scholarly journals Mathematical Modelling, Analysis and Control of a Three to Five-Phase Matrix Converter for Minimal Switching Losses

Mathematics ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 96
Author(s):  
Kotb B. Tawfiq ◽  
Mohamed N. Ibrahim ◽  
Hegazy Rezk ◽  
Elwy E. El-kholy ◽  
Peter Sergeant
Keyword(s):  
Control Method ◽  
Essential Feature ◽  
Matrix Converter ◽  
Control Technique ◽  
Switching Losses ◽  
Wide Range ◽  
Indirect Technique ◽  
Drive Systems ◽  
Vector Modulation ◽  
And Control

The interest in motor drive systems with a number of phases greater than three has increased, mainly in high-power industrial fields due to their advantages compared with three-phase drive systems. In this paper, comprehensive mathematical modeling of a five-phase matrix converter (MC) is introduced. Besides that, the direct and indirect space vector modulation (SVM) control methods are compared and analyzed. Furthermore, a mathematical model for the MC with the transformation between the indirect and direct topology is constructed. The indirect technique is used to control the five-phase MC with minimum switching losses. In this technique, SVM deals with a five-phase MC as a virtual two-stage converter with a virtual DC link (i.e., rectifier and inverter stages). The voltage gain is limited to a value of 0.79. Moreover, to analyze the effectiveness of the control technique and the advantages of the MC, a static R-L load is employed. However, the load can also be an industrial load, such as hospital pumping or vehicular applications. The presented analysis proves that the MC gives a wide range of output frequencies, and it has the ability to control the input displacement factor and the output voltage magnitude. In addition, the absence of the massive DC link capacitors is an essential feature for the MC, resulting in increased reliability and a reduced size converter. Eventually, an experimental validation is conducted on a static load to validate the presented model and the control method. It is observed that good matching between the simulation and the experimental results is achieved.

Wide‐range adjustable speed control method for dual‐motor drive systems

2015 ◽  
Vol 9 (2) ◽  
pp. 107-116 ◽  
Author(s):  
Shao‐Kai Tseng ◽  
Chih‐Chien Tseng ◽  
Tian‐Hua Liu ◽  
Jui‐Ling Chen
Keyword(s):  
Control Method ◽  
Speed Control ◽  
Motor Drive ◽  
Wide Range ◽  
Adjustable Speed ◽  
Drive Systems

Modelling and control of manipulators with flexible links working on land and underwater environments

Robotica ◽  
2010 ◽  
Vol 29 (3) ◽  
pp. 461-470 ◽  
Author(s):  
Levent Gümüşel ◽  
Nurhan Gürsel Özmen
Keyword(s):  
Fuzzy Control ◽  
Control Method ◽  
Robot Manipulator ◽  
Control Methods ◽  
Control Laws ◽  
Linear Ordinary Differential Equations ◽  
Intelligent Technique ◽  
Wide Range ◽  
Classical Control ◽  
And Control

SUMMARYIn this study, modelling and control of a two-link robot manipulator whose first link is rigid and the second one is flexible is considered for both land and underwater conditions. Governing equations of the systems are derived from Hamilton's Principle and differential eigenvalue problem. A computer program is developed to solve non-linear ordinary differential equations defining the system dynamics by using Runge–Kutta algorithm. The response of the system is evaluated and compared by applying classical control methods; proportional control and proportional + derivative (PD) control and an intelligent technique; integral augmented fuzzy control method. Modelling of drag torques applied to the manipulators moving horizontally under the water is presented. The study confirmed the success of the proposed integral augmented fuzzy control laws as well as classical control methods to drive flexible robots in a wide range of working envelope without overshoot compared to the classical controls.

scholarly journals Designing Stipulated Gains of Aircraft Stability and Control Augmentation Systems for Semiglobal Trajectories Tracking

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Mohamed Mostafa Y. B. Elshabasy ◽  
Yongki Yoon ◽  
Ashraf Omran
Keyword(s):  
Control Method ◽  
Simple Procedure ◽  
Operating Conditions ◽  
Stability And Control ◽  
Wide Range ◽  
Flight Envelope ◽  
The Stability ◽  
Classical Control ◽  
And Control ◽  
Aircraft Stability And Control

The main objective of the current investigation is to provide a simple procedure to select the controller gains for an aircraft with a largely wide complex flight envelope with different source of nonlinearities. The stability and control gains are optimally devised using genetic algorithm. Thus, the gains are tuned based on the information of a single designed mission. This mission is assigned to cover a wide range of the aircraft’s flight envelope. For more validation, the resultant controller gains were tested for many off-designed missions and different operating conditions such as mass and aerodynamic variations. The results show the capability of the proposed procedure to design a semiglobal robust stability and control augmentation system for a highly maneuverable aircraft such as F-16. Unlike the gain scheduling and other control design methodologies, the proposed technique provides a semi-global single set of gains for both aircraft stability and control augmentation systems. This reduces the implementation efforts. The proposed methodology is superior to the classical control method which rigorously requires the linearization of the nonlinear aircraft model of the investigated highly maneuverable aircraft and eliminating the sources of nonlinearities mentioned above.

