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开关磁阻电机功率变换器主电路拓扑的研究 总被引:4,自引:0,他引:4
介绍了开关磁阻电机各种功率变换器的拓扑结构,并且对其基本结构特点和性能做了比较,为设计功率变换器提供了选择依据,各种不同的功率变换器适合不同的工作情况。文章还简单说明了设计功率变换器主要的要求和依据,以及如何选择主开关器件。 相似文献
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开关磁阻电动机系统功率变换器的设计 总被引:1,自引:0,他引:1
主要讨论5.5kW开关磁阻电动机调速系统功率变换器的电路结构设计、主开关器件的选择和器件定额估算,并对主开关器件驱动电路进行设计。通过试验,验证设计依据和选型的正确性。 相似文献
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针对不同开关变换器模型与拓扑结构密切相关,转换困难的问题,依据能量守恒平均原理,建立连续模式下隔离和非隔离buck、boost、buck-boost变换器统一直流和小信号模型,并给出开环传递函数。将变换器中寄生参数及储能电感折算到与输出电容串联的支路中,在考虑寄生参数影响的同时,减小变换器结构上的差异。所建立的模型可以通过拓扑因数的选择,方便的实现不同变换器模型的转换,有利于各种变换器的比较研究。该模型同样适用于含有同步整流结构的情况。仿真分析表明,模型能够准确描述变换器的频域特性,验证了理论推导的有效性。 相似文献
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Multilevel converters-a new breed of power converters 总被引:3,自引:0,他引:3
Jih-Sheng Lai Fang Zheng Peng 《Industry Applications, IEEE Transactions on》1996,32(3):509-517
Multilevel voltage source converters are emerging as a new breed of power converter options for high-power applications. The multilevel voltage source converters typically synthesize the staircase voltage wave from several levels of DC capacitor voltages. One of the major limitations of the multilevel converters is the voltage unbalance between different levels. The techniques to balance the voltage between different levels normally involve voltage clamping or capacitor charge control. There are several ways of implementing voltage balance in multilevel converters. Without considering the traditional magnetic coupled converters, this paper presents three recently developed multilevel voltage source converters: (1) diode-clamp, (2) flying-capacitors, and (3) cascaded-inverters with separate DC sources. The operating principle, features, constraints, and potential applications of these converters are discussed 相似文献
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In this paper, new topologies for quasi-Cuk converter are proposed. The proposed converters with different voltage and current transfer ratio and reduced voltage stress on capacitor can be employed in distributed generation (DG) systems. In this paper, steady-state analysis of two proposed quasi-Cuk converters in continuous conduction mode (CCM) and discontinuous conduction mode (DCM) is presented. Then, besides values designing of used elements, maximum and minimum values of their current and voltage are calculated. Moreover, critical inductances between CCM and DCM for the proposed converters are calculated. Unique features of the proposed converters are different transfer ratio without employing additional elements compared to the conventional Cuk converter. Comparison of the proposed converters with conventional converter in terms of voltage transfer ratio, voltage stress on capacitor, and voltage stress on switch demonstrates advantages of the proposed converters. Finally, experimental results to verify the accuracy of the proposed converters in different operating modes are presented. 相似文献
