To estimation of the voltage level reliability in a direct current traction network

Innotrans ◽  
2017 ◽  
pp. 60-64
Author(s):  
Dmitryi V. Lesnikov ◽  
◽  
Anatoliy A. Pyshkin ◽  
Keyword(s):  
Direct Current ◽  
Voltage Level ◽  
Traction Network

Mathematical Simulation of Electrical Interference of a 24-kV Direct-Current Traction Network on Adjacent Lines

2019 ◽  
Vol 90 (10) ◽  
pp. 682-684
Author(s):  
A. N. Marikin ◽  
E. S. Mushkov ◽  
M. A. Ivanov ◽  
A. V. Agunov ◽  
I. A. Ivanov
Keyword(s):  
Mathematical Simulation ◽  
Direct Current ◽  
Traction Network ◽  
Electrical Interference

scholarly journals Performance evaluation of SEPIC, Luo and ZETA converter

2019 ◽  
Vol 10 (1) ◽  
pp. 374 ◽  
Author(s):  
Niranjana Siddharthan ◽  
Baskaran Balasubramanian
Keyword(s):  
Performance Evaluation ◽  
Direct Current ◽  
Output Voltage ◽  
Input Voltage ◽  
Power Supplies ◽  
Voltage Level ◽  
Switching Losses ◽  
Switched Mode Power Supplies ◽  
Constant Output ◽  
Voltage Switching

<p><span>DC-DC converters are devices which convert direct current (DC) from one voltage level to another by changing the duty cycle of the main switches in the circuits. These converters are widely used in switched mode power supplies and it is important to supply a constant output voltage, regardless of disturbances on the input voltage. In this work, the performance of three different converters such as Single-Ended Primary-Inductance Converter (SEPIC), Luo converter and ZETA converter have been analyzed. Further, the parameters values such as ripple voltage, switching losses and efficiency of the proposed three different converters were compared with each other. Also, the simulation work has been carried out using MATLAB/SIMULINK software. From the comparison of obtained results, it is observed that the ZETA converter has high significance than the SEPIC and Luo converter.</span></p>

Optimization specificities of electric propulsion power supply subsystem on railway transport

2018 ◽  
pp. 414-425
Author(s):  
Alexander Marikin ◽  
Kseniya Stepanova
Keyword(s):  
Electric Power ◽  
High Voltage ◽  
Direct Current ◽  
Power Supply ◽  
Electric Propulsion ◽  
High Speed ◽  
Practical Importance ◽  
Voltage Level ◽  
Electric Power Supply ◽  
High Voltage Direct Current

Objective: To assess the basic factors, innovative technologies, on the basis of which an integrated network of electrified lines of high-speed rail is to be created in Russia. Methods: Optimization of the traction power supply system according to characteristic criteria of resources and energy efficiency minimization. Results: Quality indices of power supply of hauling operations, voltage level of collectors for different electric propulsion systems with direct and single-phase alternating current were analyzed. The key factors, significantly influencing the performance indices, are the voltage level and type of current of an electric powered network. It was shown that the system of electric propulsion is a promissory system and possesses the best competitiveness indices, as its electric power supply subsystem is functioning on high-voltage direct current with the use of a 24 kW direct current electric stock on the basis of a new multipurpose generation converting complex. Practical importance: The suggested justification method of electrification variant by means of a dependence diagram depicting spacing between substations and catenary wire section makes it possible to justify a competitive high-voltage direct current electric propulsion system during the design of electric power infrastructure for busy railway lines.

scholarly journals A New High Voltage Gain DC to DC Converter with Low Voltage Stress for Energy Storage System Application

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 2067
Author(s):  
Javed Ahmad ◽  
Chang-Hua Lin ◽  
Mohammad Zaid ◽  
Adil Sarwar ◽  
Shafiq Ahmad ◽  
...  
Keyword(s):  
Energy Storage ◽  
Direct Current ◽  
Energy Demand ◽  
Large Scale ◽  
Low Voltage ◽  
Boost Converter ◽  
Voltage Gain ◽  
Distributed Resources ◽  
Voltage Level ◽  
Power Sources

