INCREASING THE ENERGY EFFICIENCY OF THE AC ELECTRIC LOKOMOTIVE TRACTION DRIVE

The study of the energy characteristics of the active traction converter with pulse-width modulation as part of the traction electric drive of an AC electric locomotive was held during the research. Active traction converter provides pulse-width control of the collector DC traction motors voltage and belongs to the basic AC / DC circuit. The transient process when switching transistor switches is accompanied by significant voltage surge, due to the scattering inductance reaction of the traction transformer. Studies have shown that the diode discharge buffer circuits do not provide discharge of the electromagnetic energy accumulated in the winding of the transformer. An active traction converter control algorithm has been developed, which implies the use of pulse-width and phase regulation of rectified voltage. Switching of transistor switches occurs in the presence of a parallel current circuit. This creates the conditions for the discharge of electromagnetic energy accumulated in the secondary winding circuit of the traction transformer. The developed mathematical model allows to investigate the electromagnetic processes that occur during the switching of transistor switches and to evaluate the energy efficiency of the electric locomotive with active traction converter. In the simulation process, the influence of active traction converter parameters and control algorithms on the power rate of the converter, the total THD distortion rate of current and voltage and the relative values of the rectified voltage were investigated. Measures to increase the power rate and to reduce the emission level of higher current harmonics into the traction network were proposed.

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A 6.8 TOPS/W Energy Efficiency, 1.5µW Power Consumption, Pulse Width Modulation Neuromorphic Circuits for Near-Data Computing with SSD

2018 IEEE Asian Solid-State Circuits Conference (A-SSCC) ◽

10.1109/asscc.2018.8579333 ◽

2018 ◽

Author(s):

Kota Tsurumi ◽

Kenta Suzuki ◽

Ken Takeuchi

Keyword(s):

Energy Efficiency ◽

Power Consumption ◽

Pulse Width ◽

Pulse Width Modulation ◽

Neuromorphic Circuits

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DIGITAL AND PULSE-WIDTH CONTROL OF A SPACE ROBOT WHEN APPROACHING A GEOSTATIONARY SATELLITE

Izvestiya of Samara Scientific Center of the Russian Academy of Sciences ◽

10.37313/1990-5378-2020-22-5-74-78 ◽

2020 ◽

Vol 22 (5) ◽

pp. 74-78

Author(s):

Ye.I. Somov ◽

◽

S.A. Butyrin ◽

S.Ye. Somov ◽

◽

...

Keyword(s):

Pulse Width ◽

Electric Propulsion ◽

Pulse Width Modulation ◽

Geostationary Satellite ◽

Space Robot ◽

Control Algorithms ◽

Control Problems ◽

Guidance And Control ◽

Gyroscopic Moment ◽

And Control

The control problems on a space robot during its approach to an information geostationary satellite are considered. The robot motion control system uses an electric propulsion system with 8 engines at the pulse-width modulation of their thrust values and a gyroscopic moment cluster based on 4 gyrodines with digital control. Numerical results are presented that demonstrate the effectiveness of the developed discrete guidance and control algorithms.

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Study of Excitation Characteristics of Traction Machine/Drive Systems

Energies ◽

10.3390/en13010151 ◽

2019 ◽

Vol 13 (1) ◽

pp. 151

Author(s):

Wenying Jiang ◽

Qiqi Guo ◽

Zhen Zhang

Keyword(s):

Pulse Width ◽

Pulse Width Modulation ◽

Current Source ◽

Computation Time ◽

Voltage Source ◽

Permanent Magnet Synchronous Machines ◽

Current Harmonics ◽

Influence Model ◽

Machine Drive ◽

Drive Systems

In order to accurately evaluate the performance of a traction machine/drive system, it is necessary to have an accurate excitation source which considers current harmonics. In this paper, four machine/drive systems with different excitation sources have been modeled, simulated, and studied to evaluate the effects on permanent magnet synchronous machines (PMSMs) from different perspectives. In Model I, the excitation is an ideal sinusoidal current source with no harmonics. Model II is excited by an ideal sinusoidal voltage source regardless of the pulse width modification’s (PWM’s) influence. Model III takes into account the influence of current harmonics under space vector pulse width modulation (SVPWM) control. Model IV is based on the equivalent circuit extraction (ECE) model (a look-up table motor model). We simulate these four models and study the characteristics of the excitation sources, based on the observations of current harmonics, torque, electromagnetic force, computation time, and efficiency. Experiments are also conducted to show that Model III allows the most precise study of the considered system. Model IV is a good substitution, providing similar results with a shorter running time.

