Download or read book Improved Control for Multilevel Inverters in Grid Applications written by Martin Hofmann and published by . This book was released on 2018 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: Control systems for three-phase grid connected voltage source inverters (VSI) play an important role in energy transformation systems . They are expected to be stable, robust and accurate during steady state as well as different grid faults and disturbances like voltage sags or unbalanced conditions. Caused by increasingly rising grid standards and efficiency requirements the use of multilevel inverter systems in grid connected low voltage applications are getting more and more attention. Nevertheless, the use of these inverter types leads to increased complexity of the control system and the hardware components. This thesis presents an improved control scheme for multilevel inverters in grid applications. The system combines a robust and high-dynamic direct current control scheme called scalar hysteresis.

Download or read book Multilevel Inverters written by Ersan Kabalci and published by Academic Press. This book was released on 2021-03-27 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multilevel Inverters: Control Methods and Power Electronics Applications provides a suite of powerful control methods for conventional and emerging inverter topologies instrumentalized in power electronics applications. It introduces readers to the conventional pulse width modulation control of multilevel voltage source inverter topologies before moving through more advanced approaches including hysteresis control, proportional resonance control, and model predictive control. Later chapters survey the power electronics connection between device topologies and control methods, particularly focusing on conversion in renewable energy systems, electric vehicles, static VAR compensators and solid-state transformers. - Examines modern design configurations for multilevel inverter controllers, emerging control methods, and their applications - Presents detailed application examples of multilevel inverters deployed in modern and recent power electronic areas including renewable energy sources, electric vehicles, and grid management - Discusses deployment and development of future power converter implementation

Download or read book Multilevel Inverters written by Ersan Kabalci and published by Academic Press. This book was released on 2021-02-14 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multilevel Inverters: Topologies, Control Methods, and Applications investigates modern device topologies, control methods, and application areas for the rapidly developing conversion technology. The device topologies section begins with conventional two-level inverter topologies to provide a background on the DC-AC power conversion process and required circuit configurations. Thereafter, multilevel topologies originating from neutral point clamped topologies are presented in detail. The improved and inherited regular multilevel topologies such as flying capacitor and conventional H-bridge topology are presented to illustrate the multilevel concept. Emerging topologies are introduced regarding application areas such as renewable energy sources, electric vehicles, and power systems. The book goes on to discuss fundamental operational principles of inverters using the conventional pulse width modulated control method. Current and voltage based closed loop control methods such as repetitive control, space vector modulation, proportional resonant control and other recent methods are developed. Core modern applications including wind energy, photovoltaics, microgrids, hybrid microgrids, electric vehicles, active filters, and static VAR compensators are investigated in depth. Multilevel Inverters for Emergent Topologies and Advanced Power Electronics Applications is a valuable resource for electrical engineering specialists, smart grid specialists, researchers on electrical, power systems, and electronics engineering, energy and computer engineers. Reviews mathematical modeling and step-by-step simulation examples, straddling both basic and advanced topologies Assesses how to systematically deploy and control multilevel power inverters in application scenarios Reviews key applications across wind energy, photovoltaics, microgrids, hybrid microgrids, electric vehicles, active filters, static VAR compensators

Download or read book Advanced Multilevel Converters and Applications in Grid Integration written by Ali Iftekhar Maswood and published by John Wiley & Sons. This book was released on 2018-10-09 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive survey of advanced multilevel converter design, control, operation and grid-connected applications Advanced Multilevel Converters and Applications in Grid Integration presents a comprehensive review of the core principles of advanced multilevel converters, which require fewer components and provide higher power conversion efficiency and output power quality. The authors – noted experts in the field – explain in detail the operation principles and control strategies and present the mathematical expressions and design procedures of their components. The text examines the advantages and disadvantages compared to the classical multilevel and two level power converters. The authors also include examples of the industrial applications of the advanced multilevel converters and offer thoughtful explanations on their control strategies. Advanced Multilevel Converters and Applications in Grid Integration provides a clear understanding of the gap difference between research conducted and the current industrial needs. This important guide: Puts the focus on the new challenges and topics in related areas such as modulation methods, harmonic analysis, voltage balancing and balanced current injection Makes a strong link between the fundamental concepts of power converters and advances multilevel converter topologies and examines their control strategies, together with practical engineering considerations Provides a valid reference for further developments in the multilevel converters design issue Contains simulations files for further study Written for university students in electrical engineering, researchers in areas of multilevel converters, high-power converters and engineers and operators in power industry, Advanced Multilevel Converters and Applications in Grid Integration offers a comprehensive review of the core principles of advanced multilevel converters, with contributions from noted experts in the field.

