scholarly journals THE INFLUENCE OF THE INPUT INDUCTANCE ON THE QUALITATIVE INDICATORS OF ACTIVE CONTROLLED RECTIFIER

2021 ◽  
pp. 18-23
Author(s):  
Denis Krylov ◽  
Olga Kholod
Keyword(s):  
Control System ◽  
Electromagnetic Compatibility ◽  
Modulation Frequency ◽  
Frequency Converter ◽  
Voltage Source ◽  
Stable Operation ◽  
Active Rectifier ◽  
Semiconductor Converters ◽  
Three Phase

The main part of electricity is used by industrial plants in a converted form and the use of semiconductor converters is growing rapidly. The requirements for the quality of semiconductor converters are increased. And their impact on the power supply, load and related consumers is increased too. One of the most popular converters in the segment of low and medium power drives is a frequency converter made on the basis of a three-phase stand-alone voltage inverter. A significant disadvantage of such converters is the use of a diode rectifier at the input of the circuit, which has disadvantages as the inability to recover electricity to the mains in the mode of dynamic braking of an induction motor and significant distortions of the mains current. These disadvantages can be eliminated by using an active rectifier instead of a diode rectifier, which provides a sinusoidal shape of the mains current in phase with the mains voltage and the possibility of bidirectional energy exchange with the load. The efficiency of the active rectifier-voltage source is determined by the selected control algorithm of the circuit switches and the correct task of the inductance of the input choke. A mathematical model of a three-phase active rectifier-voltage source, working with a fixed modulation frequency with a vector algorithm for building a control system and analysis of the influence of the input inductance on the quality of its work was created. From the simulation results it became obvious that the proposed structure of the control system provides stable operation of the converter and acceptable standards for electromagnetic compatibility with the mains at a fixed modulation frequency; the proposed algorithm for calculating the value of the input inductances allows you to correctly select their allowable value, and obtained in the simulation of the dependence allows you to most accurately determine the value of the input inductances on the allowable level of distortion of mains current and supply voltage.

scholarly journals Improving of the vector control system structure of the active controlled rectifier

2021 ◽  
pp. 43-48
Author(s):  
Denis Krylov ◽  
Olga Kholod
Keyword(s):  
Control System ◽  
Vector Control ◽  
Power Supply ◽  
Frequency Converter ◽  
System Structure ◽  
Voltage Source ◽  
Active Rectifier ◽  
Semiconductor Converters ◽  
Vector Control System

The vast majority of electricity is used by industrial facilities in a converted form. At the same time, the use of semiconductor converters to obtain the required load parameters is intensively increasing. Current trends in the development and improvement of semiconductor converters are aimed at energy saving by improving their quality of work and reducing the impact on the power supply, load, and related consumers. Frequency converter with DC insert has become widespread and widely used. Its scheme is mainly based on an uncontrolled diode rectifier and an autonomous voltage inverter. Uncontrolled rectifiers are simple and reliable, but have two main disadvantages: the impossibility to recover electricity to the supply network and distortions of the source current shape. We can get rid of these disadvantages by using an active rectifier made according to the voltage source scheme instead of an uncontrolled rectifier. The operation of an active rectifier significantly depends on the type of its control system structure. This article aims to to improve the structure of the switches control system of the active rectifier scheme – voltage source built using a vector calculation algorithm; creation of a MatLab model of a three-phase active-controlled rectifier operating with a fixed modulation frequency and analysis of the influence of the input inductance value on the quality of its operation. The simulation results confirm that the improved structure of the vector control system proposed by the authors ensures high-quality operation of the active rectifier and electromagnetic compatibility of the frequency converter with the power supply network at the level allowed by the standards; simplification of the representation mathematical apparatus of the generalized vectors of currents and voltages at the construction of a vector control system of the active rectifier – voltage source practically did not influence qualitative indicators of the converter work in any way; a network filter must be used to eliminate the final distortions introduced into the source voltage by an additional nonlinear load.

