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Research On Analysis And Optimization For Transmission Power And Efficiency Of Inductively Coupled Power Transfer System

Posted on:2011-05-17Degree:DoctorType:Dissertation
Country:ChinaCandidate:C Y XiaFull Text:PDF
GTID:1102330338982743Subject:Control theory and control engineering
Abstract/Summary:PDF Full Text Request
Inductively coupled power transfer (ICPT) technology is a new power transmission technology based on Faraday's electromagnetic induction law, it has solved the problem on how to supply power to mobile devices wirelessly and flexibly. Compared with the traditional power transmission mode, it is more secure, reliable and flexible. In a word, it has an expansive application prospect.Due to the development of current research and application for ICPT technology is not comprehensive and not deep enough, the relevant theory and experimental research is still relatively lacking, especially on the aspect of how to improve the energy-efficiency(transmission power and efficiency) is still imperfect, the energy-efficiency still remains at a relatively low level. Although some literature have carried some analysis on the transmission power and efficiency of ICPT system, most of them are either based on power transmission characteristic of the system, or based on the efficiency characteristic of the system, while no literature has put the transmission power character and efficiency character together, and based on its energy-efficiency character to analyse. Although some design has achieved the power transmission optimmum in some ICPT system, the efficiency of the system is too low; or some system although has achieved the efficiency optimum design, but it does not work in the optimal power state, which seriously affects its power transmission capacity. Therefore, these optimal designs are not complete enough. In the absence of analysing the energy-efficiency character of ICPT system, which made the transmission power and efficiency of the current ICPT system are relatively low, high cost, slow process of industrialization. So, the analysis and optimization for energy-efficiency character of ICPT system is particularly urgent.Because there are too many parameters which can affect the energy-efficiency of ICPT system, and there are strong adhesions existing among these parameters, some selections of parameters are even contradictory, all of these have brought great difficulties to optimize the energy-efficiency character of ICPT system. So, the influence of the selection of the parameters to the energy-efficiency character must be considered, and the parameters must be optimized to achieve high power, high efficiency of energy output for ICPT system.The paper research is supported by the National Natural Science Foundation of the "Efficient and more freedom contactless power transfer system key technologies" (Fund No.: 50777071) and Chongqing Science and Technology research project "Urban rlectric transportation research and development of a new power mode" (Item No: CSTC2008AC3089 ). In order to optimize the energy-efficiency character of ICPT system, using the equivalent coupling model, this project has analysied the energy-effciency character of ICPT system with various work modes and topologies comprehensively and systematically. According to the analysis results, the corresponding energy-efficiency optimization methods were proposed.The main works of the paper include:1. Firstly, the paper has analysed the research status for energy-efficiency character of ICPT system. According to the defects and deficiencies of the current research, the purpose, content and meaning of this paper were proposed.2. Secondly, the various factors which can effect the energy-efficiency chatacter of ICPT system were analysed. And some general guidance methods for the ICPT system design on account of the energy-efficiency character were given.3. Thirdly, the relationship between the mutual inductance and energy-efficiency character of ICPT system with four typical topologies were analyzed, and the mutual inductance was optimized for achieving maximum power transfer for ICPT system. Furthermore, according to the contradiction that the maximum transmission power existence condition of voltage-fed ICPT is substantially at the cost of its efficiency, a novel evaluation index was presented. With this index, the mutual inductance was optimized, and a global optimization design for the energy-efficiency character of ICPT system was realized. Finally, simulation and experiment results verified the analysis and the optimization design method.4. Fourthly, due to the efficiency computing method for ICPT system with different resonant coupling topological structure is skimble-scamble, a general computing method for the efficiency of the ICPT system with different resonant coupling topologies was given through analyzing the ICPT system with four typical resonant coupling topologies. Then, in order to reduce the power loss, the parameters of a current source ICPT system with different design requriments were optimized through mathematical modeling. Finally, experiment result verified the analysis and the optimization design method.5. Then, due to the ICPT system in rail is a distributed system, only part of the primary rail involved in the magnetic coupling, the coupling factor is difficult to calculate, which made the optimization for its energy-efficiency character is difficult. For the ICPT system with this particular magnetic structure, a new method for calculating its energy-efficiency was proposed. In addition, a procedure of optimized design was given according to the need of the power requirement factually. This method has achieved the optimized control for transmission power by optimizing the numbers of the primary and the secondary coils, and increased the efficiency as much as possible at the same time. Finally, this theory was justified via an experiment.6. Finally, For the ICPT system with multi-load, the system can easily detuned and the optimal balance of transmission power and efficiency can easily be destroyed by load switching. For the energy-efficiency optimization of ICPT system with this particular mode, the condition for the ICPT system can always keep working at maximum power or maximum efficiency mode was analyzed when the load changes. In addition, a procedure of optimized design was given according to the need of the power and efficiency requirement factually. This method has achieved the optimized control of transmission power and efficiency by optimizing the input voltage and mutual inductance. Finally, this criterion was justified via an experiment.The innovative contributions of this paper are:1. A general power transmission optimization method for ICPT system was given, and a new comprehensive evaluation index which is applicable to ICPT system was proposed innovatively. With this index, the parameters were optimized, and a global optimization design for the energy-efficiency character of ICPT system was realized.2. Due to the efficiency computing method for ICPT system with different resonant coupling topological structure is skimble-scamble, a general efficiency computing method for the resonant coupling topologies of ICPT system was given, which has simplified the efficiency solution process of ICPT system.3. Due to the ICPT system in rail is a distributed system, the coupling factor is difficult to calculate, which made the optimization for its energy-efficiency is difficult, a new method for calculating the transmission power and efficiency of the ICPT system in rail was proposed.4. For the ICPT system with multi-load, the system can easily detuned and the optimal balance of power or efficiency can easily be destroyed by load switching, an optimized design and control method was proposed, which can keep the system always working at the maximum power or maximum efficiency mode.
Keywords/Search Tags:inductively coupled power transfer(ICPT), transmission power, efficiency, optimization
PDF Full Text Request
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