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Andrei Blinov Roman Kosenko Andrii Chub Dmitri Vinnikov 《International Journal of Circuit Theory and Applications》2019,47(6):884-908
This paper analyses current-fed (current source) isolated dc-dc converters that are proposed for various renewable energy and dc microgrid applications, such as photovoltaic, fuel cell, or energy storage systems. The analysis addresses current-fed (boost) full-bridge converters that achieve clamping and soft switching without dedicated external auxiliary circuits, such as snubbers or clamps. Such converters have certain limitations that can lead to degraded performance and feasibility due to high circulating energy or low silicone utilization at some operating points. The current study reveals these limitations, highlighting advantages and drawbacks of selected snubberless converters at different operating conditions. The relation between the rms input current and the isolation transformer primary current as well as the cumulative rms current of primary semiconductors is used as figure of merit for converter characterization. This approach can be extended and applied to other topology types and used as a universal tool for performance assessment of snubberless converters without auxiliary circuits for particular operating conditions in various systems. 相似文献
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光纤激光供电技术是实现高压电气设备监测传感器节点能量供应的重要手段。激光光伏转换器前端接触金属栅格结构的优化设计对光纤激光供电技术的改进和应用至关重要。提出了用于小尺寸激光光伏转换器金属栅格结构优化设计的数值仿真方法。该仿真模型是基于开源Solcore Python库构建的,可以按3个步骤创建光伏转换器的混合准三维模型。基于砷化镓(GaAs)材料单结光伏转换器的不同层结构,仿真研究了不同照明模式下基础层厚度和金属栅格结构对光电转换效率的影响。结果表明:使用该模型可以对金属栅格结构进行优化设计,获得仿真模块在不同层结构配置和照明模式下的最优光电转换效率。该仿真模型和优化结果可用于指导激光光伏转换器的研制。 相似文献
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传统的UPFC中的潮流控制和有功功率补偿只是在同一线路上的电源和负载之间进行,因而其潮流控制能力和有功功率补偿的额度有限,不能实现不间断供电。为解决这一缺陷,提出了一种双电源备用供电型通用潮流控制器,该系统由4个共用一条直流母线的变换器构成。在介绍了其数学模型并分析了其主要功能后,详细讨论了其控制策略。MATLAB/SIMULINK环境下仿真研究的结果表明:双电源备用供电型通用潮流控制器能有效提高电力系统的供电可靠性,可实现不间断供电,且能够实现有功功率在不同电源和负载之间的相互补偿。 相似文献
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一种新的开关拓扑变换方法及新型多电平交-交变流电路 总被引:1,自引:3,他引:1
该文提出多电平电路可以通过对基本开关单元的延拓的方法导出,并采用该方法导出了几种新型的多电平交流一交流电流电路,其中包括多电平交流斩波电路和多电平矩阵电路。文中详细分析了3电平交流斩波电路和3电平矩阵电路的工作原理,介绍了3电平矩阵电路所采用的控制方法。与传统电路相比,新的3电平电路可利用的电平数增加1倍,输出电压谐波含量得以减小,并且可以采用较低电压等级的功率器件实现高电压、大功率的交流一交流变换。对这两种电路分别进行了仿真和实验,证实了电路的可行性和该文分析的正确性。 相似文献
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电压源换流器开关器件损耗建模 总被引:6,自引:0,他引:6
IGBT在电力电子装置中得到了大量应用,尤其是在高压大功率电压源换流器领域,而电压源换流器损耗分析一直是电力电子领域的一个研究热点。为了能对电压源换流器损耗进行精确分析,提出一种基于波形拟合理论的绝缘栅双极晶体管与二极管的损耗分析模型。建立的损耗模型充分考虑了电压源换流器不同开关里导通电流变化对于二极管反向恢复过程参数及损耗的影响,该模型还考虑了二极管与IGBT器件相互关系,器件电压、电流、结温变化对损耗的影响,特别计入了电流拖尾过程、电路杂散电感参数的影响。搭建了2.5kV输出Boost实验电路对该损耗模型进行验证,实验结果对比证明了该损耗模型的正确性和有效性。提出的损耗模型适用于电压源换流器型直流输电(voltage sourceconverter high voltage direct current,VSC-HVDC)、静止无功补偿器(static synchronous compensator,STATCON)、统一潮流控制器(unified power flow controller,UPFC)等高压大功率应用场合的电压源换流器损耗分析。 相似文献
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文中分别给出基于张驰振荡器原理以及脉宽调制原理的两种电阻-时间变换器电路。分析表明,两种变换器在宽的电阻变化范围内有良好的线性及稳定性,特别适合用于电阻式传感元件的信号处理。 相似文献