Download or read book Multilevel Converters Control Techniques for Renewable Energy Resources written by Sudhakar Babu Thanikanti and published by Frontiers Media SA. This book was released on 2022-01-13 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Multilevel Converters Analysis Modulation Topologies and Applications written by Gabriele Grandi and published by MDPI. This book was released on 2019-10-14 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of scientific papers concerning multilevel inverters examined from different points of view. Many applications are considered, such as renewable energy interface, power conditioning systems, electric drives, and chargers for electric vehicles. Different topologies have been examined in both new configurations and well-established structures, introducing novel and particular modulation strategies, and examining the effect of modulation techniques on voltage and current harmonics and the total harmonic distortion.

Download or read book Single DC Source Multilevel Inverters written by Hani Vahedi and published by Springer. This book was released on 2019-03-23 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this book is to distinguish the single-de-source multilevel inverter topologies and to teach their control, switching and voltage balancing. It includes new information on voltage balancing and control of multilevel inverters. The book answers some important questions about the revolution of power electronics converters: 1- Why multilevel inverter are better than 2-level ones? 2- Why single-de-source multilevel inverters are a matter of interest? 3- What are the redundant switching states and what do they do? 4- How to use redundant switching states in control and voltage balancing? 5- What are the applications of single-de-source multilevel inverters?

Download or read book D STATCOM control with SRFT method for PQ Improvement in a PV system written by Mrs. P. V. S. S. A. Parimala and published by Archers & Elevators Publishing House. This book was released on with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Solar Inverter Design with Improved Performance written by Mona Reyes and published by Mona Reyes. This book was released on 2024-05-08 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The article titled "Solar Inverter Design with Improved Performance" Mona Reyes discusses the design and development of a solar photovoltaic-fed modular multilevel inverter that offers improved power quality and efficiency. The paper explores the various aspects of solar inverters, including power electronics, power conditioning, and power conversion. The author delves into the key issues that need to be addressed to improve the performance of solar inverters, such as maximum power point tracking (MPPT), voltage and current regulation, reactive power compensation, harmonic distortion, power factor correction, and pulse width modulation (PWM). The article also discusses various control methods, such as hysteresis control, sliding mode control, fuzzy logic control, neural networks, and artificial intelligence, that can be used to optimize the performance of solar inverters. Furthermore, the paper highlights the importance of circuit design and electrical engineering in designing solar inverters, and explains how optimization techniques can be used to improve their performance. The article also covers various types of renewable energy systems, including grid-connected systems, stand-alone systems, and microgrid systems, and explores how solar inverters can be integrated with energy storage systems and battery systems to provide a more stable and reliable power supply. Additionally, the article discusses the role of solar inverters in smart grid systems and provides an overview of power control and switching control. The author uses simulation models to analyze the performance of solar inverters and highlights the importance of power system stability and control for efficient and reliable power supply.

Download or read book Modular Multilevel Converters written by Sixing Du and published by John Wiley & Sons. This book was released on 2018-02-22 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: An invaluable academic reference for the area of high-power converters, covering all the latest developments in the field High-power multilevel converters are well known in industry and academia as one of the preferred choices for efficient power conversion. Over the past decade, several power converters have been developed and commercialized in the form of standard and customized products that power a wide range of industrial applications. Currently, the modular multilevel converter is a fast-growing technology and has received wide acceptance from both industry and academia. Providing adequate technical background for graduate- and undergraduate-level teaching, this book includes a comprehensive analysis of the conventional and advanced modular multilevel converters employed in motor drives, HVDC systems, and power quality improvement. Modular Multilevel Converters: Analysis, Control, and Applications provides an overview of high-power converters, reference frame theory, classical control methods, pulse width modulation schemes, advanced model predictive control methods, modeling of ac drives, advanced drive control schemes, modeling and control of HVDC systems, active and reactive power control, power quality problems, reactive power, harmonics and unbalance compensation, modeling and control of static synchronous compensators (STATCOM) and unified power quality compensators. Furthermore, this book: Explores technical challenges, modeling, and control of various modular multilevel converters in a wide range of applications such as transformer and transformerless motor drives, high voltage direct current transmission systems, and power quality improvement Reflects the latest developments in high-power converters in medium-voltage motor drive systems Offers design guidance with tables, charts graphs, and MATLAB simulations Modular Multilevel Converters: Analysis, Control, and Applications is a valuable reference book for academic researchers, practicing engineers, and other professionals in the field of high power converters. It also serves well as a textbook for graduate-level students.

