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Multiple Input Multiple Output Converters For Future Low Voltage Dc Power Distribution Architectures
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Book Synopsis Multiple-input Multiple-output Converters for Future Low-voltage DC Power Distribution Architectures by : Yajian Tong
Download or read book Multiple-input Multiple-output Converters for Future Low-voltage DC Power Distribution Architectures written by Yajian Tong and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation and Application of High-efficiency Large-step-down Power Conversion Architectures by : Samantha Joellyn Gunter
Download or read book Investigation and Application of High-efficiency Large-step-down Power Conversion Architectures written by Samantha Joellyn Gunter and published by . This book was released on 2016 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we introduce two large-step-down dc-dc converter architectures that are designed to provide zero-voltage switching of the power devices. While the techniques used in these converters can be used in a wide range of applications, the operating voltage and power levels used in this thesis are for data centers, where dc distribution power delivery is expected to see its first deployment. The nominal 380 V bus voltage will need to be converted to 12 V using a high-efficiency dc-dc converter that can deliver several hundred watts of power to each rack to power the servers. The converters are expected to operate efficiently across a wide input voltage range of 260 V to 410 V and down to powers in the tens of watts range. The first converter architecture is based on the concept of an Impedance Control Network (ICN) resonant converter. Using phase-shift control along with a specifically designed impedance network, this converter can maintain resistive loading of the inverters as the input voltage varies. To back down in power, the converter can be efficiently operated using burst (on/off) mode control. To deliver lower power, we introduce an additional control technique using Variable Frequency Multiplier (VFX) inverters and/or rectifiers. The second converter architecture combines the properties of an active bridge converter with multiple stacked inverters, a multi-winding single core transformer, and a reconfigurable rectifier. The stacked inverter topology improves the range of powers over which zero-voltage switching can be achieved. The multi-winding transformer and reconfigurable rectifier further extend the efficient operating range to very low powers by reducing core loss and increasing zero-voltage switching capability. Both proposed architectures are suitable for large-step-down, wide-input voltage, wide-output power applications such as dc-dc converters for dc distribution.
Book Synopsis Multi-terminal High-voltage Converter by : Bo Zhang
Download or read book Multi-terminal High-voltage Converter written by Bo Zhang and published by John Wiley & Sons. This book was released on 2018-11-29 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: An all-in-one guide to high-voltage, multi-terminal converters, this book brings together the state of the art and cutting-edge techniques in the various stages of designing and constructing a high-voltage converter. The book includes 9 chapters, and can be classified into three aspects. First, all existing high-voltage converters are introduced, including the conventional two-level converter, and the multi-level converters, such as the modular multi-level converter (MMC). Second, different kinds of multi-terminal high-voltage converters are presented in detail, including the topology, operation principle, control scheme and simulation verification. Third, some common issues of the proposed multi-terminal high-voltage converters are discussed, and different industrial applications of the proposed multi-terminal high-voltage converters are provided. Systematically proposes, for the first time, the design methodology for high-voltage converters in use of MTDC grids; also applicable to constructing novel power electronics converters, and driving the development of HVDC, which is one of the most important technology areas Presents the latest research on multi-terminal high-voltage converters and its application in MTDC transmission systems and other industrially important applications Offers an overview of existing technology and future trends of the high-voltage converter, with extensive discussion and analysis of different types of high-voltage converters and relevant control techniques (including DC-AC, AC-DC, DC-DC, and AC-AC converters) Provides readers with sufficient context to delve into the more specialized topics covered in the book Featuring a series of novel multi-terminal high-voltage converters proposed and patented by the authors, Multi-terminal High Voltage Converters is written for researchers, engineers, and advanced students specializing in power electronics, power system engineering and electrical engineering.
