Research of Voltage Sag Propagation through Transformers

2013 ◽  
Vol 706-708 ◽  
pp. 1504-1510
Author(s):  
Xi Nian Li ◽  
Yan Wen Wang
Keyword(s):  
Power Quality ◽  
Transfer Matrix ◽  
Critical Power ◽  
Analytical Calculation ◽  
Single Line ◽  
Voltage Sag ◽  
Symmetrical Components ◽  
Ground Fault ◽  
In Series

Voltage sag is one of the most critical power quality problems. This paper calculates voltage sag propagation through YNd11 and Dyn11 winding connected transformers in series using symmetrical components, thus obtaining the voltage transfer matrix. Then the voltage sag propagation of single line-to-ground fault is computed using the transfer matrix. Simulation result proves the correctness of the analytical calculation, providing reference for the further study of voltage sag influence and estimation.

On the Selection of Bypassing Schemes Affecting the Secondary Arc Current and TRV in Series Compensated Lines

2012 ◽  
Vol 13 (5) ◽  
Author(s):  
Zeynab Zandi ◽  
Keyhan Sheshyekani ◽  
Ebrahim Afjei
Keyword(s):  
Transmission Lines ◽  
Frequency Domain Analysis ◽  
Capacitive Coupling ◽  
System Stability ◽  
Single Line ◽  
Arc Model ◽  
Ground Fault ◽  
In Series ◽  
Arc Current ◽  
Recovery Voltage

Abstract This paper investigates the effect of different bypassing schemes and grounding methods on the secondary arc current and the transient recovery voltage (TRV) of series compensated transmission lines. It is known that in series compensated lines, the peak value of the TRV may exceed the insulation strength. Furthermore, a secondary arc current is generated during a single line to ground fault mainly affected by the capacitive coupling between the healthy lines and the faulted line and can persist for seconds. The steadiness of secondary arc current prevents line reclosers from having a prompt closing to fulfill the system stability. This paper discusses different scenarios that can be employed to limit the secondary arc current consistency and to suppress a severe TRV during a single line to ground fault. A frequency domain analysis is conducted to better understand the nature of the secondary arc current. It is noted that an accurate arc model based upon the Kiziclay’s arc model is used in the simulations.

scholarly journals Classification of Voltage Sag Propagation under Double Line to Ground Fault on a Low Voltage Distribution Power Network

2021 ◽  
Vol 11 (2) ◽  
pp. 6949-6955
Author(s):  
A. K. Junejo ◽  
M. A. Koondhar ◽  
M. A. Memon ◽  
I. A. Channa ◽  
S. A. A. S. Bukhari
Keyword(s):  
Power Quality ◽  
Low Voltage ◽  
Voltage Drop ◽  
Voltage Sag ◽  
Power Network ◽  
Voltage Transformer ◽  
Double Line ◽  
Ground Fault ◽  
Zero Sequence ◽  
Distribution Power Network

The key issue of the voltage-sag propagation on the different types of winding connections for the low voltage transformer in the distribution power network is considered in this study. The issues of voltage sag propagation depend upon the type of asymmetrical fault and the connection of the transformer windings. In this paper, the double line to ground fault is adopted for the voltage sag characterization. The depiction of the sage propagation is an outcome of the zero sequence components. Voltage sag propagation detection can be used to improve the power quality of the system. The obtained results reveal the characteristics of the voltage drop propagation from the primary to the secondary winding of the transformer throughout different connection. The implemented method will help analyze the Power Quality (PQ) problem in terms of voltage sag of the distributed transmission networks of the power system.

scholarly journals The enhancement of power quality for the distribution system via dynamic voltage restorer

2020 ◽  
Vol 11 (3) ◽  
pp. 1588
Author(s):  
Ali Basim Mohammed ◽  
Mohd Aifaa Mohd Ariff
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Sliding Mode ◽  
Harmonic Distortion ◽  
Voltage Sag ◽  
Terminal Sliding Mode ◽  
Dynamic Voltage Restorer ◽  
Voltage Restorer ◽  
Dynamic Voltage ◽  
In Series

