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多电平电路在高压大功率领域的拓展受到其复杂电路拓扑的制约,因此近年来不断有新型多电平电路结构被提出。本文在传统多电平逆变器拓扑结构的基础上,提出了一种新型单相七电平电压源逆变器拓扑。新型电路拓扑是在传统的单相全桥五电平箝位二极管电路基础上,增加了两个开关器件,利用10个开关器件以及4个箝位二极管产生了7种不同的电平输出。详细分析了该逆变器的拓扑结构,给出了PWM控制策略。最后通过仿真实验验证了这种拓扑的可行性。该逆变器对传统箝位二极管逆变器在结构上做出了优化。 相似文献
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多电平逆变器在高压大容量电能变换中得到广泛应用,其控制策略和电路拓扑等已成为了研究热点。本文首先对二极管钳位式四电平的拓扑结构和工作原理进行了详细分析,接着讨论了电压移位控制策略,最后对二极管钳位四电平逆变器在MATLAB/Simulink环境下进行仿真,并给出了相应的仿真波形。 相似文献
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提出了一种新型混合非对称多电平逆变器,该逆变器的突出优点是在输出相同电平的条件下,电路所需的开关元器件和其他元器件比传统的多电平逆变器要少的多,简化了电路结构和控制,降低了成本。对逆变器主电路的结构和工作原理进行了详细阐述,并采用消谐波脉宽调制(Subharmonic Pulse Width Modulation,简称SHPWM)进行控制。最后给出了仿真结果,验证了理论分析。 相似文献
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针对不同种类的多电平逆变器在功率损耗和散热方面的性能特征研究不够的问题,对中点钳位逆变器、对称串联多电平逆变器和混合非对称串联多电平逆变器进行了深入的分析,通过对多电平逆变器的工作原理进行研究,建立多电平逆变器工作过程中主要参数的模型关系,对多电平逆变器的总谐波失真、一阶失真系数、功率损耗和散热量等特性进行了详细的分析,最后通过仿真试验,给出了3种典型的多电平逆变器的主要性能特征。 相似文献
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在分析多电平变流器在大功率风电系统中应用的优势基础上,介绍了二极管钳位式多电平、飞跨电容式多电平、级联型多电平、Boost-TL、VIENNA、有源中点钳位式多电平这六种结构在风力发电系统的应用。文章最后对这六种拓扑结构进行了比较和总结。 相似文献
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在分析二极管箝位型多电平逆变器不同的载波PWM控制方法的基础,提出了一种新型的载波PWM方法。为了验证所提出的PWM方法,对二极管箝位型五电平逆变器进行了仿真研究。仿真结果表明,该方法在低调制度下具有良好的谐波特性,同时可以提高调制度,增加直流电压利用率。 相似文献
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由于化石燃料日益枯竭,以及环境日益恶化,光伏产业蓬勃发展起来。文章主要研究了光伏微型逆变器,作为光伏发电系统的核心部件,逆变器的性能决定着光伏发电系统的性能。文章在分析微型器拓扑和控制策略基础上研制一台基于DSP的200W微型逆变器。首先对逆变器原理进行了理论分析,并通过MATLAB静态仿真验证了其可行性,并对其进行动态仿真,测试逆变电路的稳定性。最后,按照设计要求完成逆变器硬件电路及软件编写等工作,并对该逆变系统进行试验。给出了试验波形,各项指标满足设计要求。 相似文献
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Jih-Sheng Lai Junhong Zhang Huijie Yu Kouns H. 《Power Electronics, IEEE Transactions on》2006,21(6):1667-1675
The operating range of a zero-voltage switched inverter is typically constrained by the source and load variation. This paper adopts a variable turns ratio coupled magnetic type soft-switching inverter for a wide-range source and load adaptability. The operating principle and design guideline are described in detail. Design examples have been verified with computer simulation and hardware implementation. Experimental results of a 120-kW hardware prototype are presented to show superiority of the proposed soft-switching inverter design and significant reduction on loss and dv/dt 相似文献
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《Power Electronics, IEEE Transactions on》2006,21(5):1311-1319
Multilevel converters offer high power capability, associated with lower output harmonics and lower commutation losses. Their main disadvantage is their complexity, requiring a great number of power devices and passive components, and a rather complex control circuitry. This work reports a new multilevel inverter topology using an H-bridge output stage with a bidirectional auxiliary switch. The new topology produces a significant reduction in the number of power devices and capacitors required to implement a multilevel output. The new topology is used in the design of a five-level inverter; only five controlled switches, eight diodes, and two capacitors are required to implement the five-level inverter using the proposed topology. The new topology achieves a 37.5% reduction in the number of main power switches required (five in the new against eight in any of the other three configurations) and uses no more diodes or capacitors that the second best topology in the literature, the Asymmetric Cascade configuration. Additionally, the dedicated modulator circuit required for multilevel inverter operation is implemented using a FPGA circuit, reducing overall system cost and complexity. Theoretical predictions are validated using simulation in SPICE, and satisfactory circuit operation is proved with experimental tests performed on a laboratory prototype. 相似文献
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This paper describes a static reactive-power compensator using a soft-switching scheme. The proposed system is composed of a three-phase current-source inverter with an H-type soft-switching module, which consists of two semiconductor switches, two diodes, and an L-C resonant circuit. The operation of the proposed system was analyzed in detail through a theoretical approach and computer simulation with SPICE. A scaled prototype was built and tested for verifying the feasibility of hardware implementation. The proposed system would be suitable for a high-power application with less switching loss 相似文献