Download or read book Direct Current Control for Grid Connected Multilevel Inverters written by Markus Schaefer and published by . This book was released on 2018 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: Control schemes for inverters of different topologies and various numbers of voltage levels are of great interest for many standard as well as special applications. This thesis describes a novel, robust and high-dynamic direct current control scheme for multilevel voltage source inverters. lt is highly independent from load parameters and universally applicable. The new control method is examined and validated with real measurements . The aim of the thesis is to establish and prove a new concept of a direct current control algorithm for multilevel inverter topologies for grid connected systems. This application is characterized by unknown grid conditions including failure modes and other distortions, complex inverter topologies and a large variety and complexity of current control algorithms for multilevel inverters. Therefore the complexity of the system needs to be reduced. Additionally , the advantages of multilevel inverters and the dynamic performance and robustness of direct current control techniques shall be combined. Starting from a detailed literature study on inverter topologies and direct as well as indirect current control methods, the thesis includes three chapters containing relevant contributions to the achievement of the objectives. A method reducing the control-complexity of multilevel converters has been developed. The simplification method is based on a transformation that converts any three-phase voltage (or current) into a non-orthogonal coordinate system. This choice minimizes the complexity and effort to determine the location of those discrete voltage space vectors directly surrounding the required reference voltage vector. A further improvement is achieved by scaling all coordinates to integer values. This is advantageous for further calculations on microprocessors or FPGA based control systems. The main contribution of this thesis is a new direct current control method minimizing the disadvantages of existing direct methods. At the same time advantages of other control algorithms shall be applied. The new method is based on a simple mathematical equation, that is, the solution of a scalar product, to always select the one inverter output voltage vector best reducing the actual current error. This results in the designation "Scalar Hysteresis Control - SHC". An advanced seeking algorithm ensures robust current control capability even in case of unknown, unsymmetrical or changing loads, in case of rapid set-point changes or in cases of unknown phase voltages . The new method therefore shows excellent properties in terms of simplicity , robustness, dynamics and independence from the inverter level count and the hardware topology . The properties of the control method are verified by means of simulations and real measurements on two-, three- and five-level inverters over the complete voltage operating range. Finally, all contributions are collected together and assessed with regard to the objectives. From the proposed control method new opportunities for future work, further developments and extensions are evolving for continuing scientific research.

Download or read book Energy Capture Improvement of a Solar PV System Using a Multilevel Inverter written by Nayeem Mahmud and published by . This book was released on 2011 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The challenges with solar energy extraction are addressed in the proposed approach through development and demonstration of multilevel inverter architecture and the associated control algorithms. The proposed multilevel inverter topology along with the control algorithms for solar photovoltaic (PV) systems increase the overall energy capture from the sun. Multilevel inverters are mostly used in medium and high power applications because of their robustness and reliability. It offers higher efficiency and operates at low frequency. Numerous multilevel inverter topologies have been introduced over the years. In this proposed approach, cascaded multilevel inverter topology has been used. The proposed system suggests how to achieve maximum power point tracking (MPPT) from individual panels rather than from a centralized structure. A centralized controller coordinates the power flow from the individual cells which then feeds into a multilevel inverter to achieve overall MPPT and to deliver compatible AC energy to the utility system. The resulting output AC voltage of the inverter swings with nine levels and forms a staircase waveform which is nearly sinusoidal. To interface the inverter with the grid, a zero crossing detector is used. A 9-level inverter with a total capacity of 800 watts was successfully implemented and tested. A new current control algorithm was developed for the proposed multilevel inverter. The simulation and experimental results show that the current drawn from the individual PV arrays using the developed algorithm are very close to the commanded inputs so that the arrays can operate at their MPPT points. The overall system minimizes the shading effect and improves the per panel efficiency as well as increase the overall energy harvest.