This paper represents a new configuration of the dynamic voltage restorer consists of approximate classical sliding mode differentiator (ACSMD) with the terminal sliding mode controller (TSMC) as the nonlinear sliding variable. In this study, the proposed structure of the DVR is utilized to maintain the magnitude of the load voltage at a constant value, maintain the system total harmonic distortion (THD), boost the robustness property and minimize the steady-state error. The power quality has received more interest due to the implementation of various industrial devices and critical loads at the distribution side. Nowadays, the main challenges in power quality in the system are voltage sags/swells, harmonics and voltage imbalance. Various devices are utilized to address these challenges. The dynamic voltage restorer is one of these devices. It is connected in series with the distribution system and injects a proper voltage magnitude to maintain the voltage load at the constant value. In this paper, the DVR model with the ASMF and TSMC is implemented in using MATLAB/Simulink. The proposed controller is evaluated using the standard voltage sag indices.

scholarly journals Research and Control of STATCOM using ANN and ANFIS

2019 ◽  
Vol 8 (2S11) ◽  
pp. 4172-4181
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Distribution Systems ◽  
Fuzzy Controller ◽  
Voltage Sag ◽  
Power Electronic ◽  
Active Power Filters ◽  
Wide Range ◽  
In Series ◽  
Power Application

Power quality issues are of great concern in transmission and distribution system now a day due to the sensitive nature of the loads. The sensitive nature of the load increases with the advent of power electronic technology. It has become important, particularly, with the introduction of sophisticated devices, whose performance is very sensitive to the quality of power supply that results in a failure of end use equipment. In distribution systems voltage sag are more prominent. Power quality problems cannot be eliminated by using conventional filters. Therefore power electronic based Active Power Filters (APF) are most commonly used now a days. Voltage sag problems are the most frequently occurring and detrimental power quality problems. At present, a wide range of very flexible controllers, are emerging for custom power application to correcting the voltage sag in a distributed system. Among these controllers STATCOM are most effective devices, along with controlling methodology Mamdani Fuzzy Controller (MFC), ANN and ANFIS controllers. A STATCOM inject the voltage in series with the system voltage and a STATCOM injects a current into the system to correct the voltage sag. In their existing system they should be performance of STATCOM using PI controller showed to be better performance for solving voltage sag problem. But we are going to propose the ANN and ANFIS on STATCOM in order to increase the efficiency and their better performance to rectify the power quality problems.

scholarly journals Single-Line-to-Ground Fault Location in Resonant Grounded Systems Based on Fault Distortions

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Yougen Chen ◽  
Junbo Yin ◽  
Zhiyong Li ◽  
Renyong Wei
Keyword(s):  
Fault Location ◽  
Single Line ◽  
Ground Fault

scholarly journals Mitigation of Voltage Dip and Voltage Flickering by Multilevel D-STATCOM

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
M. S. Ballal ◽  
H. M. Suryawanshi ◽  
T. Venkateswara Reddy
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Reactive Power ◽  
Distribution Network ◽  
Voltage Sag ◽  
Service Interruptions ◽  
Flexible Ac Transmission ◽  
Voltage Dip ◽  
Basic Power ◽  
Ac Transmission

The basic power quality problems in the distribution network are voltage sag (dip), voltage flickering, and the service interruptions. STATCOM is a Flexible AC Transmission Systems (FACTS) technology device which can independently control the flow of reactive power. This paper presents the simulation and analysis of a STATCOM for voltage dip and voltage flickering mitigation. Simulations are carried out in MATLAB/Simulink to validate the performance of the STATCOM. A comparison between the six-pulse inverter and the five-level diode-clamped inverter is carried out for the performance of 66/11 KV distribution system.

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