A Study on the Voltage Unbalance and THD Analysis Method using Actual Measured Signals in the AC Railway System

2021 ◽  
Vol 70 (12) ◽  
pp. 2046-2051
Author(s):  
Myung-Hwan Min ◽  
Jae-Young Hong ◽  
Yu-Ran Go ◽  
Tea-Pung An ◽  
Tea-Hoon Lee
Keyword(s):  
Analysis Method ◽  
Voltage Unbalance ◽  
Railway System

Study on Voltage Unbalance Improvement Using SFCL in Power Feed Network With Electric Railway System

2013 ◽  
Vol 23 (3) ◽  
pp. 3601004-3601004 ◽  
Author(s):  
Jae-Sun Huh ◽  
Hee-Sang Shin ◽  
Woon-Sik Moon ◽  
Byoung-Wook Kang ◽  
Jae-Chul Kim
Keyword(s):  
Voltage Unbalance ◽  
Feed Network ◽  
Railway System ◽  
Electric Railway

scholarly journals Voltage Unbalance, Power Factor and Losses Optimization in Electrified Railways Using an Electronic Balancer

Electricity ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 554-572
Author(s):  
António P. Martins ◽  
Pedro Rodrigues ◽  
Mahmoud Hassan ◽  
Vítor A. Morais
Keyword(s):  
Low Power ◽  
Power Factor ◽  
Electric Energy ◽  
Field Measurements ◽  
Electric Grid ◽  
Voltage Unbalance ◽  
Three Phase ◽  
Railway System ◽  
Regenerative Energy ◽  
Electrified Railways

Unbalanced currents, low power factor and high losses contribute to increasing the bill infrastructure managers must pay to the TSO/DSO operator that supplies electric energy to the railway system. Additionally, if regenerative energy coming from braking regimes is not allowed to be injected into the grid or even is penalized when it occurs, then the optimization of those parameters must be pursued. One of the possible measures that can be taken to counteract those phenomena is the installation of electronic balancers in heavy loaded substations in order to optimize the interface to the three-phase electric grid. This paper shows the benefit of such use taking examples from real conditions and realistic simulations assumed equivalent to field measurements.

scholarly journals Improve the Three-phase Unbalance Rate of Railway System Under 2% By Three Kinds of Special Transformer Wiring

2021 ◽  
Author(s):  
Chien-Hsu Chen ◽  
Chin E. Lin
Keyword(s):  
Service Life ◽  
Load Capacity ◽  
Railway Vehicle ◽  
Voltage Unbalance ◽  
The Past ◽  
Three Phase ◽  
Railway System ◽  
Ieee Standard ◽  
Model Derivation ◽  
The Cost

Because imbalanced power will cause the loss of the propulsion motor of the railway vehicle, and the increase in temperature will shorten the service life of the electric vehicle. Not only this, but also increase the cost of electricity and maintenance. In the past, the industry only focused on methods to improve power quality such as load capacity, relay setting, and harmonic resolution. Now, the consider of three-phase unbalance rate (TPUR) must be applied. I propose special transformers wiring (STW) to improve the three unbalance rates and provide different transformer wiring methods. According to the IEEE Committee, in the future, power companies will need to install balanced relay stations to improve three-phase unbalance rate. the internal regulations of Taipower must be less than 4.5% (voltage unbalance rate (NPSUR)of 2.5% and motor temperature rise of 12.5%). the derivation of the transformer "three-phase unbalance rate" model is the focus of the railway system. This research is based on the model derivation of different wiring methods to improve the hot problem caused by the three-phase imbalance and improve the service life of the train. And pointed out that Scott, Le-Blanc, Modified-Woodbridge three wiring methods can be applied to future railway system routes to improve the three-phase unbalance rate, in line with the IEEE standard of less than 2%.