Download or read book Control of Power Inverters in Renewable Energy and Smart Grid Integration written by Qing-Chang Zhong and published by John Wiley & Sons. This book was released on 2012-11-16 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: Integrating renewable energy and other distributed energy sources into smart grids, often via power inverters, is arguably the largest “new frontier” for smart grid advancements. Inverters should be controlled properly so that their integration does not jeopardize the stability and performance of power systems and a solid technical backbone is formed to facilitate other functions and services of smart grids. This unique reference offers systematic treatment of important control problems in power inverters, and different general converter theories. Starting at a basic level, it presents conventional power conversion methodologies and then ‘non-conventional’ methods, with a highly accessible summary of the latest developments in power inverters as well as insight into the grid connection of renewable power. Consisting of four parts – Power Quality Control, Neutral Line Provision, Power Flow Control, and Synchronisation – this book fully demonstrates the integration of control and power electronics. Key features include: the fundamentals of power processing and hardware design innovative control strategies to systematically treat the control of power inverters extensive experimental results for most of the control strategies presented the pioneering work on “synchronverters” which has gained IET Highly Commended Innovation Award Engineers working on inverter design and those at power system utilities can learn how advanced control strategies could improve system performance and work in practice. The book is a useful reference for researchers who are interested in the area of control engineering, power electronics, renewable energy and distributed generation, smart grids, flexible AC transmission systems, and power systems for more-electric aircraft and all-electric ships. This is also a handy text for graduate students and university professors in the areas of electrical power engineering, advanced control engineering, power electronics, renewable energy and smart grid integration.

Download or read book Modelling and Control of Power Inverters in Microgrids written by Xiaotian Zhang and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Power electronic converter systems play an important role in the interconnection of renewable energy sources in microgrids and utility grid. The interface between energy sources and microgrids is usually implemented by digitally controlled power inverters. This thesis provides a discrete modelling and design method for the digitally controlled inverters in microgrids. The fundamentals and background of digital control of power inverters are introduced. The small-signal models for digital pulse-width-modulations (PWMs) with delay effects are derived. Based on the models, the controllers can be designed using several methods according to the block diagrams. The simulation software and experimental environment for the digitally controlled inverters are described. For inverters operating in parallel, a linear voltage control scheme with duty-ratio feedforward is proposed. The control parameters are chosen according to the stable operating condition derived in z-domain. The closed-loop transfer function and output impedance for both the classical controller and the proposed controller are derived theoretically. A comparison reveals the advantages of the proposed control scheme: a unity closed-loop gain, no phase shift, good current sharing and low total harmonic distortion (THD) of the output voltage. The theoretical results are verified by the experimental setup of a system with two digitally controlled inverters connected in parallel. For digitally controlled grid-connected inverters with LCL filters, new small-signal z-domain models are deduced. The proposed methods model the inverters including different delay effects under most possible circumstances, which allows a direct design for controllers in z-domain. The stability boundaries obtained from the root loci of the classic models and the proposed models are compared to the simulation results, showing that the proposed z-domain models are more accurate in predicting instabilities. Experimental results are presented, showing the proposed models are also capable of predicting the values of control variables at the true sampling instants. The phase-shifted modulated multisampled multilevel inverter is studied. The filter current ripple frequency of the multilevel inverters is increased by the phase-shifted PWM. The small-signal z-domain model is derived. Compared to the bipolar switched inverter, the multisampled multilevel inverter is characterized by the capability of achieving higher feedback control gains, which improves the control performance. An experimental prototype based on a 10 kHz switching frequency, 80 kHz sampling frequency five-level single-phase H bridge inverter is tested to demonstrate the validity of the analysis.

