Modelling and Analysis of 18-Pulse Rectification System for DC Traction Power Substation

2021 ◽  
Author(s):  
A. I. M. Shukran ◽  
C. L. Toh ◽  
C. W. Tan
Keyword(s):  
Power Substation ◽  
Traction Power

scholarly journals Traction Power Substation Load Analysis with Various Train Operating Styles and Substation Fault Modes

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2788
Author(s):  
Zhongbei Tian ◽  
Ning Zhao ◽  
Stuart Hillmansen ◽  
Shuai Su ◽  
Chenglin Wen
Keyword(s):  
Power Supply ◽  
Normal Operation ◽  
Supply Network ◽  
Power Network ◽  
Power Load ◽  
Power Substation ◽  
Railway Traction ◽  
Train Operation ◽  
The Impact ◽  
Traction Power

The simulation of railway systems plays a key role in designing the traction power supply network, managing the train operation, and making changes to timetables. Various simulation technologies have been developed to study the railway traction power network and train operation independently. However, the interactions between the load performance, train operation, and fault conditions are not fully understood. This paper proposes a mathematical modeling method to simulate the railway traction power network with a consideration of a multi-train operation, driving controls, under-voltage traction, and substation fault modes. The network voltage, power load demands, and energy consumption according to the existing operation are studied. The hotspots of the power supply network are identified based on an evaluation of the train operation and power demand. The impact of traction power substation (TPSS) outage and a short circuit on the power supply network have been simulated and analyzed. The simulation results have been analyzed and compared with those of a normal operation. A case study based on a practical metro line in Singapore is developed to illustrate the power network evaluation performance.

scholarly journals Design a nine-level modular multilevel converter for DC railway electrification system

2020 ◽  
Vol 11 (1) ◽  
pp. 151
Author(s):  
Chuen Ling Toh ◽  
P. C. Ooi
Keyword(s):  
Pulse Width Modulation ◽  
Harmonic Distortion ◽  
Voltage Source ◽  
Modular Multilevel Converter ◽  
Centralized Control ◽  
Multilevel Converter ◽  
Power Substation ◽  
Harmonic Voltage ◽  
Traction Power

<p>A recuperating converter is highly demanded in traction power substation to deliver the braking energy generated by a traction vehicle. Conventional voltage source inverter had been implemented in the traction power station. However, large ac line filters must be installed to improve the quality of ac voltages and currents. This paper proposes to install a nine-level Modular Multilevel Converter (MMC) as a recuperating converter. The main aim is to eliminate the need of ac line filters while producing good quality of ac voltage and current waveforms. The MMC is designed and modelled using MATLAB/Simulink Simulation tool. A centralized control of balancing all the sub-module capacitor voltage level is proposed with Third Harmonic Voltage Injection Level Shifted Pulse Width Modulation (THVI-LSPWM) technique. The simulation results prove that with the application of MMC, good quality of ac voltages and currents are being produced. The Total Harmonic Distortion indexes are found less than 3.5 % without using any ac line filters in the system. In addition, the classic DC link capacitance has also being eliminated. </p>

scholarly journals WMATA Wayside Energy Storage Demonstration Project

2018 ◽  
Author(s):  
Jian G. Yu ◽  
Moustapha Ouattara
Keyword(s):  
Power System ◽  
Measurement Data ◽  
Demonstration Project ◽  
Battery Power ◽  
Power Substation ◽  
Peak Power Reduction ◽  
Emergency Power ◽  
Service Conditions ◽  
Voltage Support ◽  
Traction Power

A 2MW Battery Power System (BPS) was installed and tested in a traction power substation on the Orange Line of the Washington Metropolitan Area Transit Authority (WMATA), as a demonstration project. Measurement data were obtained under normal revenue service conditions. In addition, the same installation was tested as an emergency power source to move trains to desired destinations when the traction power system was under a simulated blackout situation. The results were analyzed to assess the ability of the BPS installation to achieve energy saving, peak power reduction, train voltage support and emergency power provision. This paper describes the findings from this demonstration project and the follow-on efforts in WMATA.

scholarly journals DC traction power substation using eighteen-pulse rectifier transformer system

2021 ◽  
Vol 12 (4) ◽  
pp. 2284
Author(s):  
Chuen Ling Toh ◽  
Chee Wei Tan
Keyword(s):  
Simulation Study ◽  
Harmonic Distortion ◽  
Phase Shifting ◽  
Dc Voltage ◽  
Grid Current ◽  
Power Substation ◽  
Research Findings ◽  
Distortion Index ◽  
Current Ripple ◽  
Traction Power

<span lang="EN-US">Twelve-pulse rectification system had been widely integrated in today’s DC traction power sub-station (DC-TPSS). This configuration had successfully mitigated low order harmonic distortion. As some research findings had confirmed that the dc voltage and current ripple factors may further minimize by increasing the number of rectification pulses to 18, 24, or 36. This paper had presented a simulation study to investigate the prospect of implementing an eighteen-pulse rectification system in a DC-TPSS. The theory of phase-shifting transformer used to produce an 18-pulse rectifier is presented with simulation verification. Simulation result shows that 3.69% of grid current distortion index is recorded without installing any filters. In addition, the dc voltage and current ripple may also be further reduced for about 30% compared to a conventional twelve-pulse rectification system.</span>

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