[PDF] Design And Analysis Of A Parallel Resonant Converter For Standby Power System Applications eBook

Author : Vijayakumar Belaguli
Publisher :
Page : pages
File Size : 23,31 MB
Release : 1995
Category :
ISBN :

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High performance ac-to-dc converters are required to meet the regulation standards to suit wide variety of applications. This thesis presents the steady state analysis, design and operation of high frequency (HF) transformer isolated resonant converters on the single phase utility line as a low harmonic controlled rectifier. Two resonant converter configurations of third order have been studied namely the LCC-type parallel resonant converter also popularly known as series-parallel resonant converter (SPRC) and the hybrid parallel-series resonant converter bridge (HPSRCB). These converters are operated at HF using variable frequency as well as fixed frequency control and they operate in different modes depending on the choice of switching frequency and load. The variable frequency SPRC is operated in discontinuous current mode (DCM), to obtain low line current total harmonic distortion (T.H.D.) and high power factor (pf), without using active control. State space analysis has been presented for one of the predominant circuit modes encountered during its operation in DCM. The various design constraints for operating the resonant converter on the utility line for high pf operation have been stated for different control schemes. In addition, steady state analysis, design optimization carried out for dc-dc converter have been presented. The effect of resonant capacitor ratio on the converter performance characteristics have been studied. SPICE3 simulations and experimental results obtained from a 150 W converter are presented to verify the theory. Continuous current mode (CCM) operation of the SPRC, and its effect on the line current T.H.D. and pf are studied. Both fixed and variable frequency control schemes have been used to control the SPRC. Complex ac circuit analysis method has been considered as the design tool to get the design curves and design of the SPRC operating on the utility line. SPICE3 simulation results for open loop operation and experimental results for both open as well as closed loop operations (active control), for two capacitance ratio's have been presented to verify the converter performance. It is shown that nearly sinusoidal line current operation at unity pf can be obtained with closed loop operation. A HPSRCB has been proposed and operated at very high pf on the utility line as a controlled rectifier. Some of the predominant operating modes of the fixed and variable frequency HPSRCB have been identified. The steady state analysis using state space modeling presented for a dc-to-dc converter has been extended to analyze the ac-to-dc converter. Using the large signal discrete time domain model, the time variation of line current and line pf have been predicted using PROMATLAB for both fixed and variable frequency operations of HPSRCB on the utility line. SPICE3 simulation results without active control and experimental results obtained from the bread board model for both open as well as closed loop fixed and variable frequency operations have been presented to verify the theory and design performance.

Author : Marian K. Kazimierczuk
Publisher : John Wiley & Sons
Page : 632 pages
File Size : 47,27 MB
Release : 2012-11-07
Category : Religion
ISBN : 1118585860

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This book is devoted to resonant energy conversion in power electronics. It is a practical, systematic guide to the analysis and design of various dc-dc resonant inverters, high-frequency rectifiers, and dc-dc resonant converters that are building blocks of many of today's high-frequency energy processors. Designed to function as both a superior senior-to-graduate level textbook for electrical engineering courses and a valuable professional reference for practicing engineers, it provides students and engineers with a solid grasp of existing high-frequency technology, while acquainting them with a number of easy-to-use tools for the analysis and design of resonant power circuits. Resonant power conversion technology is now a very hot area and in the center of the renewable energy and energy harvesting technologies.

Author : Venkata Ratnam Vakacharla
Publisher :
Page : 0 pages
File Size : 41,45 MB
Release : 2020
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ISBN :

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Transportation electrification and distributed generation are proven effective strategies to counter climate change. Modern generation and transportation aim to bring down the carbon footprint by transforming the fossil fuel-driven society with alternate energy sources and electric propulsion, respectively. However, harnessing energy from renewable sources is not straight forward but demands a suitable power electronic interface. Similarly, electric transportation propulsion system demands for specific power conversion stages. These power electronic conversion systems include dc-dc converter and dc-ac inverter. Cost, efficiency, power density, and weight are the major requirements of these converters. To obtain these merits, high-frequency soft-switching converters are selected and designed. Resonant converters with a suitable resonance have been usually explored for voltage-fed switching converters to obtain soft-switching of the semiconductor devices at high-frequency. However, owing to the high voltage gain requirements of the solar/fuel cells/batteries, this thesis explores current-fed topologies with different resonant circuits with natural voltage gain. In traditional voltage-fed resonant converters, it is observed that the converter characteristics can be fine-tuned to design the requirements by proper selection of resonant tank. In addition, the resonant tank can integrate the transformer non-idealities and circuit/device parasitic in circuit operation thereby suppressing the consequent voltage spikes across the semiconductor devices. Since voltage-fed converters is fundamentally not suitable for high voltage gain and low voltage applications, this thesis attempts to improve current-fed dc/dc converter characteristics with resonant tanks. In this thesis, a current-fed load resonant DC/DC converter topology is proposed whose characteristics are tuneable with the adopted resonant tank. Further, this thesis proposes a simple technique to ease and improve accuracy of the Fundamental Harmonic Analysis (FHA), which would have been complex otherwise due to capacitive termination of proposed converter. Initially, the characteristics of the proposed converter topology with a parallel resonance derived LCC-T resonant tank is studied to implement zero voltage switching (ZVS) and zero current switching (ZCS) of the semiconductor devices. Three-phase topology of the same has been investigated and analysed. Following the study and a need to further improve the characteristics of resonant dc/dc converter, a series resonance based LCL resonant converter, a dual of the parallel resonance tank is studied and analysed. The load resonant converters are redeemed for integration of PV/fuel cells. Further, for high power applications, suitability of load resonant converters is verified by adopting resonant tank in three-phase topology. Proof-of-concept hardware prototypes are designed and developed in the laboratory to demonstrate the performance and the merits of the proposed soft-switching resonant converter topologies as well as to prove the proposed theory and the claims.