Nonlinear Thermal Modelling and Control of a PEM Fuel Cell Stack

2005 ◽  
Author(s):  
Jason R. Kolodziej
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Control Method ◽  
Pem Fuel Cell ◽  
Proton Exchange ◽  
Control Technique ◽  
Coolant Temperature ◽  
Fuel Cell Stack ◽  
Nonlinear Control Method ◽  
And Control

The purpose of this paper is to present a nonlinear control method for accurately maintaining coolant temperature within a proton exchange membrane (PEM) fuel cell stack by controlling coolant flow rate. Due to the current sensitive nature of the membrane and a strict relative humidity requirement it is critical to precisely control the internal temperature of the fuel cell. First, an optimization-based parameter identification is applied to determine unknown coefficients to the nonlinear thermal model of the fuel cell stack. The stack is modelled according to a lumped parameter Continuous-flow Stirred Tank Reactor (CSTR) form. The paper then presents a nonlinear disturbance rejection control technique to accomplish the necessary temperature control. Experimental data from a 17-cell fuel cell stack is used for both the modelling and control portions of this work.

A wide-range adjustable speed control method for multi-motor drive systems

2013 ◽  
Author(s):  
Tian-Hua Liu ◽  
Chih-Chien Tseng ◽  
Jui-Ling Chen ◽  
Jian-Feng Tsai ◽  
Chien-Hsun Wu
Keyword(s):  
Control Method ◽  
Speed Control ◽  
Motor Drive ◽  
Wide Range ◽  
Adjustable Speed ◽  
Drive Systems

scholarly journals Control of Matrix Converter for AC Drives by Proposed Indirect Space Vector Modulation ISVM Strategy

2019 ◽  
Vol 54 (5) ◽  
Author(s):  
Alyaa Muhsen ◽  
Ali Salam Al-Khayyat ◽  
Mustafa Jameel Hameed
Keyword(s):  
Matrix Converter ◽  
Control Technique ◽  
Modulation Method ◽  
Space Vector Modulation ◽  
Unity Power Factor ◽  
Ac Drives ◽  
Voltage Ratio ◽  
Variable Voltage ◽  
Input Side ◽  
Vector Modulation

Matrix Converter is considered as a forced commutated AC-to-AC converter, where an array of bidirectional controlled switches produces variable voltage and frequency. This paper presents amodulation approach to MC operation: a fictitious DC link control technique, which is also known as the Indirect Modulation method and is characterized by lack of reactive storage components in the DC link. This method allows the bidirectional power to flow between the source and load, and thus raise the voltage ratio above 86.6%, control the desired magnitude and frequency, and achieve nearly unity power factor at the input side of the converter.

High-Speed Atomic Force Microscope Technology：A Review

2021 ◽  
Vol 17 ◽  
Author(s):  
Ke Xu ◽  
Qiang An ◽  
Peng Li
Keyword(s):  
High Resolution ◽  
Atomic Force Microscope ◽  
High Speed ◽  
Control Method ◽  
Scanning Speed ◽  
Atomic Force ◽  
Wide Range ◽  
Working Principle ◽  
And Control ◽  
Dynamics Process

: The atomic force microscope (AFM) is widely used in many fields such as biology, materials, and physics due to its advantages of simple sample preparation, high-resolution topography measurement and wide range of applications. However, the low scanning speed of traditional AFM limits its dynamics process monitoring and other further application. Therefore, the improvement of AFM scanning speed has become more and more important. In this review, the working principle of AFM is first proposed. Then, we introduce the improvements of cantilever, drive mechanism, and control method of the high-speed atomic force microscope (HS-AFM). Finally, we provide the next developments of HS-AFM.

Mitigation of Wind-Rain-Induced Cable Vibration in Cable-Stayed Bridges: Energy Cost Assessment

2011 ◽  
Vol 105-107 ◽  
pp. 1165-1169
Author(s):  
Ling Yun Wang ◽  
Quan Feng Wang
Keyword(s):  
Energy Cost ◽  
Control Method ◽  
Control Technique ◽  
Stay Cable ◽  
External Energy ◽  
Design Guideline ◽  
Significant Control ◽  
Cable Vibrations ◽  
Control Forces ◽  
And Control

The cables in a cable-stayed bridge usually possess low inherent damping and are prone to vibrate by many factors. The wind-rain-induced vibration of the prototype stay cable is a special vibration problem associating with rain and wind. Many methods have been proposed to mitigate wind-rain-induced cable vibrations such as mechanical measures, aerodynamic modification, and control technology. Active control technique has significant control capability because of utilizing the external energy supply but it may not be realistic to large civil engineering structure due to enormous power demand. The two-stage control method has been proposed to control the wind-rain-induced cable vibrations of the prototype stay cable. The studies are carried out to investigate the energy cost features of the control forces as a design guideline.

scholarly journals Dynamics, Chaos Control, and Synchronization in a Fractional-Order Samardzija-Greller Population System with Order Lying in (0, 2)

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
A. Al-khedhairi ◽  
S. S. Askar ◽  
A. E. Matouk ◽  
A. Elsadany ◽  
M. Ghazel
Keyword(s):  
Fractional Order ◽  
Chaos Control ◽  
Control Method ◽  
Control Technique ◽  
Linear Feedback ◽  
Nonlinear Feedback ◽  
Population System ◽  
Wide Range ◽  
Control And Synchronization ◽  
Fractional Parameter

This paper demonstrates dynamics, chaos control, and synchronization in Samardzija-Greller population model with fractional order between zero and two. The fractional-order case is shown to exhibit rich variety of nonlinear dynamics. Lyapunov exponents are calculated to confirm the existence of wide range of chaotic dynamics in this system. Chaos control in this model is achieved via a novel linear control technique with the fractional order lying in (1, 2). Moreover, a linear feedback control method is used to control the fractional-order model to its steady states when 0<α<2. In addition, the obtained results illustrate the role of fractional parameter on controlling chaos in this model. Furthermore, nonlinear feedback synchronization scheme is also employed to illustrate that the fractional parameter has a stabilizing role on the synchronization process in this system. The analytical results are confirmed by numerical simulations.

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