Book Synopsis Integrated High-Vin Multi-MHz Converters by : Jürgen Wittmann
Download or read book Integrated High-Vin Multi-MHz Converters written by Jürgen Wittmann and published by Springer Nature. This book was released on 2019-09-03 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides readers with guidelines for designing integrated multi-MHz-switching converters for input voltages/system supplies up to 50V or higher. Coverage includes converter theory, converter architectures, circuit design, efficiency, sizing of passives, technology aspects, etc. The author discusses new circuit designs, new architectures and new switching concepts, including dead-time control and soft-switching techniques that overcome current limitations of these converters. The discussion includes technology related issues and helps readers to choose the right technology for fast-switching converters. This book discusses benefits and drawbacks in terms of integration, size and cost, efficiency and complexity, and enables readers to make trade-offs in design, given different converter parameters. Describes a study for increasing switching frequencies up to 30 MHz at input voltages up to 50V or higher in the scaling of the size of switching converter passives; Analyzes various buck converter implementations and shows that a preference due to higher efficiency depends on the operating point, on the available switch technologies, and on the implementation of the high-side supply generation; Describes an efficiency model based on a four-phase model, which enables separation of loss causes and loss locations.
Book Synopsis Multi-terminal High-voltage Converter by : Bo Zhang
Download or read book Multi-terminal High-voltage Converter written by Bo Zhang and published by John Wiley & Sons. This book was released on 2018-10-19 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: An all-in-one guide to high-voltage, multi-terminal converters, this book brings together the state of the art and cutting-edge techniques in the various stages of designing and constructing a high-voltage converter. The book includes 9 chapters, and can be classified into three aspects. First, all existing high-voltage converters are introduced, including the conventional two-level converter, and the multi-level converters, such as the modular multi-level converter (MMC). Second, different kinds of multi-terminal high-voltage converters are presented in detail, including the topology, operation principle, control scheme and simulation verification. Third, some common issues of the proposed multi-terminal high-voltage converters are discussed, and different industrial applications of the proposed multi-terminal high-voltage converters are provided. Systematically proposes, for the first time, the design methodology for high-voltage converters in use of MTDC grids; also applicable to constructing novel power electronics converters, and driving the development of HVDC, which is one of the most important technology areas Presents the latest research on multi-terminal high-voltage converters and its application in MTDC transmission systems and other industrially important applications Offers an overview of existing technology and future trends of the high-voltage converter, with extensive discussion and analysis of different types of high-voltage converters and relevant control techniques (including DC-AC, AC-DC, DC-DC, and AC-AC converters) Provides readers with sufficient context to delve into the more specialized topics covered in the book Featuring a series of novel multi-terminal high-voltage converters proposed and patented by the authors, Multi-terminal High Voltage Converters is written for researchers, engineers, and advanced students specializing in power electronics, power system engineering and electrical engineering.
Book Synopsis Modeling and Design of Multi-port DC/DC Converters by : Zhijun Qian
Download or read book Modeling and Design of Multi-port DC/DC Converters written by Zhijun Qian and published by . This book was released on 2010 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, a new satellite platform power architecture based on paralleled three-port DC/DC converters is proposed to reduce the total satellite power system mass. Moreover, a four-port DC/DC converter is proposed for renewable energy applications where several renewable sources are employed. Compared to the traditional two-port converter, three-port or four-port converters are classified as multi-port converters. Multi-port converters have less component count and less conversion stage than the traditional power processing solution which adopts several independent two-port converters. Due to their advantages multi-port converters recently have attracted much attention in academia, resulting in many topologies for various applications. But all proposed topologies have at least one of the following disadvantages: 1) no bidirectional port; 2) lack of proper isolation; 3) too many active and passive components; 4) no soft-switching. In addition, most existing research focuses on the topology investigation, but lacks study on the multi-port converter's control aspects, which are actually very challenging since it is a multi-input multi-output control system and has so many cross-coupled control loops. A three-port converter is proposed and used for space applications. The topology features bidirectional capability, low component count and soft-switching for all active switches, and has one output port to meet certain isolating requirements. For the system level control strategy, the multi-functional central controller has to achieve maximal power harvesting for the solar panel, the battery charge control for the battery, and output voltage regulation for the dc bus. In order to design these various controllers, a good dynamic model of the control object should be obtained first. Therefore, a modeling procedure based on a traditional state-space averaging method is proposed to characterize the dynamic behavior of such a multi-port converter. The proposed modeling method is clear and easy to follow, and can be extended for other multi-port converters. In order to boost the power level of the multi-port converter system and allow redundancy, the three-port converters are paralleled together. The current sharing control for the multi-port converters has rarely been reported. A so called "dual loop" current sharing control structure is identified to be suitable for the paralleled multi-port converters, since its current loop and the voltage loop can be considered and designed independently, which simplifies the multi-port converter's loop analysis. The design criteria for that dual loop structure are also studied to achieve good current sharing dynamics while guaranteeing the system stability. The renewable energy applications are continuously demanding the low cost solution, so that the renewable energy might have a more competitive dollar per kilowatt figure than the traditional fossil fuel power generation. For this reason, the multi-port converter is a good candidate for such applications due to the low component count and low cost. Especially when several renewable sources are combined to increase the power delivering certainty, the multi-port solution is more beneficial since it can replace more separate converters. A four-port converter is proposed to interface two different renewable sources, such as the wind turbine and the solar panel, one bidirectional battery device, and the galvanically isolated load. The four-port converter is based on the traditional half-bridge topology making it easy for the practicing power electronics engineer to follow the circuit design. Moreover, this topology can be extended into n input ports which allow more input renewable sources. Finally, the work is summarized and concluded, and references are listed.
