A power-supply control system for the NESTOR X-ray generator

2014 ◽  
Vol 11 (5) ◽  
pp. 599-602
Author(s):  
I. M. Karnaukhov ◽  
D. E. Korzhov ◽  
V. N. Lyaschenko ◽  
A. O. Mytsykov ◽  
V. I. Trotsenko
Keyword(s):  
Control System ◽  
Power Supply ◽  
X Ray

Control System of Power Supply in Under-Ground Coal Mining

2006 ◽  
Vol 2 (3) ◽  
pp. 12-19
Author(s):  
G. G. Pivnyak ◽  
Keyword(s):  
Control System ◽  
Coal Mining ◽  
Power Supply

The thermal control system of the x-ray telescope eROSITA on Spektrum-Roentgen-Gamma

2012 ◽  
Author(s):  
Maria Fürmetz ◽  
Josef Eder ◽  
Elmar Pfeffermann ◽  
Peter Predehl ◽  
Lars Tiedemann
Keyword(s):  
Control System ◽  
Thermal Control ◽  
X Ray ◽  
Thermal Control System

EXPERIMENTAL STUDIES ON THE DEVELOPMENT OF AN AUTOMATED SYSTEM FOR REGULATING THE SOIL DENSITY USED IN A SEEDING MACHINE

2021 ◽  
pp. 9-15
Author(s):  
ALEKSEI S. DOROKHOV ◽  
Keyword(s):  
Control System ◽  
Automatic Control ◽  
Automatic Control System ◽  
Power Supply ◽  
Experimental Studies ◽  
Automated System ◽  
Statistical Characteristics ◽  
Vegetable Crops ◽  
Soil Density ◽  
Density Control

Research on the development of an automatic control system for the rolling-in working units is aimed at establishing the reliability and analytical relationships, determining the quality indicators of work in real conditions of the rolling-in working units of a seeding machine, and checking the patterns obtained in the fi eld and identifi ed theoretically. Research on the development of an automatic control system for the rolling implements was carried out when sowing dragee seeds of table beet of the Bordeaux variety with a seeding unit consisting of a Belarus-4235 tractor and a Monopil S15/12 precision seeding machine. The system for automatic control of soil density includes the main hardware and software: actuators for maintaining and deepening the rolling working units, microcontrollers, motor drivers, a non-contact ultrasonic sensor, a power supply unit and a sensor for measuring soil density. The paper presents the results of a study to determine the soil density when sowing seeds of table beet, depending on the moisture content of the soil in the sowing layer. The authors describe research methodology, provide graphical relationships between changes in soil density and the depth of seeding, and comment on the main obtained statistical characteristics of the experiment. As a result of the study, structural, echnological and functional diagrams of a rolling rink with an automatic control system using electronically controlled electric cylinders (linear actuators) have been developed. The optimal parameters of the linear drive of the press roller have been established: power - 50W, power supply - 12V, rod stroke - 200…600 mm, speed - 10…45 mm/s, load - 200…900 N. Experimental studies have shown the applicability of the presented system of the automatic control of soil density, which ensures the optimum density of the seedbed of 1.3…1.4 g/cm³. The described technique can be used to develop a soil density control system when sowing seeds of other vegetable crops.

Internet of Things Based Auxiliary Control System for Smart Substation

2012 ◽  
Vol 614-615 ◽  
pp. 1790-1795 ◽  
Author(s):  
Jia Hui Wang ◽  
Xiang Zhen Li ◽  
Rui Ting Lu ◽  
Feng Jie Sun
Keyword(s):  
Control System ◽  
Internet Of Things ◽  
Power Supply ◽  
Communication Protocol ◽  
Present Situation ◽  
Video Monitoring ◽  
Auxiliary System ◽  
Remote Transmission ◽  
System Optimal ◽  
Smart Substation

In order to solve the present situation that auxiliary facilities in substation separate from each other and unable to achieve intelligent interactive features, this paper presents the smart substation auxiliary control system based on the IoT (Internet of Things). The system monitors and controls the production auxiliary system of substation, and in the background using IEC61850 communication protocol to achieve the auxiliary production system internal and mutual coordination linkage and information remote transmission. The system integrates all the substation auxiliary facilities, including video monitoring subsystem, security subsystem, lighting subsystem, power supply subsystem and auxiliary system optimal control subsystem, providing smart substation of informatization, automation and interaction auxiliary support.

scholarly journals Improving of operation stability of frequency converters with active rectifiers in electric steel-making complex electrical equipment switching

Vestnik IGEU ◽  
2019 ◽  
pp. 48-58
Author(s):  
A.A. Nikolaev ◽  
A.S. Denisevich ◽  
V.S. Ivekeev
Keyword(s):  
Control System ◽  
Power Supply ◽  
Electric Arc ◽  
Voltage Sags ◽  
Parallel Operation ◽  
Frequency Converters ◽  
Active Rectifier ◽  
Arc Furnaces ◽  
Operation Stability ◽  
Active Rectifiers

Frequency converters with active rectifiers (FC-AR) are now used in rolling mill electric drives. Modern control systems of ARs are not adapted to voltage sags in power supply systems, which leads to converter tripping. The known methods of ensuring AR operation stability, such as kinetic buffering, correction signals based on negative sequence voltage and others, do not eliminate these emergency trips. As an additional measure the paper proposes the method of voltage sag compensation by using static var compensators (SVC) of electric arc furnaces (EAF) for parallel operation of frequency converters with active rectifiers and electric arc furnaces. However, it remains unknown how disturbances (such as overvoltages of switching of SVC harmonic filters (HF) and voltage sags during furnace transformer switching) affect operation stability of frequency converters with active rectifiers. All this makes it necessary to study the effect of these processes on the operation conditions of FC-AR and to improve the active rectifier control system. The authors used experimental arrays of instantaneous values of voltages and currents of the real-life complex «EAF-SVC» («Electric Arc Furnace – Statistic VAR Compensator») in this study. They also applied mathematical models of FC-AR with different PWM algorithms realized in Matlab-Simulink software. The main assumption of the model consists in using equivalent current sources modelling the operation of autonomous voltage invertors. An improved control system of AR has been developed. The main feature that distinguishes it from the known systems is the fact that it ensures operation stability during SVC harmonic filter and EAF transformer switching by using a signal conditioning unit for setting the active rectifier reactive current component as a function of power supply and AR input voltage difference. Implementation of the improved AR control system improves FC-AR stability during parallel operation with EAFs through reactive power consumption of the supply system. As a result, it reduces the amplitude of inrush current and voltage deviations in the DC-link of the FC-AR to the values lower than the setpoints of the AR protection system.

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