不对称PWM调制在无线电能传输系统的应用研究

发布时间：2018-06-24 18:25

本文选题：无线电能传输系统 + H桥谐振变换器　；参考：《上海交通大学》2014年硕士论文

【摘要】：无线电能传输(Contactless Inductive Power Transfer,CIPT)技术属于智能电网的应用范畴,该技术能够实现用电设备与供电线路之间在无需物理接触的情况下进行能量传输,从而避免了传统电能传输方式引起火花、机械磨损严重等缺点。无线电能传输技术在医疗领域、水下环境以及易燃易爆场所等特殊环境下有着更为广阔的发展空间。所以,对于无线电能传输技术的研究具有重要的科学意义及实用价值。本文研究的主要内容有:1.首先对CIPT技术的主要应用领域进行了调研,介绍了CIPT技术的研究现状和其应用的前景。同时,对CIPT研究领域的关键技术和主要研究方向进行了分析,最后探讨了CIPT技术在今后的发展上可能面临的问题。2.本文分析了CIPT系统各个组成部分的结构,在不改变原有谐振功率变换器拓扑结构的基础上,提出了H桥谐振变换器广义调制控制策略。其后,对基于H桥谐振变换器广义调制的CIPT功率流控制方法进行了研究,分析zvs软开关的相角裕度,提出了不对称pwm调制的研究,建立等效电路模型,实现zvs软开关的优势,为分析和优化设计电压型cipt系统奠定了理论基础。3.由于电压型cipt系统原副线圈之间的磁场耦合系数低、负载吸收的有功功率低,这会导致无线电能传输系统的工作效率不高。本文通过分析,对原、副边串联谐振的电压型cipt系统进行研究,在不改变原有谐振功率变换器结构的基础上,结合系统等效电路建立了稳态解析模型,对h桥逆变器应用了不对称pwm控制策略方案,同时推导出了系统耦合功率与控制角α的函数关系式,进一步以开关管zvs的开关状态为约束条件,其优点是:增大的逆变器zvs开关的相角裕值,降低了逆变器的开关损耗,提高装置在cipt系统的安全性及可靠性。仿真验证了理论分析的结果,为电压型cipt系统的设计与分析提供了一定的理论参考。4.通过理论分析和反复的实验测试,深入研究和揭示了控制方法对功率变换和对cipt系统工作特性的影响,主要包括:功率变换时引起的平滑控制功率流、抑制系统冲击、降低功率器件工作应力、降低功率变换过程中电磁干扰等。针对这些问题,在不改变原有谐振功率变换器结构的基础上,对h桥谐振变换器提出新的调制驱动控制方案,以此来约束及优化功率流,提高装置在无线传输电能时的安全性及可靠性。5.为了验证不对称pwm调制的有效性,运用matlab/simulink对cipt系统进行了仿真并搭建电路进行实验分析。设计系统开关频率为20khz,直流母线电压为50V,模拟负载为10Ω时,观察逆变器电压电流输出的情况。根据实验平台的实际运行结果,可以得到如下的结论:本文研究的无线电能传输系统,总体设计方案可行、理论分析和参数设计正确、控制方法有效、系统工作稳定可靠。该实验平台能够为今后CIPT技术的深入研究奠定坚实的理论基础。
[Abstract]:Contactless Power transfer (CIPT) technology is one of the applications of the smart grid, which enables the transmission of energy between power devices and power lines without physical contact. Thus avoiding the traditional power transmission mode caused by spark, mechanical wear and other shortcomings. Radio energy transmission technology has a wider development space in medical field, underwater environment and flammable and explosive environment. Therefore, the research of radio energy transmission technology has important scientific significance and practical value. The main content of this paper is: 1. Firstly, the main application fields of CIPT technology are investigated, and the research status and application prospect of CIPT technology are introduced. At the same time, the key technologies and main research directions in the field of CIPT are analyzed. Finally, the problems that CIPT may face in the future are discussed. In this paper, the structure of each component of CIPT system is analyzed, and the generalized modulation control strategy of H-bridge resonant converter is proposed without changing the topology of the original resonant power converter. Then, the power flow control method based on generalized modulation of H-bridge resonant converter is studied, the phase angle margin of zvs soft switch is analyzed, the asymmetric pwm modulation is studied, and the equivalent circuit model is established to realize the advantage of zvs soft switch. It lays a theoretical foundation for the analysis and optimization design of voltage-type cipt system. Because of the low coupling coefficient of the magnetic field between the primary and secondary coils and the low active power absorbed by the load in the voltage-type cipt system, the efficiency of the radio energy transmission system will not be high. In this paper, the voltage source cipt system with primary and secondary side series resonance is studied. On the basis of not changing the original resonant power converter structure, the steady-state analytical model is established with the equivalent circuit of the system. The asymmetric pwm control strategy is applied to h bridge inverter, and the function relationship between the coupling power and the control angle 伪 is deduced. Furthermore, the switching state of the switch tube zvs is taken as the constraint condition. It has the advantages of increasing the phase angle margin of the zvs switch of the inverter, reducing the switching loss of the inverter, and improving the safety and reliability of the device in the cipt system. Simulation verifies the results of theoretical analysis and provides a theoretical reference for the design and analysis of voltage-source cipt system. Through theoretical analysis and repeated experimental tests, the effects of control methods on power conversion and cipt system performance are deeply studied and revealed, including: smooth control power flow caused by power conversion and suppression of system impact. Reduce the working stress of power device and reduce the electromagnetic interference in the process of power conversion. To solve these problems, a new modulation drive control scheme is proposed for h bridge resonant converter without changing the original resonant power converter structure, so as to constrain and optimize the power flow. Improve the device in wireless transmission of electrical energy security and reliability. 5. In order to verify the validity of asymmetric pwm modulation, the cipt system is simulated by matlab/simulink and the circuit is analyzed experimentally. When the switching frequency of the system is 20 kHz, the DC bus voltage is 50 V and the analog load is 10 惟, the output of the inverter voltage and current is observed. According to the actual operating results of the experimental platform, the following conclusions can be obtained: the overall design scheme of the radio energy transmission system studied in this paper is feasible, the theoretical analysis and parameter design are correct, the control method is effective, and the system works stably and reliably. The experimental platform can lay a solid theoretical foundation for the further study of CIPT technology in the future.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM724

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