Study of the Influence of Control System Parameters on the Quality of the Input Current of a Three-Phase Power Factor Corrector

2021 ◽  
Vol 2 (2) ◽  
pp. 29-35
Author(s):  
Dmitry A. Sorokin ◽  
◽  
Sergey I. Volskiy ◽  
Jaroslav Dragoun ◽  
◽  
...  
Keyword(s):  
Control System ◽  
Power Factor ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Input Current ◽  
System Operation ◽  
Error Amplifier ◽  
Three Phase ◽  
Power Factor Corrector

The paper suggests a control system of a three-phase power factor corrector. The study of the control system operation is carried out and the expressions for calculating the permissible values of error amplifier factors are obtained. The influence of the error amplifier parameters on phase current quality is investigated. The dependence of total harmonic distortion input current on a combination of error amplifier parameters is obtained at a given value of power factor. The conditions under which the total harmonic distortion input current has the minimum value are found out. This article is of interest to power electronics engineers, who are aimed at developing a three-phase power factor corrector.

REPETITIVE-CONTROL SYSTEM FOR HARMONIC ELIMINATION IN THREE-PHASE VOLTAGE-SOURCE INVERTERS

2005 ◽  
Vol 38 (1) ◽  
pp. 430-435 ◽  
Author(s):  
Pedro Luis Roncero-Sánchez ◽  
Vicente Feliu-Batlle ◽  
Aurelio García-Cerrada ◽  
Pablo García-González
Keyword(s):  
Control System ◽  
Repetitive Control ◽  
Voltage Source ◽  
Phase Voltage ◽  
Voltage Source Inverters ◽  
Harmonic Elimination ◽  
Three Phase

Harmonics control of three phase voltage source inverter with random carriers and modified reference

2021 ◽  
pp. 002072092199659
Author(s):  
R Anand ◽  
L Padmasuresh ◽  
P Muthukumar ◽  
P Sreeja ◽  
V Krishnakumar ◽  
...  
Keyword(s):  
Motor Drives ◽  
Voltage Source ◽  
Spectral Quality ◽  
Phase Voltage ◽  
Voltage Source Inverter ◽  
Middle Portion ◽  
Induction Motor Drives ◽  
Three Phase ◽  
Experimental Values

The Harmonics control of any inverters can be decided by the PWM incorporated for the switches. In recent years the carrier and reference modification based research is going on the inverter field. This paper suggests that the alteration of carriers and references of the three phase voltage source inverter enhance the ability to decrease the harmonic content.This enhanced realization deals with the carrier and reference modification arrangement for three phase voltage source inverter through amalgamating the boosted reference and random triangular carrier. The boosted reference is the addition of sine reference with injection of 1/3rd of reference amplitude (3fs) in the middle portion of the reference wave. i.e., [Formula: see text] to [Formula: see text] and [Formula: see text] to [Formula: see text] . The proposed PWM scheme use two carriers, one is Triangle wave and another one is inverted Triangle wave. The process of selecting the winning carrier among the two triangle carriers is purely based on the LFSR technique. The spectral quality of the induction motor drives has improved by the random carriers. The simulation and experimental values are proving the validity of the PWM method. The PWMs are generated by using parallel processing enabled FPGA processor.

scholarly journals Comparative study of frequency converters of three-phase electric motors in automatic control of technological parameter

2021 ◽  
Vol 2 (3) ◽  
pp. 48-56
Author(s):  
Margarita M. Blagoveshchenskaya ◽  
Mikhail V. Veselov
Keyword(s):  
Pid Controller ◽  
Technological Parameter ◽  
Test Bench ◽  
Frequency Converter ◽  
Electric Motors ◽  
Technological Parameters ◽  
Frequency Converters ◽  
Ac Motors ◽  
Three Phase

