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Author: Youqi Guo Publisher: ISBN: Category : Languages : en Pages : 66
Book Description
Power converters are electronic circuits for conversion, control and regulation of electric power for various applications, such as from tablet computers in milliwatts to electric power systems at megawatts range. There are three basic types of power converters: buck (output voltage less than the input voltage), boost (output voltage higher than the input voltage) and buck-boost converters. The reliability of the power converters has become an essential focus of industrial applications. This research presents modeling and control of DC/DC boost converter using several control methods, such as Proportional-Integral (PI), Linear Quadratic Regulator (LQR) control, and nonlinear control concepts. Based on standard circuit laws, a mathematical model of the boost converter is derived which is expressed as a bilinear system. First a small signal model of the converter is derived to analyze the small deviations around the steady-state operating point which is used to develop closed loop control using the PI and the LQR methods. Simulation results show that the performance of the converter is good for operation around the operating state, however is unacceptable if there are large variations in the load or the reference input. To improve the performance of the closed loop system, the nonlinear control concept is used which shows excellent closed loop performance under large variations of load or setpoint. Comparative simulation results are presented for closed loop performance under various types of disturbances including random variations in load.
Author: Youqi Guo Publisher: ISBN: Category : Languages : en Pages : 66
Book Description
Power converters are electronic circuits for conversion, control and regulation of electric power for various applications, such as from tablet computers in milliwatts to electric power systems at megawatts range. There are three basic types of power converters: buck (output voltage less than the input voltage), boost (output voltage higher than the input voltage) and buck-boost converters. The reliability of the power converters has become an essential focus of industrial applications. This research presents modeling and control of DC/DC boost converter using several control methods, such as Proportional-Integral (PI), Linear Quadratic Regulator (LQR) control, and nonlinear control concepts. Based on standard circuit laws, a mathematical model of the boost converter is derived which is expressed as a bilinear system. First a small signal model of the converter is derived to analyze the small deviations around the steady-state operating point which is used to develop closed loop control using the PI and the LQR methods. Simulation results show that the performance of the converter is good for operation around the operating state, however is unacceptable if there are large variations in the load or the reference input. To improve the performance of the closed loop system, the nonlinear control concept is used which shows excellent closed loop performance under large variations of load or setpoint. Comparative simulation results are presented for closed loop performance under various types of disturbances including random variations in load.
Author: Hebertt J. Sira-Ramirez Publisher: Springer Science & Business Media ISBN: 1846284597 Category : Technology & Engineering Languages : en Pages : 432
Book Description
This book deals specifically with control theories relevant to the design of control units for switched power electronics devices, for the most part represented by DC–DC converters and supplies, by rectifiers of different kinds and by inverters with varying topologies. The theoretical methods for designing controllers in linear and nonlinear systems are accompanied by multiple case studies and examples showing their application in the emerging field of power electronics.
Author: Shyama M. Publisher: LAP Lambert Academic Publishing ISBN: 9783659135392 Category : Languages : de Pages : 76
Book Description
Issues in the design and implementation of digital controllers for a DC-DC converter using linear and nonlinear control methods were investigated in this dissertation. The small signal models of the buck converter, obtained using standard state space averaging techniques, were utilized.PID controllers were designed for generic buck converter using standard frequency response techniques.The small signal models of the converters change with the variations of the operating point. Since the linear controllers were designed based on the small signal models, they were not able to respond effectively to changes in operating point. To achieve a stable and fast response, nonlinear control methods were applied to the buck converter. Since fuzzy controllers don t require a precise mathematical model, they are well suited to nonlinear, time-variant systems. Fuzzy controllers were designed for the buck converter. Fuzzy systems can handle non-linear characteristics. They can be designed to adapt to varying operating points. By using fuzzy controllers we can reduce both overshoot percentage and settling time. It is implemented using TMS320C6713
Author: Yaser Mohammadian Roshan Publisher: ISBN: Category : Languages : en Pages : 131
Book Description
In this thesis, we investigate the development of novel control schemes for single and three phase boost converters operated in different modes of conduction. Study is conducted on development of controllers based on the nonlinear dynamic characteristics of the converters and characteristics such as nonminimum phase behavior in boost converters that give rise to control challenges. The control strategies are further applied to certain areas in sustainable energy systems including maximum power point tracking of photovoltaic panels, load current control of power converters, and energy regenerative suspension in vehicular systems. To this end, the analytical behavior of a boost converter is studied and utilized to design nonlinear controllers to control the input resistive behavior of the converter. The performance of proposed controllers are verified through simulations and experiments on single stage converters. Finally, the design of a feedback control system for input resistance control of a three-phase bidirectional converter is studied. A sliding mode controller is utilized in an application involving energy regeneration for a mechanical suspension system. A permanent magnet machine and a linear vibration generator are utilized along with the proposed control strategy to achieve regenerative damping in a proof-of-concept suspension system. The simulation and experimental results verify that the proposed controller can successfully provide desired damping for mechanical vibrations while storing the vibration energy in battery.
