journal 3

Ain Shams Engineering Journal, 2016

In this paper, the system of the Linear Induction Motor (LIM) driven by direct AC-AC matrix converter is presented and its dynamic performance is briefly compared with the conventional LIM drives based on AC-DC-AC converter. Space-vector pulse-width modulation (SVM) and indirect field oriented control (IFOC) are applied to control the two employed converters. For the sake of comparison, the PI controllers are applied to control the primary (mover) speed and current considering the same parameter settings. The objective of this paper was to compare theoretically the dynamic performance of linear induction motor (single-sided LIM) drives driven by three-phase voltage source inverters and the direct AC/AC matrix converters. The study compares the dynamic performance in addition to the harmonics content and THD of the input and output voltage and current for both converters. The simulation of each system has been implemented using the MATLAB/SIMULINK platform.

Matrix converter is a direct AC-AC converter topology that directly converts energy from an AC source to an AC load without the need of a bulky and limited lifetime energy storage element. Due to the significant advantages offered by matrix converter, such as adjustable power factor, capability of regeneration and high quality sinusoidal input/output waveforms. Matrix converter has been one of the AC–AC topologies that hasreceived extensive research attention for being an alternative to replace traditional AC-DC-AC converters in the variable voltage and variable frequency AC drive applications. In the present paper an indirect space vector modulated matrix converter is proposed. The basic idea of an indirect modulation scheme is to separately apply SVM to the rectification and inversion stages, before combining their switching states to produce the final gating signals. The paper encompasses development of a laboratory prototype of 230V, 250VA three phase to three phase DSP controlled matrix converter fed induction motor drive. The observations and real time testings have been carried out to evaluate and improve the stability of system under various typical abnormal input voltage conditions

2021

This paper aims to present a new model of the singlestage direct control of DC machines fed with an AC voltage source using a Single-Phase Matrix Converter (SPMC). The proposed system uses a single circuit topology to perform four-quadrant control operations. Besides, enabling four quadrants control operation, the proposed circuit topology can be controlled to provide almost unity power factor operation using the supply current wave shaping technique. It features low power losses resulting in high power density. The theoretical model of the switching algorithms of the SPMC is utilized to control the desired output according to the characteristics of quadrant I, II, III, and IV operations. The simulation model of the proposed converter is developed using MATLAB/Simulink to investigate the circuit behaviors. The selected results are presented to verify the proposed converter.

— Single-phase induction motors are widely used in home appliances and industrial control. The multispeed operation and multipurpose operation are provided by controlling the speed of these motors. This research paper is variable speed drive of induction motor using frequency control method. It is to develop the solid state control system to be reliable and economically feasible to use with fractional horse power motors. The proposed variable speed drive includes power conversion section (AC to DC and DC to AC), used the switching element of IRF 840 N-channel MOSFET. The four IRF 840 MOSFETS are used as H-bridge inverter to provide the alternating current to the motor. In this drive, C124 transistors and MJE 13002 transistors are used as driver circuit to drive the H-bridge inverter. There are two power supplies in this drive. The 12 V power supply is used for frequency control circuit and driver circuit. The 300 V power supply is used for H-bridge inverter. In this drive, pulse width modulation SG3525A IC is used to control the frequency. The frequency range of the constructed variable drive circuit is 16 Hz to 56 Hz at constant voltage for changing the speed of induction motor. In this research paper, drive schemes of single-phase induction motor, principle operations of components used in constructed variable speed drive, and design calculation to construct this drive are included. Moreover, the experimental tests of this drive when driving a fractional horse power single-phase induction motor are described.

