## 多电平交流直接变换器的电路拓扑研究

文章主要系统的研究了三电平交流直接变换器的拓扑结构，对比互补控制策略，提出并分析了非互补性控制策略，详细说明了如何运用非互补性控制策略去控制多电平变换器的稳定性，可靠性，本文在最后还对于三电平、多电平技术在交流直接变换器中的应用进行了总结以及展望。33985

Title    Research on circuit topology of multilevel AC converter
Abstract
Currently in the three-level, multilevel AC-AC direct converter circuit in most of the studies is still in the theoretical stage, and for multilevel technology in the application of AC to AC direct converter is still in the frontier of academic research stage. This paper mainly discusses the circuit topology of a multilevel AC direct converter: zeta type multilevel AC direct converter. From the structure of the circuit topology, working principle, control strategy, work characteristics and simulation verification studied the multilevel AC direct converter.
The main system of the zeta type three-level AC direct transformation of topological structure, compared with complementary control strategy is proposed and analyzed the non complementary control strategy, a detailed description of how to use non complementary control strategy to control the stability of the multilevel converters, reliability, this paper also for three level, multilevel technology application in the AC direct converter are summarized and prospected in the end.

Keywords   Multilevel, PWM regulator， AC direct conversion, non complementary control strategy,

1  绪论 1
1.1  引言  1
1.2  多电平技术  1
1.3 交-交变换技术 2
2  变换器的电路拓扑构成方法分析  4
2.1多电平变换器基本构成单元的提出   4
2.2  由基本单元得到的多电平变换器拓扑 4
2.2.1基本单元串一并得到的多电平变换器拓扑 4
2.2.2基本单元并一串得到的多电平变换器拓扑5
3   新型的交-交型三电平交-交直接变换器的电路拓扑分析 8
3.1Buck型三电平交-交直接变换器8
3.2 Boost型AC-AC变换器 12
3.3Buck-boost型AC-AC变换器 13
3.4Cuk型AC-AC变换器 15
3.5Sepic型AC-AC变换器 16
3.6Zeta型AC-AC变换器 18
4  串-并联组合式多电平交-交直接变换器的电路拓扑研究 20
4.1基本电路单元 20
4.2由基本电平得到的多电平变换器拓扑 21
4.3基本单元的串联23
4.3.1串联电路的工作原理和稳态分析23
4.3.2控制电路的设计31
4.3.3电路仿真 36

1    绪论
1.1引言

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