Book Synopsis Self-Commutating Converters for High Power Applications by : Jos Arrillaga
Download or read book Self-Commutating Converters for High Power Applications written by Jos Arrillaga and published by John Wiley & Sons. This book was released on 2010-01-12 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: For very high voltage or very high current applications, the power industry still relies on thyristor-based Line Commutated Conversion (LCC), which limits the power controllability to two quadrant operation. However, the ratings of self-commutating switches such as the Insulated-Gate Bipolar Transistor (IGBT) and Integrated Gate-Commutated Thyristor (IGCT), are reaching levels that make the technology possible for very high power applications. This unique book reviews the present state and future prospects of self-commutating static power converters for applications requiring either ultra high voltages (over 600 kV) or ultra high currents (in hundreds of kA). It is an important reference for electrical engineers working in the areas of power generation, transmission and distribution, utilities, manufacturing and consulting organizations. All topics in this area are held in this one complete volume. Within these pages, expect to find thorough coverage on: modelling and control of converter dynamics; multi-level Voltage Source Conversion (VSC) and Current Source Conversion (CSC); ultra high-voltage VSC and CSC DC transmission; low voltage high DC current AC-DC conversion; industrial high current applications; power conversion for high energy storage. This text has a host of helpful material that also makes it a useful source of knowledge for final year engineering students specializing in power engineering, and those involved in postgraduate research.
Book Synopsis DC—DC Converters for Future Renewable Energy Systems by : Neeraj Priyadarshi
Download or read book DC—DC Converters for Future Renewable Energy Systems written by Neeraj Priyadarshi and published by Springer Nature. This book was released on 2021-09-27 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book presents the analysis and control of numerous DC-DC converters widely used in several applications such as standalone, grid integration, and motor drives-based renewable energy systems. The book provides extensive simulation and practical analysis of recent and advanced DC-DC power converter topologies. This self-contained book contributes to DC-DC converters design, control techniques, and industrial as well as domestic applications of renewable energy systems. This volume will be useful for undergraduate/postgraduate students, energy planners, designers, system analysis, and system governors.
Book Synopsis Advanced Multiphasing Switched-Capacitor DC-DC Converters by : Nicolas Butzen
Download or read book Advanced Multiphasing Switched-Capacitor DC-DC Converters written by Nicolas Butzen and published by Springer Nature. This book was released on 2020-07-03 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a detailed analysis of switched-capacitor DC-DC converters that are entirely integrated on a single chip and establishes that these converters are mainly limited by the large parasitic coupling, the low capacitor energy density, and the fact that switched-capacitor converter topologies only have a fixed voltage conversion ratio. The authors introduce the concept of Advanced Multiphasing as a way to circumvent these limitations by having multiple out-of-phase parallel converter cores interact with each other to minimize capacitor charging losses, leading to several techniques that demonstrate record efficiency and power-density, and even a fundamentally new type of switched-capacitor topology that has a continuously-scalable conversion ratio. Provides single-source reference to the recently-developed Advanced Multiphasing concept; Enables greatly improved performance and capabilities in fully integrated switched-capacitor converters; Enables readers to design DC-DC converters, where multiple converter cores are put in parallel and actively interact with each other over several phases to improve their capabilities.
