):  
Shuang Yin Dai ◽  
Qiong Lin Li ◽  
Shu Ming Liu
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Output Power ◽  
Control Strategy ◽  
Distribution Network ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Distributed Generations ◽  
Machine Type ◽  
Typical Distribution

Voltage sag assessment of distribution network with DGs based on Monte Carlo method is researched in this paper. Models of synchronous machine type DG and inverter type DG are established respectively; then a typical distribution network with DGs is simulated based on PSCAD/EMTDC. Impacts of type, control strategy, output power and location of DG on voltage sags are discussed based on several simulation examples. The results show that inverter type DG has certain capability of suppressing voltage sags and can reduce the frequency of voltage sags in distribution network and the impacts are depend on its type, control strategy, output power and location.

Effects of Different Voltage Sag Types on Induction Motor

2015 ◽  
Vol 793 ◽  
pp. 262-266
Author(s):  
Surya Hardi ◽  
Muhd. Hafizi ◽  
Muzamir Isa ◽  
Syafrudin Masri ◽  
Mohd Azrik bin Ruslan ◽  
...  
Keyword(s):  
Induction Motor ◽  
Experimental Test ◽  
Great Influence ◽  
Type A ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Motor Speed ◽  
Speed Variation ◽  
Normal Current ◽  
Recovery Voltage

This paper analyzes effects caused by voltage sag types A, B, C and D on induction motor based on experimental test. The effect can be investigated in term the current peaks and speed variation. The magnitudes depend on magnitude of sag and duration, voltage sag types, during and recovery voltage sag. Several of voltage sag characteristics have been conducted in different magnitude, duration and sag types. The results show that the current peaks generated reach more than 4 times of normal current and it was achieved at recovery voltage instant. Sag magnitude has great influence on the current peak but sag duration is not significantly. Type A voltage sag only can cause the motor stop running and it was achieved when it was subjected to sag magnitude of 10% and 6s in duration. The motor stops running in shorter duration when it was subjected to interruption with sag duration of 4s. Therefore voltage sag of type A lead to more severe on induction motor if compared with other sag type. This is according to number of phase that experience sag. The magnitude and duration of voltage sags have influenced significantly on the motor speed only for low sag magnitude and long sag duration.

scholarly journals Conversores de freqüencia VSI-PWM submetidos a afundamentos temporários de tensão ("voltage sags")

2003 ◽  
Vol 14 (1) ◽  
pp. 50-57
Author(s):  
Paulo C. A. Leão ◽  
José C. de Oliveira ◽  
Kleiber D. Rodrigues
Keyword(s):  
Voltage Sag ◽  
Voltage Sags

Este artigo tem por objetivo analisar a interdependência entre a operação de conversores de freqüência tipo VSI-PWM e uma das manifestações mais comuns para a perda de qualidade de um suprimento elétrico, qual seja, a ocorrência do fenômeno denominado por afundamento temporário de tensão ou "voltage sag". São apresentados resultados de simulações, realizadas no Simulador Saber, de um sistema típico submetido a afundamentos de tensões simétricos e assimétricos. Resultados de ensaios em laboratório também são fornecidos com vistas à validação dos resultados computacionais. Aspectos relacionados com a capacidade "ride-through" dos conversores e correspondentes arranjos de proteção são também considerados.

Adaptive Contactor - A New Scheme to Improve Induction Motor Immunity to Voltage Sags

2020 ◽  
pp. 1-1
Author(s):  
Lingxiang Yao ◽  
Xianyong Xiao ◽  
Yang Wang ◽  
Wilsun Xu
Keyword(s):  
Induction Motor ◽  
Voltage Sags

Voltage Sag Evaluation Method of a Real Distribution System Based on a Connection Number Model

2013 ◽  
Vol 341-342 ◽  
pp. 1363-1366
Author(s):  
Lang Bai ◽  
Le Yu
Keyword(s):  
Distribution System ◽  
Evaluation Method ◽  
Assessment Model ◽  
Voltage Sag ◽  
Voltage Sags ◽  
Connection Number ◽  
Reliability Parameters ◽  
Real Distribution ◽  
System Components ◽  
Simulation Results

The evaluation results of power system are greatly influenced by the reliability parameters and uncertainty of system components. The connection number assessment model and an approach have been presented to assess the occurrence frequency due to voltage sags. The proposed method had been applied to a real distribution system. Compared with the interval number method, the simulation results have shown that this method is simple and flexible.

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