scholarly journals DEVELOPMENT OF AN AUTOMATIC REFLUX RATIO REGULATION SYSTEM FOR THE RECTIFICATION COLUMN

2020 ◽  
Vol 20 (4) ◽  
pp. 104-114
Author(s):  
L.G. Tugashova ◽  
◽  
A.V. Zatonskiy ◽  
Keyword(s):  
Low Power ◽  
Diesel Fuel ◽  
Linear Part ◽  
Flux Ratio ◽  
Automatic Regulation ◽  
Regulation System ◽  
Reflux Ratio ◽  
Matlab Simulink ◽  
Atmospheric Column ◽  
Electric Dehydrator

This article provides an overview of the methods of managing the primary petroleum refining. To improve separation efficiency was proposed to stabilize the reflux ratio in the rectifying column. Purpose of work. To develop a system for automatic regulation of the reflux ratio of diesel fuel sec-tions in an atmospheric column of the refinery oil. To study the operating modes of an atmospheric column with the participation of the obtained automatic control system. Materials and methods. The article presented the features of the oil rectification process at the atmospheric unit of a small capacity refinery. The features of heat dissipation with intermediate circulation flash compared to a large-capacity unit will be shown in this article. The parameters of the facility were selected and divided into groups. A dynamic model of the section of shell-and-tube heat exchangers for heating oil with diesel fuel at a low-power refinery unit in the form of differential equations of heat balance has been developed to achieve the goal set work. An electrode dehydrator material balance equation has been compiled to find desalted oil consumption and saltwater consumption. The dependence of the reflux ratio of diesel fuel sections of the atmospheric column on the inlet and outlet temperatures of the atmospheric column circulation flash, the acute fractionation con-sumption, circulation flash, and oil fraction selection was obtained. The resulting model of the facili-ty consists of two parts: the linear part of the electric dehydrator and heat exchanger section, which determines the temperatures of the coolants, and the nonlinear output part, which determines the re-flux ratio depending on technological parameters. The proposed model makes it possible to investi-gate the effect of disturbances on the controlled parameters. The MATLAB/Simulink software prod-uct has been chosen as a tool to implement the model. A system of automatic regulation of the re-flux ratio in MATLAB/Simulink has been built with the participation of the developed model of the study object. Conclusion. The results of modeling a system for automatic regulation of the reflux ratio of diesel fuel sections in the atmospheric column of a low-power refinery unit has been ob-tained, taking into account the peculiarities of the process under disturbance conditions.

scholarly journals Estimation of Semiconductor Switching Losses under Hard Switching using Matlab/Simulink Subsystem

2013 ◽  
Vol 2 (1) ◽  
pp. 20-26 ◽  
Author(s):  
Volodymyr Ivakhno ◽  
Volodymyr V. Zamaruiev ◽  
Olga Ilina
Keyword(s):  
Semiconductor Devices ◽  
Average Power ◽  
Power Converter ◽  
System Level ◽  
Automatic Regulation ◽  
Regulation System ◽  
Matlab Simulink ◽  
Turn On ◽  
System Level Simulation ◽  
Power Switch

AbstractThe conventional tools for the system level simulation of the switch-mode power converters (for example, MATLAB/SIMILINK) allow simulating the behavior of a power converter jointly operating with the control system in a closed automatic regulation system. This simulation tools either represent semiconductor devices as ideal switches or implement the simplest models based on volt-ampere characteristics of standard types of semiconductor devices for conducting loss estimation. This fact makes direct calculation of dynamic power losses in the semiconductor devices impossible. The MATLAB/SIMILINK subsystem that calculates the average power dissipated in the power switch during turn-on and turn-off transition is proposed in this paper. The represented approach used in the subsystem estimates by the means of MATLAB/SIMILINK the values of turn-on and turn-off energies at power switch commutation instances on the base of switching current and voltage measurements and the values of commutation energies given in datasheet on power switch. The simulation results of step-down converter with IGBT and proposed subsystem in MATLAB/SIMULINK were compared with the calculation results obtained in Semisel

UNIVERSAL DIGITAL CONTROL SYSTEM OF A MACHINE AND TRACTOR AGGREGATES

1970 ◽  
pp. 10-14
Author(s):  
А. Yu. Izmaylov ◽  
Ya. P. Lobachevskiy ◽  
V. К. Khoroshenkov ◽  
N. Т. Goncharov ◽  
S. E. Lonin ◽  
...  
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Digital Control ◽  
Crop Protection ◽  
Automatic Regulation ◽  
Regulation System ◽  
Information Control ◽  
Operational Parameters ◽  
Technological Processes ◽  
Control And Management