Author: Ghulam Abbas Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
The objective of the thesis is to design the discrete compensators which counteract the nonlinearities introduced by various elements in the digital control loop while delivering high dynamic performance, fast time-to-market and scalability. Excellent line and fast load transient response, which is a measure of the system response speed, with minimal achievable voltage deviation and a fast voltage recovery time for a given power stage can be achieved through the discrete compensators designed on the basis of linear and nonlinear control techniques. To achieve a stable and fast response, the thesis proposes two ways. One way is to use linear control techniques to design the discrete compensator while keeping the bandwidth higher. It is well-known fact that the higher the bandwidth, the faster is the transient response. Achieving higher bandwidth through linear control techniques sometimes becomes tricky. All those situations are highlighted in the thesis. The other way is to hybridize the linear control techniques with the nonlinear control techniques such as fuzzy logic or neural network based control techniques. Simulation results verify that hybridization of nonlinear controllers with the linear ones have better dynamic performance over linear controllers under the change of operating points. Along with using the two methodologies described above, the thesis also investigates the pole-zero cancellation (PZC) technique in which the poles and zeros of the compensator are placed in such a way that they cancel the effect of the poles or zeros of the buck converter to boost the phase margin at the required bandwidth. Some modifications are also suggested to the classical control techniques based digital controllers to improve the dynamic performance. The thesis highlights the nonlinearities which degrade the performance, a cost-effective solution that achieves good performance and the mysteries of digital control system. A graphical user interface is introduced and demonstrated for use with the design of a synchronous-buck converter. In summary, this thesis mainly describes the analysis, design, simulation, optimization, implementation and cost effectiveness of digital controllers with particular focus on the analysis and the optimization of the dynamic performance for high-frequency low-power DC-DC buck converter working in continuous conduction mode (CCM) operating at a switching frequency of 1 MHz using linear and nonlinear control techniques in a very sequential and comprehensive way.
Author: Ivan Zelinka Publisher: Springer Science & Business Media ISBN: 3642419682 Category : Technology & Engineering Languages : en Pages : 635
Book Description
Over the past decades, fault diagnosis (FDI) and fault tolerant control strategies (FTC) have been proposed based on different techniques for linear and nonlinear systems. Indeed a considerable attention is deployed in order to cope with diverse damages resulting in faults occurrence.
Author: Valery D. Yurkevich Publisher: World Scientific ISBN: 9812388990 Category : Technology & Engineering Languages : en Pages : 374
Book Description
This unique book presents an analytical uniform design methodology of continuous-time or discrete-time nonlinear control system design which guarantees desired transient performances in the presence of plant parameter variations and unknown external disturbances. All results are illustrated with numerical simulations, their practical importance is highlighted, and they may be used for real-time control system design in robotics, mechatronics, chemical reactors, electrical and electro-mechanical systems as well as aircraft control systems. The book is easy reading and is suitable for teaching.
Author: Hebertt Sira-Ramirez Publisher: Butterworth-Heinemann ISBN: 9780128498682 Category : Science Languages : en Pages : 0
Book Description
Active Disturbance Rejection Control of Dynamic Systems: A Flatness Based Approach describes the linear control of uncertain nonlinear systems. The net result is a practical controller design that is simple and surprisingly robust, one that also guarantees convergence to small neighborhoods of desired equilibria or tracking errors that are as close to zero as desired. This methodology differs from current robust feedback controllers characterized by either complex matrix manipulations, complex parameter adaptation schemes and, in other cases, induced high frequency noises through the classical chattering phenomenon. The approach contains many of the cornerstones, or philosophical features, of Model Free Control and ADRC, while exploiting flatness and GPI control in an efficient manner for linear, nonlinear, mono-variable and multivariable systems, including those exhibiting inputs delays. The book contains successful experimental laboratory case studies of diverse engineering problems, especially those relating to mechanical, electro-mechanical, robotics, mobile robotics and power electronics systems.
Author: O.V. Gnana Swathika Publisher: CRC Press ISBN: 1000537900 Category : Computers Languages : en Pages : 747
Book Description
A smart building is the state-of-art in building with features that facilitates informed decision making based on the available data through smart metering and IoT sensors. This set provides useful information for developing smart buildings including significant improvement of energy efficiency, implementation of operational improvements and targeting sustainable environment to create an effective customer experience. It includes case studies from industrial results which provide cost effective solutions and integrates the digital SCADE solution. Describes complete implication of smart buildings via industrial, commercial and community platforms Systematically defines energy-efficient buildings, employing power consumption optimization techniques with inclusion of renewable energy sources Covers data centre and cyber security with excellent data storage features for smart buildings Includes systematic and detailed strategies for building air conditioning and lighting Details smart building security propulsion. This set is aimed at graduate students, researchers and professionals in building systems, architectural, and electrical engineering.
Author: Youqi Guo
Author: Youqi Guo
Author: 
Author: Hebertt J. Sira-Ramirez
Author: Shyama M.
Author: Yaser Mohammadian Roshan
Author: Ghulam Abbas
Author: Ivan Zelinka
Author: Valery D. Yurkevich
Author: Hebertt Sira-Ramirez
Author: O.V. Gnana Swathika