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Pulse width modulation AC/DC converters with line current harmonics minimisation and high power factor using hybrid particle swarm optimisation

IET Power Electronics ◽

10.1049/iet-pel.2008.0045 ◽

2009 ◽

Vol 2 (6) ◽

pp. 686-696 ◽

Cited By ~ 18

Author(s):

H. Lou ◽

D. Wang ◽

J. Lu ◽

C. Mao ◽

W.-J. Lee

Keyword(s):

Power Factor ◽

High Power ◽

Pulse Width ◽

Pulse Width Modulation ◽

Particle Swarm ◽

Particle Swarm Optimisation ◽

Current Harmonics ◽

Hybrid Particle ◽

Line Current ◽

High Power Factor

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Advanced Fan Controller Using Atmega 1284P

The Scientific Bulletin of Electrical Engineering Faculty ◽

10.1515/sbeef-2017-0033 ◽

2018 ◽

Vol 18 (2) ◽

pp. 43-47

Author(s):

F.G. Apostol ◽

G. Predusca

Keyword(s):

Pulse Width ◽

Pulse Width Modulation ◽

Source Code ◽

Manual Control ◽

The Internet ◽

Operating Parameters ◽

Monitoring And Control ◽

Mode Of Operation ◽

Maximum Temperatures ◽

And Control

AbstractThe project aims at creating a monitoring and control circuit in a desktop or complex system with the possibility to set the operating parameters. The project allows automatic and manual control of a certain number of fans using Pulse Width Modulation (PWM) control by the user or automatically by the system monitoring thresholds of minimum and average temperatures (also set by the user within the code). The system was designed with the following options: audible and visual alert when reaching maximum temperatures; time display, PWM percentage and three temperatures shown on a 16x2 LCD; the system-acquired data is then transmitted to a website. Additional features include the possibility of setting a color inside the system, also used as an alert as well as a color adjustment function by sound (for a musical lightshow). The mode of operation is based on the source code written in the Arduino IDE 1.6.3 software with the help of free libraries and free codes provided on the internet.

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Independent PRF Generation and Control for Frequency Phase Calibration on Mono-pulse Radar at a Remote Location

Journal of the Korea Institute of Military Science and Technology ◽

10.9766/kimst.2021.24.4.368 ◽

2021 ◽

Vol 24 (4) ◽

pp. 368-373

Author(s):

Jaewon Yang ◽

Seungoh Yoo ◽

Jaehyuk Yoon ◽

Dongju Lee

Keyword(s):

Pulse Width ◽

Pulse Width Modulation ◽

Pulse Repetition Frequency ◽

Average Frequency ◽

Precision Control ◽

Remote Location ◽

Pulse Radar ◽

Phase Calibration ◽

And Control ◽

Frequency Phase

This paper presents a method of independent pulse repetition frequency(PRF) generation and control for frequency phase calibration on mono-pulse radar at a remote location. In order to generate an independent PRF signal of 320[Hz], pulse width modulation(PWM) of 16-bit timer/counter was applied. For a precision control of PRF signal, 16-bit timer/counter interrupt was changed for each period. Therefore, average frequency of PRF could be controlled by 0.0001[Hz]. To calibrate a frequency phase of mono-pulse radar at a remote location, the proposed PRF generator with a precision control of frequency was used regardless of receiving PRF signal from a radar. For the verification of the proposed PRF generator, theoretical analysis and experimental results are included.

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