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摘要为了克服传统的AC/AC交流调压器的缺点，本文分析研究了一种单相四开关Z源AC/AC变换器。这种变换器是从直接型交流变换装置中演变而来的，它拥有一个特别的对称型阻抗网络，结构相对来说比较简单、控制起来也比较方便，在需要电压调节的各方面都可以发挥巨大作用。这种Z源变换器输出电压的范围很大，既可以降压也可以升压，且输出相位还可以改变，在文中我们将一一介绍。同时LC网络降低了冲击电流，减少了高次谐波的含量，克服电压型和电流型PWM交流斩波器的一些固有缺陷，提高了可靠性。23340
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由于传统的换流方案不能满足上述变换器的要求，所以本文分析研究了一种全新的方案，它不需要吸收电路就可实现主电路安全换流。基于单相四开关Z源交流变换器拓扑结构的多样性，我们把电压型作为分析对象。最后用仿真软件对其进行仿真，将得到的结果与理论值作比较，验证它的正确性。
关键词 Z源，AC/AC变换器，换流，LC网络，PWM
毕业设计说明书（毕业论文）外文摘要
Title Analysis and Simulation of Z-source AC /AC converter
Abstract
In order to overcome the shortcomings of traditional AC / AC AC regulator In this paper, an analysis of single-phase four-switch Z-source AC / AC converter. AC / AC conversion may be achieved by a variety of structures, there are cascade-type AC / DC / AC conversion type, direct conversion type and a matrix-like high-frequency communication link. Only require some adjustment of the voltage amplitude, the circuit topology is generally a simple direct-type AC / AC converter. Such circuits are mainly Buck, Boost circuit. The main disadvantage of this type of circuit characteristics of a single boost or buck, input and output reverse, complex structures, etc.
For conventional thyristor-controlled phase AC / AC regulator shortcomings, this presents a single-phase four-switch Z-source AC / AC converter. Such converters are based on direct AC conversion device X-type LC network, providing a unique impedance network. It is this simple structure, easy to control, and the need for voltage regulation can be applied in all aspects of. Z-source inverter adjustment range is very wide, you can achieve and reverse output voltage buck. LC network while reducing the impact of current and harmonics to overcome some of the inherent flaws voltage-and current-mode PWM AC chopper, improved reliability.
We will propose a four-switch for single-phase Z-source AC / AC converter commutation scheme, no external snubber circuit can achieve the safety switch commutation. In voltage-switching single-phase Z-source AC / AC converter, for example, its theoretical analysis, design and simulation parameters. The experimental results obtained by the simulation to demonstrate the characteristics and feasibility of Z-source inverter commutation scheme.
Keywords Z source，AC / AC converter，Commutation，LC network，PWM
目录
1 绪论 1
1.1 交-交型AC/AC变换技术 1
1.2 传统变换器 2
1.3 IGBT及PWM控制技术 4
1.4 研究现状 5
1.5 主要研究内容 6
2 Z源AC/AC变换器 7
2.1 电路拓扑族 7
2.2 稳态原理分析 7
2.3 控制原理 14
3 单相四开关Z源交流变换器 16
3.1 换流方案 18
3.2 控制电路 21
3.3 仿真结果 26
结论 32
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