Increasing energy demand globally has led to exploring ways of utilizing renewable resources for sustainable development. More recently, the integration of renewable distributed resources in small- and large-scale grid has been seriously researched. Development in renewable power sources and its integration with the grid require voltage level conversion to match the grid/micro-grid level. The voltage level conversion is brought about by employing Direct Current-Direct Current (DC-DC) converters with boosting features. The paper presents a wide gain range DC-DC boost converter with a low-stress on switching devices. The proposed converter’s voltage gain is high compared with the conventional quadratic boost converter and other recently developed high gain boost converters. The topology has been compared with recently proposed topologies, and comparative analysis based on various performance parameters has shown that the topology is suitable for renewable and sustainable energy storage and grid integration. The power loss analysis has been done by incorporating the switching and conduction losses. A hardware prototype of 150 W has been developed to validate the converter’s performance in steady-state as well as in dynamic conditions.

scholarly journals ESTIMATE OF VOLTAGE QUALITY ON TRACTION SUBSTATION BUSES OF 27.5 kV WITH LONGITUDINAL CAPACITIVE COMPENSATION DEVICE

2020 ◽  
Vol 2020 (3) ◽  
pp. 11-20
Author(s):  
Svetlana Makasheva ◽  
Pavel Pinchukov ◽  
Aleksandr Mamaev ◽  
Sergey Terleckiy
Keyword(s):  
Electric Power ◽  
Power Supply ◽  
Distribution Density ◽  
Electric Energy ◽  
Voltage Level ◽  
Traction Substation ◽  
Traction Network ◽  
Electric Power Quality ◽  
Compensation Device ◽  
Harmonic Components

The paper is dedicated to the investigation of electric energy quality in AC traction network. The object of investigations is voltage in the AC traction network on buses of 27.5 kV in the AC functioning substation. The probabilistic-statistical value of the voltage level and values of electric energy quality according to voltage non-sinusoidality is under fulfillment. There are shown numerical characteristics and histograms of the distribution density of values under analysis for two operation modes of the AC traction substation – switching on and off of the longitudinal capacitive compensation device formed on the basis of natural measurements. The probabilistic-statistical processing of natural measurements results in power supply arms of the functioning traction substation located in the Far-East of the Russian Federation is carried out. The analysis results are shown as distribution density histograms of random values according to the standard law and in a table form. The longitudinal compensation device impact upon quality values of electric power according to the voltage is under consideration. The calculated indices of electric power quality at the traction substation are compared with the requirements of GOST 32144-2013 in force. It is mentioned that upon buses of 27.5 kV of the traction substation both in the mode of UPK switching on, and in the mode of its switching off the electric power quality by the factor of voltage harmonic components does not satisfy the requirements of GOST 32144-2013 in a number of harmonics. On the basis of the complex estimate of voltage parameters there is drawn a conclusion of the positive impact of longitudinal capacitive compensation devices upon voltage level and the absence of a distinct effect upon a harmonic structure of voltage in a traction network at longitudinal compensation switching on. The conclusion is drawn about filtration expediency of voltage highest harmonic components in power supply arms of the traction substation to bring quality indices on voltage non-sinusoidality to the requirements of the standard in force.

Inter-Method Reliability of Pulse Volume Related Measures Derived Using Finger-Photoplethysmography

2018 ◽  
Vol 32 (4) ◽  
pp. 182-190 ◽  
Author(s):  
Kenta Matsumura ◽  
Koichi Shimizu ◽  
Peter Rolfe ◽  
Masanori Kakimoto ◽  
Takehiro Yamakoshi
Keyword(s):  
Light Intensity ◽  
Adverse Effects ◽  
Light Source ◽  
Direct Current ◽  
Resting State ◽  
Current Component ◽  
Psychophysiological Measures ◽  
Pulse Volume ◽  
Optical Paths ◽  
Sensor Positions

Abstract. Pulse volume (PV) and its related measures, such as modified normalized pulse volume (mNPV), direct-current component (DC), and pulse rate (PR), derived from the finger-photoplethysmogram (FPPG), are useful psychophysiological measures. Although considerable uncertainties exist in finger-photoplethysmography, little is known about the extent of the adverse effects on the measures. In this study, we therefore examined the inter-method reliability of each index across sensor positions and light intensities, which are major disturbance factors of FPPG. From the tips of the index fingers of 12 participants in a resting state, three simultaneous FPPGs having overlapping optical paths were recorded, with their light intensity being changed in three steps. The analysis revealed that the minimum values of three coefficients of Cronbach’s α for ln PV, ln mNPV, ln DC, and PR across positions were .948, .850, .922, and 1.000, respectively, and that those across intensities were .774, .985, .485, and .998, respectively. These findings suggest that ln mNPV and PR can be used for psychophysiological studies irrespective of minor differences in sensor attachment positions and light source intensity, whereas and ln DC can also be used for such studies but under the condition of light intensity being fixed.

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