一种混合型阻抗源逆变器的研究

RESEARCH ON A HYBRID IMPEDANCE SOURCE INVERTER

针对基于传统单级可升压准Z源逆变器研究,提出一种具有特殊阻抗网络结构的TΓ混合型单级可升压准Z源逆变器(TΓ-qZSI),其阻抗网络是由T型、Γ型阻抗网络组合演化而来。所设计的电路可在较小的直通占空比、更大的调制因子下实现高电压增益。此外,耦合电感的匝比设计灵活,输入电流分布良好。分析TΓ-qZSI的工作模式,推导电路内部各能量转换关系及电压增益。最后在实验室搭建1000 W实验样机进行相关测试,验证了所提变换器的有效性和实用性以及理论分析的正确性。

Based on the research of traditional single-stage step-up quasi Z source inverter,this paper proposes a TΓhybrid singlestage step-up quasi Z source inverter(TΓ-qZSI)with a special impedance network structure,which is the combination of T type andΓtype impedance networks.The proposed circuit can achieve high voltage gain with small duty cycle and high modulation index.Besides,the design of turn ratio of coupled inductor is flexible and the input current is well distributed.This paper analyzes the operation modes of TΓ-qZSI and deduces the relationship of energy transformation between every parts of the circuit as well as the voltage gain.Finally,a 1000 W prototype was fabricated in the laboratory to do relative tests which verified the effectiveness and practicability of the proposed inverter as well as the correctness of theoretical analysis.