Download or read book Proceedings of the 7th International Conference on Electrical Control and Computer Engineering Volume 2 written by Zainah Md. Zain and published by Springer Nature. This book was released on with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Control of Multilevel Power Converters for Weak Grid Applications written by Samuel Jupin and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the progressive rise of the micro-grids incorporating renewable energy sources, a new electricity distribution paradigm is emerging. These new architectures interface uncontrolled consumers with intermittent energy sources, therefore imposing more stress on the conversion, storage and management of the energy.Power converters are adapting accordingly, in particular, with the development of multi-level converters, which allow higher power rates and better power quality than their predecessors with similar components, but whose control is becoming increasingly complex.Due to their hybrid nature, the control of power converters is traditionally split into two parts: on the one side, the continuous objectives related to the main interfacing function of the power converters, and, on the other side, the driving of their quantized power switches, known as the modulation strategy.In this context, the growing demands in efficiency, reliability, versatility and performance require a high level of intelligence of the complete control structure. To meet these requirements, the objectives of this research work are to address both the interfacing objectives and the inner driving of the converter into a single controller. This decision implies incorporating the non-linearity of power converters into the controller, equivalent to suppressing the traditional modulation block. Modulation is the traditional solution to linearize the inner operation of the converters. The Model Predictive Control (MPC) approach was chosen to handle the non-linearity and the diversity of control objectives that accompany power converters.The developed control algorithm combines graph theory, with Dijkstra, A* and other algorithms, with a special state-space model designed for switching systems to form a powerful universal tool capable of simultaneously manipulating the discrete and continuous nature of the converter and its environment. Switched state-space models are studied, leading to interesting results on stability and controllability concerning their application on power converters.The obtained controller is then tested in simulation, with various case studies: grid-connected and standalone inverter, rectifier and bidirectional operation. These situations are studied for three common multi-level topologies: Neutral Point-Clamped, Flying Capacitor and Cascaded H-Bridge. The exact same MPC structure is used for each and every one of the case studies, with adaptations of its internal behavior. This behavior is agglomerated in two functions: the prediction, containing the model of the converter, and the cost function, which translates the control requirements into the optimal problem solved by the algorithm. Changing the topology implies adjusting the model, without impacting the cost function, while modifying this function is sufficient to adapt to the different applications.The results show that the controller manages to directly drive the power switches according to the application, demonstrating a large variety of considerations and objectives. The overall performance of this unique structure is comparable to that of the multiple structures used for each of the studied cases, with the notable exception of rectifier operation mode, where the speed and range of possibilities are particularly interesting.In conclusion, the developed controller manages miscellaneous applications, topologies, objectives and constraints. While the traditional linear control structures have to change, often deeply, for different operation modes and control requirements, such modifications do not affect the control architecture of the designed MPC controller. This shows the versatility of the proposed solution and its universality, further demonstrated by its ability to adapt to different power converters without modifications. Finally, the complexity of the modulation is fully included in the structure, offering simplicity and flexibility to the control design.

Download or read book Advanced DC AC Inverters written by Fang Lin Luo and published by CRC Press. This book was released on 2017-07-28 with total page 325 pages. Available in PDF, EPUB and Kindle. Book excerpt: DC/AC inversion technology is of vital importance for industrial applications, including electrical vehicles and renewable energy systems, which require a large number of inverters. In recent years, inversion technology has developed rapidly, with new topologies improving the power factor and increasing power efficiency. Proposing many novel approaches, Advanced DC/AC Inverters: Applications in Renewable Energy describes advanced DC/AC inverters that can be used for renewable energy systems. The book introduces more than 100 topologies of advanced inverters originally developed by the authors, including more than 50 new circuits. It also discusses recently published cutting-edge topologies. Novel PWM and Multilevel Inverters The book first covers traditional pulse-width-modulation (PWM) inverters before moving on to new quasi-impedance source inverters and soft-switching PWM inverters. It then examines multilevel DC/AC inverters, which have overcome the drawbacks of PWM inverters and provide greater scope for industrial applications. The authors propose four novel multilevel inverters: laddered multilevel inverters, super-lift modulated inverters, switched-capacitor inverters, and switched-inductor inverters. With simple structures and fewer components, these inverters are well suited for renewable energy systems. Get the Best Switching Angles for Any Multilevel Inverter A key topic for multilevel inverters is the need to manage the switching angles to obtain the lowest total harmonic distortion (THD). The authors outline four methods for finding the best switching angles and use simulation waveforms to verify the design. The optimum switching angles for multilevel DC/AC inverters are also listed in tables for quick reference. Application Examples of DC/AC Inverters in Renewable Energy Systems Highlighting the importance of inverters in improving energy saving and power-supply quality, the final chapter of the book supplies design examples for applications in wind turbine and solar panel energy systems. Written by pioneers in advanced conversion and inversion technology, this book guides readers in designing more effective DC/AC inverters for use in renewable energy systems.