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.

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.

A vector control system using a neutral-point-clamped voltage-source pwm inverter

1993 ◽  
Vol 113 (5) ◽  
pp. 93-101
Author(s):  
Satoshi Ogasawara ◽  
Tadashi Sawada ◽  
Keiichi Abe ◽  
Hirofumi Akagi
Keyword(s):  
Control System ◽  
Vector Control ◽  
Neutral Point ◽  
Voltage Source ◽  
Pwm Inverter ◽  
Vector Control System

scholarly journals A Vector Control System Using a Neutral-Point-Clamped Voltage Source PWM Inverter.

1991 ◽  
Vol 111 (11) ◽  
pp. 930-936 ◽  
Author(s):  
Satoshi Ogasawara ◽  
Tadashi Sawada ◽  
Keiichi Abe ◽  
Hirofumi Akagi
Keyword(s):  
Control System ◽  
Vector Control ◽  
Neutral Point ◽  
Voltage Source ◽  
Pwm Inverter ◽  
Vector Control System

scholarly journals Vector control system of electric drive of grain machine conveyor

2021 ◽  
pp. 8-16
Author(s):  
Evgeniia Burdilna ◽  
Sergii Serhiienko ◽  
Oleksiy Chornyi
Keyword(s):  
Control System ◽  
Vector Control ◽  
Quality Indicators ◽  
Electric Drive ◽  
Frequency Converter ◽  
Regulation System ◽  
Speed Reduction ◽  
Idle Speed ◽  
Asynchronous Electric Drive ◽  
Vector Control System

Purpose. Synthesis of an automatic control system for an asynchronous electric drive of a grain thrower conveyor based on a frequency converter with vector control. Methodology. The research was carried out using methods of mathematical modeling of an electric drive; using methods of tuning optimization and regulator synthesis. The technique of synthesis of vector control systems is based on the representation of a non-stationary multi-connected object, which is an AC machine, in the form of a set of stationary subobjects with linear links in the main control channels. Findings. The study of the work of the subordinate regulation system, which implements the principles of vector control, oriented along the vector of the rotor flux linkage, has been carried out. The modeling of the processes of AM excitation, AM start-up at idle speed, nominal load surge, speed reduction has been carried out. It was found that the synthesized system is characterized by good quality indicators. The overshoot at start does not exceed 5%, the regulation time is 0.4 s, the torque limitation is carried out at a predetermined level. It has been proven that oscillatory processes in transient modes with significant torque surges with classical settings of loop regulators can be compensated by introducing artificial cross-links into the control part of the electric drive. Originality. A system of subordinate regulation of the blood pressure of the grain thrower trimmer conveyor has been implemented to set the speed of the grain flow with the aim of throwing grain at a given distance by creating an appropriate ballistic flight trajectory, which ensures a reduction in losses from damage to grain. Practical value. The structure of the vector control system of a frequency-controlled asynchronous electric drive with additional compensating cross-connections between active and reactive energy control channels is proposed to improve the quality indicators of the system.

H? Observer Based Sensor-less Control Strategy for Interior Permanent Magnet Synchronous Motor

2011 ◽  
Vol 12 (3) ◽  
Author(s):  
Naomitsu Urasaki ◽  
Abdul Motin Howlader ◽  
Atsushi Yona ◽  
Tomonobu Senjyu ◽  
Ahmed Y. Saber
Keyword(s):  
Control System ◽  
Vector Control ◽  
Permanent Magnet ◽  
High Speed ◽  
Permanent Magnet Synchronous Motor ◽  
Estimation Accuracy ◽  
Voltage Source ◽  
Permanent Magnet Synchronous Motors ◽  
Flux Observer ◽  
Vector Control System

Nowadays a sensor-less vector control system for a motor drive becomes promising to avoid a position sensor. A back electro-motive-force or flux observer is used for sensor-less drive of permanent magnet synchronous motors from middle to high speed range. Thus, the estimation accuracy of the observer influences sensor-less drive performance. This paper proposes a sensor-less vector control system using the H? flux observer in which the observer gain is designed based on the H? control theory. This observer is insensitive to high frequency disturbances such as voltage disturbance due to non-linearity of PWM voltage source inverter, measurement noise of current sensors, and modeling errors. So, the total performance of a sensor-less control system is enhanced. The detailed configuration of the H? flux observer is described in this paper. Simulation results are compared with the conventional full-order flux observer-based sensor-less system.

Design of Matrix Converter Vector Control System Based on DSP and CPLD

2011 ◽  
Vol 413 ◽  
pp. 184-189
Author(s):  
Xiang Ju Jiang ◽  
Er Lin Liu
Keyword(s):  
Control System ◽  
Vector Control ◽  
Control Strategy ◽  
Digital Signal Processor ◽  
Asynchronous Motor ◽  
Digital Signal ◽  
Matrix Converter ◽  
System Structure ◽  
The Matrix ◽  
Vector Control System

Matrix converter is a kind of power electric converter by AC-AC transformation with its excellent input and output characteristics.After analysis of matrix converter system structure in the paper,a digital signal processor based on DSP and CPLD is designed. The design includes the hardware structure and the program flowsheet.DSP and CPLD is the core of the matrix converter - Asynchronous motor vector control system, including system main circuit, other peripheral hardware circuit, control and protection circuits, software design process and so on. The hardware control strategy and software realization scheme of the system are discussed in detail. The experimental results verify that the control strategy of the system is valid and the design of the software and hardware are reasonable.

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