Analysis of harmonic amplification and voltage SAG induced by inrush current and the suppression measures in the early stage of UHV network

2021 ◽  
Author(s):  
H. Yanan ◽  
Z. Bin ◽  
J. Hongli ◽  
Z. Peipeng
Keyword(s):  
Early Stage ◽  
Voltage Sag ◽  
Inrush Current

Performance Evaluation of Dynamic Voltage Restorer Based on Transformer-based Z Source Inverter

2017 ◽  
Vol 8 (3) ◽  
pp. 1101
Author(s):  
Deshpande Chinmay V. ◽  
Deshpande Chaitanya V. ◽  
Deokar Sanjay A.
Keyword(s):  
Current Source ◽  
Control Technique ◽  
Voltage Source ◽  
Voltage Sag ◽  
Inrush Current ◽  
Voltage Source Inverter ◽  
Reactive Component ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Dynamic Voltage

In this paper, latest technology is introduced in substitution to conventional voltage and current type inverter with Transformer based impedance (Z) source inverter in voltage sag assessment and mitigation and compared with voltage source inverter based dynamic voltage restorer. Transformer based impedance source inverters (Trans-Z source inverters) are newly proposed inverters that can be used to overcome downside of voltage source inverter, current source inverter and impedance source (Z-source) inverter. T-Z source inverter consists of transformer with high frequency and low leakage inductance along with low reactive component compared with conventional Z source inverter. In case of T-Z source inverter, voltage stress throughout Z-source capacitor is reduced along with inrush current limitation at startup. This paper presents modeling of T-Z source inverter based dynamic voltage restorer using MATLAB/SIMULINK software along with its THD analysis which is compared with VSI based dynamic voltage restorer. Here abc to dq0 control algorithm is employed. The control technique which is employed for simulation shows excellent results for voltage sag and swell compensation.

Transformer Inrush Current Mitigation for Series Voltage Sag Compensator

2017 ◽  
Vol 48 (4) ◽  
pp. 187-192
Author(s):  
Anil Kumar Pathak ◽  
◽  
A.K Jhala ◽  
Pramod Kumar Rathore
Keyword(s):  
Voltage Sag ◽  
Inrush Current

A Method to Estimate Voltage Sag Caused by Transformer Excitation Inrush Current

2014 ◽  
Vol 494-495 ◽  
pp. 1418-1423
Author(s):  
Jin Hao Wang ◽  
Chao Ying Yang ◽  
Guang Qi Mu ◽  
Xiao Qin Wu
Keyword(s):  
Magnetic Flux ◽  
Decay Time ◽  
Magnetization Curve ◽  
Voltage Sag ◽  
Inrush Current ◽  
Curve Segment ◽  
Linear Features ◽  
Transformer Core ◽  
Curve Equation ◽  
Nonlinear Magnetization

Due to excitation inrush current, no-load transformer accesses system can cause different degree of voltage sag. Therefore presents a method to estimate voltage sag caused by closing no-load transformer. Firstly, accord to the point of saturation magnetic flux and transformer core general single value curve equation to establish general nonlinear magnetization curve. Use the linear features of saturated magnetization curve segment to estimate the maximum inrush current and calculate the maximum depth of voltage sag. According to the magnetic flux decay time to estimate the duration of voltage sag. Simulate closing no-load transformer in a 10kV distribution network, and compare the simulated result with the calculated result. The results show that the proposed method is validity and accuracy.

A Method to Estimate Voltage Sag Caused by Transformer Excitation Inrush Current

2014 ◽  
Vol 494-495 ◽  
pp. 1491-1495
Author(s):  
Ai Qiang Pan ◽  
Ling Luo ◽  
Jia Pei Jin ◽  
Xiao Qing Wu
Keyword(s):  
Magnetic Flux ◽  
Decay Time ◽  
Magnetization Curve ◽  
Voltage Sag ◽  
Inrush Current ◽  
Curve Segment ◽  
Linear Features ◽  
Transformer Core ◽  
Curve Equation ◽  
Nonlinear Magnetization

Due to excitation inrush current, no-load transformer accesses system can cause different degree of voltage sag. Therefore presents a method to estimate voltage sag caused by closing no-load transformer. Firstly, accord to the point of saturation magnetic flux and transformer core general single value curve equation to establish general nonlinear magnetization curve. Use the linear features of saturated magnetization curve segment to estimate the maximum inrush current and calculate the maximum depth of voltage sag. According to the magnetic flux decay time to estimate the duration of voltage sag. Simulate closing no-load transformer in a 10kV distribution network, and compare the simulated result with the calculated result. The results show that the proposed method is validity and accuracy.

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