Digital Control Of Dynamic Systems This well-respected, market-leading text discusses the use of digital computers in the real-time control of dynamic systems. The emphasis is on the design of digital controls that achieve good dynamic response and small errors while using signals that are sampled in time and quantized in amplitude. Digital Control of Dynamic Systems (3rd Edition): Franklin ... This well-respected, market-leading text discusses the use of digital computers in the real-time control of dynamic systems. The emphasis is on the design of digital controls that achieve good dynamic response and small errors while using signals that are sampled in time and quantized in amplitude. Digital Control of Dynamic Systems: Gene F. Franklin ... Digital Control of Dynamic Systems, 2nd Edition. Gene F. Franklin, Stanford University. J. David Powell, Stanford University Digital Control of Dynamic Systems, 2nd Edition Pearson This well-respected work discusses the use of digital computers in the real-time control of dynamic systems. The emphasis is on the design of digital controls that achieve good dynamic response and small errors while using signals that are sampled in time and quantized in amplitude. MATLAB statements and problems are thoroughly and carefully integrated throughout the book to offer readers a complete design picture. Digital Control of Dynamic Systems, 3rd Edition ... Digital control of dynamic systems | Gene F. Franklin, J. David Powell, Michael L. Workman | download | B–OK. Download books for free. Find books Digital control of dynamic systems | Gene F. Franklin, J ... Abstract This well-respected work discusses the use of digital computers in the real-time control of dynamic systems. The emphasis is on the design of digital controls that achieve good dynamic... (PDF) Digital Control of Dynamic Systems Digital Control of Dynamic Systems, Addison.pdf There is document Digital Control of Dynamic Systems, Addison.pdfavailable here for reading and downloading. Use the download button below or simple online reader. The file extension PDFand ranks to the Documentscategory. Digital Control of Dynamic Systems, Addison.pdf Download ... Automatic control is the science that develops techniques to steer, guide, control dynamic systems. These systems are built by humans and must perform a specific task. Examples of such dynamic systems are found in biology, physics, robotics, finance, etc. Digital Control means that the control laws are implemented in a digital device, such as a microcontroller or a microprocessor. Introduction to Digital Control of Dynamic Systems And ... The discussions are clear, nomenclature is not hard to follow and there are plenty of worked examples. The book covers discretization effects and design by emulation (i.e. design of continuous-time control system followed by discretization before implementation) which are not to be found on every book on digital control. Amazon.com: Customer reviews: Digital Control of Dynamic ... Find helpful customer reviews and review ratings for Digital Control of Dynamic Systems (3rd Edition) at Amazon.com. Read honest and unbiased product reviews from our users. Amazon.com: Customer reviews: Digital Control of Dynamic ... 1.1.2 Digital control Digital control systems employ a computer as a fundamental component in the controller. The computer typically receives a measurement of the controlled variable, also often receives the reference input, and produces its output using an algorithm. Introduction to Applied Digital Control From the Back Cover This well-respected, marketleading text discusses the use of digital computers in the real-time control of dynamic systems. The emphasis is on the design of digital controls that achieve good dynamic response and small errors while using signals that are sampled in time and quantized in amplitude. Digital Control of Dynamic Systems (3rd Edition) Test Bank `Among the advantages of digital logic for control are the increased flexibility `of the control programs and the decision-making or logic capability of digital `systems, which can be combined with the dynamic control function to meet `other system requirements. `The digital controls studied in this book are for closed-loop (feedback) Every day, eBookDaily adds three new free Kindle books to several different genres, such as Nonfiction, Business & Investing, Mystery & Thriller, Romance, Teens & Young Adult, Children's Books, and others.

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Digital control of dynamic systems

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Power Electronics Converters Applications And Design

This paper analyzes the effects of unbalanced voltage on doubly fed induction generators. It also presents a novel control strategy based on direct power control (DPC+) applied to this type of generators, predominant in wind energy applications, that enables them to work under perturbed conditions and achieve optimum results. Although the technique can be implemented to control both rotor converters and grid converters, we will hereby exemplify the former which regulates stator active and reactive power. The results obtained with DPC+ are then compared through experimental tests to indicate that the technique is suitable and achieves good dynamic responses while controlling current distortion, power or torque oscillations. The validation of results has been performed through experimental tests on a 20-kW generator.

Direct Power Control Applied to Doubly Fed Induction Generator Under Unbalanced Grid Voltage Conditions

In this paper, a new three-phase, five-level inverter topology with a single-dc source is presented. The proposed topology is obtained by cascading a three-level flying capacitor inverter with a flying H-bridge power cell in each phase. This topology has redundant switching states for generating different pole voltages. By selecting appropriate switching states, the capacitor voltages can be balanced instantaneously (as compared to the fundamental) in any direction of the current, irrespective of the load power factor. Another important feature of this topology is that if any H-bridge fails, it can be bypassed and the configuration can still operate as a three-level inverter at its full power rating. This feature improves the reliability of the circuit. A 3-kW induction motor is run with the proposed topology for the full modulation range. The effectiveness of the capacitor balancing algorithm is tested for the full range of speed and during the sudden acceleration of the motor.

