排序方式: 共有128条查询结果,搜索用时 15 毫秒
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建立了谷值V2控制Boost变换器的离散迭代映射模型,在此基础上得到了输入电压、输出电容及其等效串联电阻(equivalent series resistance,ESR)变化时的分岔图,推导了不动点处的雅可比矩阵,利用特征值和最大Lyapunov指数对系统进行了稳定性分析,并验证了分岔图的正确性.重点研究了输入电压和输出电容及其ESR对谷值V2控制Boost变换器的动力学特性的影响.研究结果表明,输入电压增大时,变换器从周期1态经历1次倍周期分岔和边界碰撞分岔进入混沌状态;输出电容及其ESR具有相同的分岔路由,随着输出电容及其ESR的逐渐减小,变换器具有从周期1态经历周期2态、周期4态、周期8态、逐渐演变到混沌态的动力学行为.最后,用仿真和实验结果验证了本文理论分析的正确性. 相似文献
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光伏电池的输出功率取决于外界环境(温度和光照条件)和负载状况,需采用最大功率点跟踪(MPPT)电路,才能使光伏电池始终输出最大功率,从而充分发挥光伏器件的光电转换效能.在比较了常用光伏发电系统控制的优缺点后,依据MPPT控制算法的基本工作原理,主电路采用双并联Boost电路,具有电压提升功能,并且能够提高DC-DC环节的额定功率和减小直流母线电压的纹波.针对传统扰动观察法存在的振荡和误判问题,提出了一种新型的基于双并联Boost电路的改进扰动观察法最大功率跟踪策略.在Matlab/Simulink下进行了建模与仿真,仿真结果表明,当外界环境发生变化时,系统能快速准确跟踪此变化,避免算法误判现象的发生,通过改变当前的负载阻抗,使之与光伏电池的输出阻抗等值相匹配采满足最大功率输出的要求,使系统始终工作在最大功率点处,并且在最大功率点处具有很好的稳态性能.最后通过实验验证了该算法的有效性. 相似文献
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In this paper, the modelling, analysis and the power electronics simulator (PSIM) simulations of the fractional order Buck–Boost converter operating in continuous conduction mode (CCM) operation are investigated. Based on the three-terminal switch device method, the average circuit model of the fractional order Buck–Boost converter is established, and the corresponding DC equivalent circuit model and AC small signal equivalent circuit model are presented. And then, the equilibrium point and the transfer functions are derived. It is found that the equilibrium point is not influenced by the inductor’s or the capacitor’s order, but both these orders are included in the derived transfer functions. Finally, the comparisons between the theoretical analysis and the PSIM simulations are given for confirmation. 相似文献
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Jinn-Chang Wu Hurng-Liahng Jou Pei-Hsuan Huang I-Husan Chiu 《International Journal of Electronics》2013,100(10):1567-1582
The interleaved boost power converter has the advantages of ripple cancellation and better efficiency. The major problem of the interleaved boost power converter is the current balancing among different phases of the boost power converters. In this paper, a current balancing control method for equalizing the currents of two-phase interleaved boost power converter is proposed. The output current can effectively detect the mismatch between the boost power converters for the interleaved boost power converter. The output current is used to perform both the current balance and the current-mode control. The salient feature is that only one current sensor is used in the proposed current balancing control method. A hardware prototype is developed, and the experimental results verify the performance of the proposed current balancing control method is as expected. 相似文献
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传统的Boost APFC在中大功率(≥3 kW)应用时有显著的开关损耗和整流器的反向恢复损耗,而且需要较大的输入电感电容,使得其成本和效率明显降低。针对这些问题采用新型交错式PFC控制后其不仅具有低功耗、低EMI、高效率,而且还可以进一步扩展功率等级范围。文中创新性地运用Synospsys公司强大的数模混合仿真软件Saber对一款大于3 kW的交错式并联PFC系统进行了DC分析、瞬态分析、参数扫描分析以及FFT分析,仿真分析结果验证了交错式并联PFC不仅具有减小输入输出电流纹波、减小电感电容值和提高变换器效率和功率等级等优点,而且有利于缩短开发周期、降低设计成本及便于软件的工程调试。 相似文献
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参数共振微扰法是一种简单的非反馈混沌控制方法,它十分适合非自治系统的混沌控制.研究了这种方法在电流模式控制Boost变换器混沌控制中的应用,并通过对扰动相位进行优化 ,达到最优的混沌控制结果.同时对参数共振微扰法及其优化方法在Boost变换器混沌控制中的作用进行了理论分析,推导并计算了各种电路参数变化对有效的混沌控制所需的扰动的影响.
关键词:
Boost变换器
混沌
混沌控制
参数共振微扰法 相似文献
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有源功率因数校正(Active Power Factor Correction,APFC)技术已在现代电力电子技术中得到广泛使用,其转换器工作在高频开关状态下,并且本身具有小型化,可承受一定范围内输入电压的变化和具有高功率因数等优点。当比例积分PI控制器的输出饱和时会出现失控,导致控制器的性能下降甚至不稳定。针对此现象,加入了抗饱和(Anti-Windup)PI调节器,可以解决输出需要很长时间达到稳定值的问题,提高系统的动态性能。并运用仿真软件MATLAB/Simulink,建立基于抗饱和积分的APFC仿真研究,实现了稳定输出电压400 V。通过对比,表明Anti-Windup PI调节器具有较好的控制性能。 相似文献
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Dong Yun Jung Youngrak Park Hyun Soo Lee Chi Hoon Jun Hyun Gyu Jang Junbo Park Minki Kim Sang Choon Ko Eun Soo Nam 《ETRI Journal》2017,39(1):62-68
In this paper, we present the design and characterization analysis of a cascode GaN field‐effect transistor (FET) for switching power conversion systems. To enable normally‐off operation, a cascode GaN FET employs a low breakdown voltage (BV) enhancement‐mode Si metal‐oxide‐semiconductor FET and a high‐BV depletion‐mode (D‐mode) GaN FET. This paper demonstrates a normally‐on D‐mode GaN FET with high power density and high switching frequency, and presents a theoretical analysis of a hybrid cascode GaN FET design. A TO‐254 packaged FET provides a drain current of 6.04 A at a drain voltage of 2 V, a BV of 520 V at a drain leakage current of 250 μA, and an on‐resistance of 331 mΩ. Finally, a boost converter is used to evaluate the performance of the cascode GaN FET in power conversion applications. 相似文献