The introduction of information and digital technologies that support and support all technological processes in the field is an urgent need for the development and implementation of such technology. An organisationally complex and financially intensive project is necessary because of the wide variety of economic entities that differ in the size of production, forms of ownership and socio-economic conditions of production. Automated information control system for mobile units agricultural enterprise provides those-Niko-economic performance, optimum capacity utilization through the use of timely and reliable information on technology. Machine and tractor aggregates are appertained as control objects with variable structure, which is explained by possibility of the system formation from tractor or field machines mobile units with various purposes: tillable, cultivatable, sowing, harvesting and etc. This MTA feature was determined creation of digital control systems of two groups of automatic control and management of the basic energy and operational parameters: tractors, machines and vehicles as part of MTA. To the first group are appertained the automatic control system of tractor motor component loading, motion speed, frictional sliding. To the second group – automatic regulation system of operating depth, seed rate, treatment of liquid combined fertilizers and crop protection agents, filling and driving of various MTA. Novelty of researches consists in methodology of the organization of the centralized control and management of various technological processes at carrying out field works.

The Prototype Implementation of Interleaved Based PFC Rectification Light Emitting Diodes Systems for Low Power Applications

2020 ◽  
Vol 12 (4) ◽  
pp. 499-505
Author(s):  
J. Stanly Jones ◽  
S. Sutha ◽  
R. Saravanan
Keyword(s):  
Low Power ◽  
Power Factor ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Power Factor Correction ◽  
Low Cost ◽  
Prototype Implementation ◽  
Matlab Simulink ◽  
Light Emitting ◽  
Switching Controller

This proposed topology presents the interleaved boost AC–DC rectification for power factor correction. This topology operating at CCM. It has low semiconductor components, low cost, less complexity and it has low ripple voltage. It's PF reach to high at AC side and also has high efficiency and reduced harmonics. This AC–DC rectifier controlled with a PID switching controller which is used to a utilized laptop and mobile charging applications. This topology verified by Matlab Simulink and bridgeless topology LED electronics prototype kit has tested and verified.

scholarly journals Design of Multivariable Control System of a Distillation Tower via Simulation Using MATLAB/Simulink

2019 ◽  
Vol 26 (3) ◽  
pp. 51-61
Author(s):  
Duraid F. Ahmed ◽  
Mohanad Y. Nawaf
Keyword(s):  
Control System ◽  
Flow Rate ◽  
Absolute Error ◽  
Multivariable Control ◽  
Reflux Ratio ◽  
Distillation Tower ◽  
Matlab Simulink ◽  
Set Point ◽  
Condenser Temperature ◽  
Fast Access

This paper deals with the multivariable control system of the distillation tower by applying multi-structures in MATLAB/Simulink for a binary mixture of benzene and toluene. Four structures configurations of the distillation are applied based on the level and temperature variables. The PID controller is used in all structures in multivariable. These structures are compared with different disturbances. The integral absolute error is a criterion to test the controller\\\’s performance under step change disturbances. The controller\\\’s performance was investigated by recording responses to disturbances in set-point of reflux ratio, flow-rate of top and bottom products. The step testing appears to be the single-ended temperature control with bottom and top-level structures to regulate the flow rate of the bottom and top products. The best structure is top-level, bottom level and condenser temperature because the column made more stable, the integral absolute error is minimum value and fast access to set-point value.

Matlab Simulink Simulation of Respiratory Effort Energy Harvester Using Electromagnetic Generator

2015 ◽  
Vol 793 ◽  
pp. 417-421
Author(s):  
Azuwa Ali ◽  
Noor Ashikin Mohd Razali ◽  
Mahmoud Albreem ◽  
Mohd Hafiz Arshad ◽  
Khairuddin Khalid
Keyword(s):  
Energy Source ◽  
Low Power ◽  
Chest Wall ◽  
Energy Harvester ◽  
Human Motion ◽  
Respiratory Effort ◽  
Power Devices ◽  
Matlab Simulink ◽  
Simulink Simulation ◽  
Electromagnetic Generator

Electromagnetic generator as respiratory effort energy harvester is designed as a renewable energy source to generate a low power and exploiting human motion to extract energy. By selecting respiratory effort as energy harvester it can be carried out 24 hours as long as the electromagnetic generator is wearing on the human chest. It is because the electromagnetic generator functions when there is a motion of the chest wall. The electromagnetic generator basically constructed with two miniature dc motor generator, pulley, belt, gear and chest belt. The generator operates when there is change in chest wall circumstance during exhalation breathing process. The low power that produces can be apply on low power devices such as sensor or microcontroller. Simulation is done using Matlab Simulink to verify that respiratory effort able to produce the minimum required power to power up low power devices. Result from the simulation showing good outcome with 2.5mW of output power.

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