Book Synopsis Non-Isolated DC-DC Converters for Renewable Energy Applications by : Frede Blaabjerg
Download or read book Non-Isolated DC-DC Converters for Renewable Energy Applications written by Frede Blaabjerg and published by CRC Press. This book was released on 2021-04-22 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photovoltaic (PV) energy generation is an excellent example of large-scale electric power generation through various parallel arrangements of small voltage-generating solar cells or modules. However, PV generation systems require power electronic converters system to satisfy the need for real-time applications or to balance the demand for power from electric. Therefore, a DC-DC power converter is a vital constituent in the intermediate conversion stage of PV power. This book presents a comprehensive review of various non-isolated DC-DC power converters. Non-isolated DC-DC converters for renewable energy system (RES) application presented in this book 1st edition through a detailed original investigation, obtained numerical/experimental results, and guided the scope to design new families of converters: DC-DC multistage power converter topologies, Multistage "X-Y converter family", Nx IMBC (Nx Interleaved Multilevel Boost Converter), Cockcroft Walton (CW) Voltage Multiplier-Based Multistage/Multilevel Power Converter (CW-VM-MPC) converter topologies, and Z-source and quasi Z-source. Above solutions are discussed to show how they can achieve the maximum voltage conversion gain ratio by adapting the passive/active component within the circuits. For assessment, we have recommended novel power converters through their functionality and designs, tested and verified by numerical software. Further, the hardware prototype implementation is carried out through a flexible digital processor. Both numerical and experimental results always shown as expected close agreement with primary theoretical hypotheses. This book offers guidelines and recommendation for future development with the DC-DC converters for RES applications based on cost-effective, and reliable solutions.
Book Synopsis A Triangular Modular Multilevel DC-DC Converter with Multiple-input Multiple-output Power Flow Capability by : Kia Filsoof
Download or read book A Triangular Modular Multilevel DC-DC Converter with Multiple-input Multiple-output Power Flow Capability written by Kia Filsoof and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been recent interest in expansion of direct-current (dc) networks, motivated mainly by proliferation of renewable energy sources, electrical energy storage, and electronic loads which operate with dc power. One of the key challenges hindering the adoption of dc networks is the lack of high performance dc-dc converter topologies to accommodate energy exchange, at high power levels, between dc buses of different voltage levels. Conventional dc-dc power converters such as the boost or the flyback face a fundamental limitation in operating at high power levels and/or voltage conversion ratios. As these topologies utilize a single semiconductor switch, their maximum attainable power and voltage rating is dependent on the highest power rated semiconductors available. Moreover, regardless of the operating power, these topologies suffer from high losses and ringing when operated at high conversion ratios. In recognizing the shortcomings of conventional topologies for employment in high power and/or conversion ratio applications, a new topology is proposed that provides an efficient and cost-effective solution. The proposed modular topology is constructed from identical converter cells which may be connected in parallel and series to share the overall power stress. As a result, the dependency of the topology's power and conversion ratio on existing semiconductor technology is insignificant. Moreover, the topology is capable of supporting bidirectional power flow exchange between multiple sources and loads which makes it suitable for a wide range of power conversion applications. The proposed topology can achieve a conversion ratio of six with half of its switches operating at a duty cycle value 25% lower and the other half of its switches operating at a duty cycle value 40% lower than that of the conventional boost converter while requiring only 15% higher switch volt-ampere rating. The proposed converter's operating mechanism is described, and its analytical steady-state and dynamic models are derived. In investigating the topology's dynamic model, a modular control algorithm is devised for closed-loop operation of the topology. The ability of the topology to operate as a multiple-input multiple-output converter is also investigated through similar analytical and control studies. Simulation and experimental studies are carried out to evaluate the converter's performance under both steady-state and dynamic operation.
Book Synopsis Advanced Multi-Quadrant Operation DC/DC Converters by : Fang Lin Luo
Download or read book Advanced Multi-Quadrant Operation DC/DC Converters written by Fang Lin Luo and published by CRC Press. This book was released on 2005-10-31 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are several families of DC/DC converters comprising hundreds of different topologies. Sorting through the various properties and characteristics is obviously a daunting task. Culled from the pages of the groundbreaking Advanced DC/DC Converters, this book provides a focused, concise overview of more than 50 topologies of multi-quadrant converters. All aspects of these topologies are illustrated through designs developed by the authors through the years. The book begins with multiple-quadrant converters followed by switched component (SC and SI) converters, multiple-lift push-pull switched-capacitor converters, and finally, multiple-quadrant soft-switching converters.
