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Author : Guo Xu
Release :
Genre :
Kind : eBook
Book Rating : 569/5 ( reviews)
Book Synopsis Topology Deduction and Control for Dual-Active-Bridge Converters by : Guo Xu
Download or read book Topology Deduction and Control for Dual-Active-Bridge Converters written by Guo Xu. This book was released on . Available in PDF, EPUB and Kindle. Book excerpt:
Author : Hengsi Qin
Release : 2012
Genre : Electric current converters
Kind : eBook
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Book Synopsis Dual Active Bridge Converters in Solid State Transformers by : Hengsi Qin
Download or read book Dual Active Bridge Converters in Solid State Transformers written by Hengsi Qin. This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt: "This dissertation presents a comprehensive study of Dual Active Bridge (DAB) converters for Solid State Transformers (SSTs). The first contribution is to propose an ac-ac DAB converter as a single stage SST. The proposed converter topology consists of two active H-bridges and one high-frequency transformer. Output voltage can be regulated when input voltage changes by phase shift modulation. Power is transferred from the leading bridge to the lagging bridge. It analyzes the steady-state operation and the range of zero-voltage switching. It develops a switch commutation scheme for the ac-ac DAB converters. Simulation and experiment results of a scaled down prototype are provided to verify the theoretical analysis. The second contribution is to develop a full-order continuous-time average model for dc-dc DAB converters. The transformer current in DAB converter is purely ac, making continuous-time modeling difficult. Instead, the proposed approach uses the dc terms and 1st order terms of transformer current and capacitor voltage as state variables. Singular perturbation analysis is performed to find the sufficient conditions to separate the dynamics of transformer current and capacitor voltage. Experimental results confirm that the proposed model predicts the small-signal frequency response more accurately. The third contribution addresses the controller design of a dc-dc DAB converter when driving a single-phase dc-ac inverter. It studies the effect of 120 Hz current generated by the single-phase inverter. The limitation of PI-controller is investigated. Two methods are proposed to reduce the voltage ripple at the output voltage of DAB converter. The first method helps the feedback loop with feedforward from inverter, while the second one adds an additional resonance controller to the feedback loop. Theoretical analysis, simulation and experiment results are provided to verify the effectiveness of the proposed methods"--Abstract, leaf iii.
Author : Jingxin Hu
Release : 2019
Genre :
Kind : eBook
Book Rating : /5 ( reviews)
Book Synopsis Modulation and Dynamic Control of Intelligent Dual-active-bridge Converter Based Substations for Flexible Dc Grids by : Jingxin Hu
Download or read book Modulation and Dynamic Control of Intelligent Dual-active-bridge Converter Based Substations for Flexible Dc Grids written by Jingxin Hu. This book was released on 2019. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John K. George
Release : 2020
Genre :
Kind : eBook
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Book Synopsis Study of a Symmetrical LLC Dual-active Bridge Resonant Converter Topology for Battery Storage Systems by : John K. George
Download or read book Study of a Symmetrical LLC Dual-active Bridge Resonant Converter Topology for Battery Storage Systems written by John K. George. This book was released on 2020. Available in PDF, EPUB and Kindle. Book excerpt: A symmetrical LLC resonant converter topology with a fixed-frequency quasi-triple phase-shift modulation method is proposed for battery-powered electric traction systems with extensions to other battery storage systems. Operation of the converter with these methods yields two unique transfer characteristics and is dependent on the switching frequency. The converter exhibits several desirable features: 1) load-independent buck-boost voltage conversion when operated at the low-impedance resonant frequency, allowing for dc-link voltage regulation, zero-voltage switching across a wide load range, and intrinsic load transient resilience; 2) power flow control when operated outside the low-impedance resonance for integrated battery charging; 3) and simple operational mode selection based on needed functionality with only a single control variable per mode. Derivation of the transfer characteristics for three operation cases using exponential Fourier series coefficients is presented. Pre-design evaluation of the S-LLC converter is presented using these analytical methods and corroborated through simulation. Furthermore, the construction of a rapid-prototyping magnetics design tool developed for high-frequency transformer designs inclusive of leakage inductance, which is leveraged to create the magnetic elements needed for this work. Two 2kW prototypes of the proposed topology are constructed to validate the analysis, with one prototype having a transformer incorporating the series resonant inductance and secondary clamp inductance into the transformer leakage and magnetizing inductance, respectively. A test bench is presented to validate the analysis methods and proposed multi-operational control scheme. Theoretical and experimental results are compared, thus demonstrating the feasibility of the new multi-mode operation scheme of the S-LLC converter topology.
Author : Xinbo Ruan
Release : 2014-06-23
Genre : Technology & Engineering
Kind : eBook
Book Rating : 208/5 ( reviews)
Book Synopsis Soft-Switching PWM Full-Bridge Converters by : Xinbo Ruan
Download or read book Soft-Switching PWM Full-Bridge Converters written by Xinbo Ruan. This book was released on 2014-06-23. Available in PDF, EPUB and Kindle. Book excerpt: Soft-switching PWM full-bridge converters have been widely used in medium-to-high power DC-DC conversions for topological simplicity, easy control and high effi ciency. Early works on soft-switching PWM full-bridge converter by many researchers included various topologies and modulation strategies. However, these works were scattered, and the relationship among these topologies and modulation strategies had not been revealed. This book intends to describe systematically the soft-switching techniques for pulse-width modulation (PWM) full-bridge converters, including the topologies, control and design, and it reveals the relationship among the various topologies and PWM strategies previously proposed by other researchers. The book not only presents theoretical analysis, but also gives many detailed design examples of the converters. Describes the soft-switching techniques for pulse-width modulation (PWM) full-bridge converters systematically Covers topologies, control and design, from the basics, through to applications and development Deliberates the soft-switching PMW control technique rather than the standard PWM control technique Presents detailed theoretical analysis with design examples for various possible variations to the full-bridge topology using the soft-switching technique Soft-Switching PWM Full-Bridge Converters: Topologies, Control, and Design is an essential and valuable reference for graduate students and academics majoring in power electronics and power supply design engineers. Senior undergraduate students majoring in electrical engineering and automation engineering would also fi nd this book useful.