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A Five-Level Inverter Topology with Single-DC Supply by Cascading a Flying Capacitor Inverter and an H-Bridge

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Vector Control And Dynamics Of Ac Drives

The inherent low switching frequency in medium-voltage alternating-current industrial drives presents power-quality and filter-design challenges. In this paper, four multilevel pulsewidth-modulation methods; phase disposition (PD), switching-loss minimization (SLM), and selective harmonic elimination (SHE) up to the 17th and 29th harmonics, respectively, are considered. The characteristics of long-cable effects on common-mode voltage (CMV) and differential-mode voltage (DMV), inverter losses and efficiency, induction machine voltage, and current harmonics are analyzed. Very little has been published in these quantitative comparisons. It is shown that the SHE method has reduced CMV as compared with the PD and SLM algorithms. Elimination of up to the 29th harmonic achieves the best harmonic performance without needing an output filter, at the expense that the losses are higher with a lower efficiency. Analytical and simulation results using the Piecewise Linear Electrical Circuit Simulation for the power-electronic circuits and MATLAB/Simulink for control systems are experimentally verified with a 1000-hp 4160-V neutral-point-clamped adjustable-speed-drive system that includes a 24-pulse front-end voltage source converter.

Quantitative Power Quality and Characteristic Analysis of Multilevel Pulsewidth-Modulation Methods for Three-Level Neutral-Point-Clamped Medium-Voltage Industrial Drives

Adjustable speed drives (ASDs) have become the primary choice for most new and retrofit precision motor-control applications with increased system efficiencies and reduced system losses. The significant increase in the use of ASDs brings the need for understanding compatibility issues between them and their electrical environment in order to design the electrical systems appropriately. Even though there has been numerous studies on ASD effects on power systems, models for predicting the effect of the source voltage sags or unbalance have been limited. This paper is devoted to analyze the characteristics of input current harmonics on the utility side and the distribution transformer K-factor for practical ASD systems under input voltage unbalance and sag conditions. The relationships between the unbalanced input voltages and input current harmonics, the input inductance and the input current harmonics, transformer K-factor are explored for 5 hp, 100 hp and 600 hp power distribution systems with ASDs. The results can be used as a design guide for power distribution system design with ASDs. Theoretical derivations, simulation and experimental results are presented in this paper.

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Source current harmonic analysis of adjustable speed drives under input voltage unbalance and sag conditions

Since the Doubly Fed Induction Generator (DFIG) converters are designed by the slip power (a fraction 25-30% of the total power) to achieve full control of the generator, there is not enough capacity to provide reactive power when the voltage dips below the tolerable grid voltage level at the Point of Common Coupling (PCC). We propose in this paper to use the Static Synchronous Compensator (STATCOM) for compensating the grid voltage dip to improve the power quality in a weak grid or asymmetrical load. The simplified active and reactive power control strategies of a 6 MVA wind farm with DFIG are described. The Maximal Power Point Tracking (MPPT) algorithm is implemented. The simulation results using the platform between Matlab/Simulink and PLECS demonstrate the good performance of the wind farm with DFIG and STATCOM, validating the analytical conclusions.

Simplified Active and Reactive Power Control of Doubly Fed Induction Generator and the Simulation with STATCOM

A system for controlling operation of a motor drive during fast start-up of an induction motor includes an AC motor drive having a PWM inverter and a control system to generate a command signal to cause the PWM inverter to control an output of the AC motor drive. The control system includes a start-up modulator that is selectively operable during start-up acceleration of the AC motor, the start-up modulator programmed to determine a motor current applied to the AC motor and a voltage of a DC bus, generate a first frequency offset that causes a frequency reference of the command signal to be decreased when the motor current is greater than a reference current threshold, and generate a second frequency offset that causes the frequency reference of the command signal to be increased when the DC bus voltage is greater than a reference voltage threshold.

System and method for fast start-up of an induction motor

Utility power quality problems like input voltage unbalance and sag conditions severely stress diode bridge rectifiers used in adjustable-speed drive (ASD) equipment. The key phenomenon that causes these problems is the transition of the rectifier from three-phase to single-phase operation. This is accompanied by increased harmonic currents that shorten the dc-bus capacitor life span. In addition, the bus ripple voltage causes undesired harmonic phase currents in Volts-per-Hertz ac drives, leading to elevated machine heating and the generation of pulsating torque at the second line harmonic (i.e., 120 Hz). This paper develops closed-form expressions that lay a solid foundation to analyze and quantify these phenomena, making it much easier to investigate alternative mitigation strategies. The paper identifies the boundary conditions that determine the entry of the rectifier stage into single-phase operation under unbalanced voltage sag conditions. Closed-form equations for the dc bus voltage and current are derived valid for finite line impedance, finite bus capacitance and varying loads. These expressions make it possible to conveniently conduct parametric studies of the system behavior under wide ranges of operating conditions without resorting to time-consuming time-domain simulations. Simulation and experimental tests are used to verify the accuracy and effectiveness of the analysis by comparing key predicted power quality performance indices (e.g., input power factor, current crest factor, THD) to simulated and measured values using a 5 hp ASD system.

Kevin Lee

Papers

Quantitative Power Quality and Characteristic Analysis of Multilevel Pulsewidth-Modulation Methods for Three-Level Neutral-Point-Clamped Medium-Voltage Industrial Drives

Source current harmonic analysis of adjustable speed drives under input voltage unbalance and sag conditions

Simplified Active and Reactive Power Control of Doubly Fed Induction Generator and the Simulation with STATCOM

System and method for fast start-up of an induction motor

Design-oriented analysis of DC bus dynamics in adjustable speed drives under input voltage unbalance and sag conditions