Book Synopsis Single-inductor Multiple-output Power Converters by : Yi Zhang
Download or read book Single-inductor Multiple-output Power Converters written by Yi Zhang and published by . This book was released on 2013 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: DC-DC power converters are widely used in modern very large-scale integration (VLSI) systems to achieve on-chip voltage conversions, thereby appropriately powering different functional blocks with different supply voltages according to the operation requirements. The single-inductor multiple-output (SIMO) power converters are thus proposed as a cost-effective solution for implementing multiple DC-DC voltage conversions with a single inductor, leading to significantly reduced system form factor and cost of mass productions. Due to the new system architectures and operation schemes, the corresponding design challenges for SIMO power converters start to arise. This dissertation first reviews different types of DC-DC power converters on the respective advantages and disadvantages. The fundamentals of SIMO power converters are also discussed in terms of power stage topologies, operation modes and performance barriers. The adaptive pseudo-CCM (PCCM) operation is then proposed for SIMO power converters to achieve low inductor current ripples and low cross-regulation effect simultaneously, while maintaining low conduction and switching power loss of the freewheel switch. Two prototypes using digital and analog based controllers are developed to verify the adaptive PCCM operation with distributed and unified freewheel switching schemes. In order to overcome the inherently slow load transient response and potential cross-regulation effect, the paralleled hybrid SIMO power converter with adaptive current compensation (ACC) technique is proposed to achieve nano-second level load transient response with 500kHz switching frequency, while keeping high power efficiency. No measurable cross-regulation effect is observed throughout the entire load range. The SIMO power converters are further tailored to drive light-emitting diodes (LEDs) in backlighting applications. A SIMO parallel-string LED driver with local bus voltage optimization and single time-shared regulation loop is proposed to significantly reduce the headroom power loss and current balance error between different LED strings. A single-adaptive-output LED driver is also developed as an alternative solution for providing multiple supply voltage alternately in time domain with fast output voltage hopping. The SIMO power converter is further extended to a dual-input dual-output unified power management unit (PMU) for simultaneous solar harvesting and LED driving. The maximum power point tracking (MPPT) and LED current regulation are constantly guaranteed regardless of the environmental or load variation.
Book Synopsis Energy Conversion by : Ibrahim H. Al-Bahadly
Download or read book Energy Conversion written by Ibrahim H. Al-Bahadly and published by BoD – Books on Demand. This book was released on 2019-01-16 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Energy conversion technology has always been a main focus for researchers in order to meet the increasing demand as well as securing a clean, consistent and reliable energy supply. The constantly rising fuel price is another good reason to develop alternative systems such as wind turbines, hydropower, photovoltaic systems and other renewable energy solutions. This book contains a collection of selected research works in the areas of electric energy generation, renewable energy sources, hybrid system, electromechanical energy conversion, electric machines, power electronic converters and inverters, energy storage, smart grid and traditional energy conversion systems. The book intends to provide academic and industry professionals working in the field of energy conversion and related applications with an update in energy conversion technology, particularly from the applied perspective.