Frequency converters of asynchronous three-phase AC motors are widely used in industry, including food production. A thorough understanding of the technical capabilities of frequency converters contributes to their efficient use. This article discusses a technical comparison of two frequency converters of three-phase electric motors of the Russian company "OWEN" and the Danish company "DANFOSS" according to the criterion of the quality of regulation of the technological parameter. For comparison, a test bench was created, in which the devices were tested in turn, under the same conditions. During the preparation and implementation of testing, it turned out that the hardware capabilities of frequency converters for their use in regulating technological parameters are the same, and the parametric capabilities are different. The frequency converter of the "OWEN" company is equipped with a PI controller, and the frequency converter from "DANFOSS" is equipped with a PID controller. As the results of testing the devices show, despite 

Improved Model of an Intermediate Point Enthalpy Control System for Enhancing Boiler Efficiency

2018 ◽  
Vol 141 (2) ◽  
Author(s):  
Zihao Yang ◽  
Yanping Zhang ◽  
Wei Gao
Keyword(s):  
Control System ◽  
Control Method ◽  
Control Object ◽  
Stable Operation ◽  
Feed Water ◽  
Intermediate Point ◽  
Control Quality ◽  
Boiler Efficiency ◽  
Improved Model

Control quality of an once-through boiler’s water-fuel ratio (WFR) and main-steam temperature are heavily influenced by the control quality of the once-through boiler’s intermediate point enthalpy (IPE), and it is also related to the economic and stable operation of the a once-through boiler. In order to control the IPE in a better way and to increase boiler efficiency, an improved model of IPE control system was built in this paper, matlab/simulink is used to build the IPE control system model based on a 600 MW supercritical unit, and the mechanism model of the control object is built in the same time. The feedforward of the feed-water temperature is brought to this model to increase the control rate. The control method of amendments to the amount of coal and the control method of amendments to the amount of feed-water are combined by the means of fuzzy control to solve the problem of the contradiction of the responding speed of the IPE and the separation interface’s stability of the steam-water separator. The simulation results show that the improved control method has better control effect and higher boiler efficiency was obtained as well.

scholarly journals The Study Methods of Increase Efficiency Algorithms Pulse width Modulation in AC Electric Drives

2016 ◽  
Vol 6 (6) ◽  
pp. 2855
Author(s):  
Bogdan Y. Vasilev
Keyword(s):  
Electric Drive ◽  
Pulse Width ◽  
Electromagnetic Compatibility ◽  
Pulse Width Modulation ◽  
Frequency Converter ◽  
Control Algorithms ◽  
Electric Drives ◽  
Ac Electric Drive ◽  
Semiconductor Converter ◽  
Three Phase

<p>In the paper describes the AC electric drive, which consists of the induction motor and the semiconductor converter. Structure of the frequency converter, which includes a three-phase bridge inverter on based fully controlled transistors, is considered. The algorithm of pulse width modulation, which used in the majority of the electric drives, is discussed. The characteristics and shortcomings of the algorithm is shows. Algorithmically methods to improve the efficiency of the inverter – promodulation control signal. The efficiency of this method in different variations is given. The level electromagnetic compatibility inverter and efficiency various control algorithms are analyzed. The conclusions about feasibility of using the method promodulation.</p>

Application of SENLAN SB60 in Flow Variable Frequency Speed Control System

2013 ◽  
Vol 860-863 ◽  
pp. 2320-2323
Author(s):  
Jiao Yue Liu ◽  
Ju Qing Yang ◽  
Lin Ma
Keyword(s):  
Control System ◽  
Flow Control ◽  
Frequency Converter ◽  
Asynchronous Motor ◽  
Speed Control ◽  
Output Frequency ◽  
Speed Regulation ◽  
Three Phase ◽  
Speed Control System ◽  
Voltage Signal

The frequency speed control system in flow control based on SENLAN SB60 frequency converter is made up of input set value and actual value which is the feedback voltage signal given by flow sensor, then adjusted by process PID automatic control, changes output frequency to regulate the speed of three-phase asynchronous motor to achieve the purpose of speed regulation, thus the tank's flow control can be obtained.

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