Research on the Safety Evaluation Method of Railway Operation System

2011 ◽  
Vol 383-390 ◽  
pp. 4585-4593
Author(s):  
Xue Mei Xiao ◽  
Yan Hui Wang ◽  
Yuan Ling
Keyword(s):  
Evaluation Method ◽  
Safety Evaluation ◽  
Order Relation ◽  
Evaluation Index System ◽  
Evaluation Index ◽  
Analysis Method ◽  
Operation System ◽  
Chain Analysis ◽  
Railway System ◽  
Railway Operation

Based on the analysis of railway accidents and safe operation, a dynamic multi-ring evaluation index (DMEI), whose structure was dynamic and reconfigurable logically, was proposed in the paper. And, Based on the structure of this evaluation index system, an analysis method based on accident chain analysis, which was improved from the order relation analysis method, was proposed in this paper. The improved method can be applied to the safety assessment of railway operation system. Last, by using the safety evaluation method proposed in this paper, the evaluation simulation of railway system operation was done, and then the evaluation results were analyzed and explained in theory.

scholarly journals Improve the Three-Phase Unbalance Rate of Railway System Under 2% By Three Kinds of Special Transformer Wiring

2021 ◽  
Author(s):  
Hsu Chien Chen ◽  
Shir Kuan Lin ◽  
Chin-E. Lin
Keyword(s):  
Service Life ◽  
Load Capacity ◽  
Railway Vehicle ◽  
Voltage Unbalance ◽  
The Past ◽  
Three Phase ◽  
Railway System ◽  
Ieee Standard ◽  
Model Derivation ◽  
The Cost

Because imbalanced power will cause the loss of the propulsion motor of the railway vehicle, and the increase in temperature will shorten the service life of the electric vehicle. Not only this, but also increase the cost of electricity and maintenance. In the past, the industry only focused on methods to improve power quality such as load capacity, relay setting, and harmonic resolution. Now, the consider of three-phase unbalance rate (TPUR) must be applied. I propose special transformers wiring (STW) to improve the three unbalance rates and provide different transformer wiring methods. According to the IEEE Committee, in the future, power companies will need to install balanced relay stations to improve three-phase unbalance rate. the internal regulations of Taipower must be less than 4.5% (voltage unbalance rate (NPSUR)of 2.5% and motor temperature rise of 12.5%). the derivation of the transformer "three-phase unbalance rate" model is the focus of the railway system. This research is based on the model derivation of different wiring methods to improve the hot problem caused by the three-phase imbalance and improve the service life of the train. And pointed out that Scott, Le-Blanc, Modified-Woodbridge three wiring methods can be applied to future railway system routes to improve the three-phase unbalance rate, in line with the IEEE standard of less than 2%.

Analysis of Voltage Unbalance Based on Domestic and IEC Standard in AC Electrical Railway System

2019 ◽  
Vol 68 (12) ◽  
pp. 1646-1651
Author(s):  
Myung-Hwan Min ◽  
Yu-Ran Go ◽  
Tae-Pung An ◽  
Tae-Hoon Lee ◽  
Byeong-Gon Lee
Keyword(s):  
Voltage Unbalance ◽  
Railway System

scholarly journals RAILWAY SYSTEM IMPACT ON VOLTAGE QUALITY AT THE LEVEL OF THE CROATIAN TRANSMISSION NETWORK

2020 ◽  
Vol 69 (2) ◽  
pp. 19-23
Author(s):  
Denisa Galzina ◽  
Eraldo Banovac ◽  
Tomislav Tomiša
Keyword(s):  
Harmonic Distortion ◽  
Quality Measurement ◽  
Theoretical Description ◽  
Transmission Network ◽  
Two Phase ◽  
Voltage Unbalance ◽  
Railway Systems ◽  
Voltage Quality ◽  
Railway System ◽  
The Impact

Railway systems are single-phase loads, connected to two-phase of the three-phase supply network. Therefore, they negatively affect the voltage quality, primarily the voltage unbalance. In addition to voltage unbalance, railway systems inject current harmonics into the network due to controllable diode or thyristor drives used to operate the train. The paper gives a short theoretical description of the harmonic distortion and the voltage unbalance as well as the results of the voltage quality measurement. Moreover, the paper shows the impact of the railway system on the transmission network in the case that the facilities are connected to the 110 kV voltage level.

Sign in / Sign up

Export Citation Format

Share Document