Book Synopsis Some References on Cox Spot in Apples by :
Download or read book Some References on Cox Spot in Apples written by and published by . This book was released on 1964 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Current Density Low Voltage Isolated DC-DC Converters with Fast Transient Response by : Liangbin Yao
Download or read book High Current Density Low Voltage Isolated DC-DC Converters with Fast Transient Response written by Liangbin Yao and published by . This book was released on 2007 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the rapid development of microprocessor and semiconductor technology, industry continues to update the requirements for power supplies. For telecommunication and computing system applications, power supplies require increasing current level while the supply voltage keeps decreasing. For example, the Intel's CPU core voltage decreased from 2 volt in 1999 to 1 volt in 2005 while the supply current increased from 20A in 1999 to up to 100A in 2005. As a result, low-voltage high-current high efficiency dc-dc converters with high power-density are demanded for state-of-the-art applications and also the future applications. Half-bridge dc-dc converter with current-doubler rectification is regarded as a good topology that is suitable for high-current low-voltage applications. There are three control schemes for half-bridge dc-dc converters and in order to provide a valid unified analog model for optimal compensator design, the analog state-space modeling and small signal modeling are studied in the dissertation and unified state-space and analog small signal model are derived. In addition, the digital control gains a lot of attentions due to its flexibility and re-programmability. In this dissertation, a unified digital small signal model for half-bridge dc-dc converter with current doubler rectifier is also developed and the digital compensator based on the derived model is implemented and verified by the experiments with the TI DSP chip. In addition, although current doubler rectifier is widely used in industry, the key issue is the current sharing between two inductors. The current imbalance is well studied and solved in non-isolated multi-phase buck converters, yet few discusse this issue in the current doubler rectification topology within academia and industry. This dissertation analyze the current sharing issue in comparison with multi-phase buck and one modified current doubler rectifier topology is proposed to achieve passive current sharing. The performance is evaluated with half bridge dc-dc converter; good current sharing is achieved without additional circuitry. Due to increasing demands for high-efficiency high-power-density low-voltage high current topologies for future applications, the thermal management is challenging. Since the secondary-side conduction loss dominates the overall power loss in low-voltage high-current isolated dc-dc converters, a novel current tripler rectification topology is proposed. Theoretical analysis, comparison and experimental results verify that the proposed rectification technique has good thermal management and well-distributed power dissipation, simplified magnetic design and low copper loss for inductors and transformer. That is due to the fact that the load current is better distributed in three inductors and the rms current in transformer windings is reduced. Another challenge in telecommunication and computing applications is fast transient response of the converter to the increasing slew-rate of load current change. For instance, from Intel's roadmap, it can be observed that the current slew rate of the age regulator has dramatically increased from 25A/uS in 1999 to 400A/us in 2005. One of the solutions to achieve fast transient response is secondary-side control technique to eliminate the delay of optocoupler to increase the system bandwidth. Active-clamp half bridge dc-dc converter with secondary-side control is presented and one industry standard 16th prototype is built and tested; good efficiency and transient response are shown in the experimental section. However, one key issue for implementation of secondary-side control is start-up. A new zero-voltage-switching buck-flyback isolated dc-dc converter with synchronous rectification is proposed, and it is only suitable for start-up circuit for secondary-side controlled converter, but also for house-keeping power supplies and standalone power supplies requiring multi-outputs.
Book Synopsis Two New Families of High-gain Dc-dc Power Electronic Converters for Dc-microgrids by : Venkata Anand Kishore Prabhala
Download or read book Two New Families of High-gain Dc-dc Power Electronic Converters for Dc-microgrids written by Venkata Anand Kishore Prabhala and published by . This book was released on 2014 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Distributing the electric power in dc form is an appealing solution in many applications such as telecommunications, data centers, commercial buildings, and microgrids. A high gain dc-dc power electronic converter can be used to individually link low-voltage elements such as solar panels, fuel cells, and batteries to the dc voltage bus which is usually 400 volts. This way, it is not required to put such elements in a series string to build up their voltages. Consequently, each element can function at it optimal operating point regardless of the other elements in the system. In this dissertation, first a comparative study of dc microgrid architectures and their advantages over their ac counterparts is presented. Voltage level selection of dc distribution systems is discussed from the cost, reliability, efficiency, and safety standpoints. Next, a new family of non-isolated high-voltage-gain dc-dc power electronic converters with unidirectional power flow is introduced. This family of converters benefits from a low voltage stress across its switches. The proposed topologies are versatile as they can be utilized as single-input or double-input power converters. In either case, they draw continuous currents from their sources. Lastly, a bidirectional high-voltage-gain dc-dc power electronic converter is proposed. This converter is comprised of a bidirectional boost converter which feeds a switched-capacitor architecture. The switched-capacitor stage suggested here has several advantages over the existing approaches. For example, it benefits from a higher voltage gain while it uses less number of capacitors. The proposed converters are highly efficient and modular. The operating modes, dc voltage gain, and design procedure for each converter are discussed in details. Hardware prototypes have been developed in the lab. The results obtained from the hardware agree with those of the simulation models."--Abstract, page iv.