Journal of electrical and electronic systems research, 2021

This paper aims to present a new model of the singlestage direct control of DC machines fed with an AC voltage source using a Single-Phase Matrix Converter (SPMC). The proposed system uses a single circuit topology to perform four-quadrant control operations. Besides, enabling four quadrants control operation, the proposed circuit topology can be controlled to provide almost unity power factor operation using the supply current wave shaping technique. It features low power losses resulting in high power density. The theoretical model of the switching algorithms of the SPMC is utilized to control the desired output according to the characteristics of quadrant I, II, III, and IV operations. The simulation model of the proposed converter is developed using MATLAB/Simulink to investigate the circuit behaviors. The selected results are presented to verify the proposed converter.

2017

Pulse Width Modulation (PWM) techniques are widely used in PV-operated, inverter-controlled AC motor drives. The frequency and magnitude of the voltage applied to the motors are controlled using PWM-based PV-operated drives. PWM is the standard approach for operating the inverter in order to generate high quality output voltage. In past decades, the performance of the PWM techniques were determined using power factor, transient response and efficiency, which play a major role in the regulation of PWM inverters so that a dynamic response can be obtained in grid-connected facilities. Conventional PWM such as PWM, Sinusoidal PWM (SPWM) and Space-Vector PWM (SVPWM) perform satisfactorily in terms of average switching frequency requirement, switching losses and DC bus current ripple, with respect to driving AC induction motors. However, they have poor harmonic characteristics leading to degradation of torque and speed profile of AC motor. In order to overcome the aforementioned drawback,...

2008

A novel control technique based on the well-known selective harmonic elimination pulse-width modulation (PWM-SHE) method suitable for a single-phase matrix converter is presented in this paper. An intergraded mathematical model presenting PWM-SHE with power factor correction scheme is first developed. The proposed technique enables linear control of the fundamental component of the output voltage, improves the input power factor, and also eliminates the low-order harmonics. Various operating points with different output frequencies are reported. The parameters used to assess the performance of the converter controlled by the proposed technique are the input harmonic distortion factor, the total input power factor, and the output voltage total harmonic distortion factor. The theoretical predictions are verified through simulation studies using the PSIM software package.

Electrical Drives play a vital role in domestic and industrial applications throughout the world. Electrical drive offers a convenient means for controlling the operation of different equipment used in industry. In the present scenario almost 80% industrial drives are asynchronous induction motor based drives. In general the speed control of induction motor is achieved by employing converter topologies like AC-DC-AC, cyclo-converter etc. However, these converter topologies have several issues such as DC link capacitor losses, bulky size of the converter etc. The proposed Matrix Converter (MC) is one of the new power converter topologiesthat eliminate DC link capacitor and converts fixed frequency power supply to variable frequency in single stage.Modeling and simulation of a typical 3HP, 415V, 3-phase Matrix Converter fed Induction Motor drive is presented in this paper. Current THD analysis shows the promising performance of the proposed converter topology for induction motor drive.

Anbar journal for engineering sciences/Mağallaẗ al-anbār li-l-ʻulūm al-handasiyyaẗ, 2024

2014

The matrix converter connects the three-phase power supply with the three-phase load directly through a switching matrix composed of four-quadrant switches. In order to evaluate and improve the performance of matrix converter, some experimental tests in typical abnormal conditions have been carried out. The basic topology of Matrix Converter (MC) consists of a three-phase MC consists of nine bidirectional switches, which allow pulse width modulation (PWM) control of input currents and output voltages. The maximum line-line output voltage of the matrix converter must not be greater than the minimum line-line input voltage. An often-cited drawback to the matrix converter is the theoretical voltage conversion limit of 0.86. When high dynamic performance and precision control are required for an induction motor in a wide speed range, the speed must normally be measured. In contrast, in the case of medium and low performance applications, sensorless control without measuring the motor speed is desirable as they tend to reduce system reliability when working in hostile environments. This also describes the working principle, space vector modulation strategy of matrix converter, characteristics of fuzzy control, and the basic principle of adaptive fuzzy PID. The use of fuzzy makes the control of matrix converter more reasonable. Combining fuzzy control and closed-loop control can effectively improve the input and output waveforms of matrix converter.