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首页> 外文会议>Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition >Operation modes analysis and limitation for diode-assisted buck-boost voltage source inverter with small voltage vector
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Operation modes analysis and limitation for diode-assisted buck-boost voltage source inverter with small voltage vector

机译：电压矢量小的二极管辅助降压-升压型电压源逆变器的工作模式分析及局限性

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摘要

Diode-assisted buck-boost voltage source inverter (VSI) boosts the dc source voltage by introducing a diode-assisted capacitor network. The new topology extends voltage regulation range and avoids extreme duty ratio of switching devices in front boost circuit. As for the unique structure, various pulse-width modulation (PWM) strategies are provided to obtain the maximum linear voltage gain with regard to the chopped intermediate dc-link voltage of the inverter bridge in one switching time period. However, when the inverter supplies inductive or capacitive load with small load power factor, the uni-directional current flow of diode may limit the application of the converter utilizing small voltage vectors for ac output voltage extension. This new operation condition is not expected and has not been discussed before. This paper makes a detailed circuit analysis of the relationship between the undesired operation condition and load power factor. All the theoretical findings are finally verified by simulations and experiments.
机译：二极管辅助的降压-升压电压源逆变器（VSI）通过引入二极管辅助的电容器网络来提高直流源电压。新拓扑拓宽了电压调节范围，并避免了前升压电路中开关器件的极端占空比。对于独特的结构，提供了各种脉宽调制（PWM）策略，以在一个开关时间段内获得相对于逆变器桥的斩波中间dc链路电压的最大线性电压增益。但是，当逆变器向电感性或电容性负载提供较小的负载功率因数时，二极管的单向电流可能会限制转换器的应用，该转换器使用小的电压矢量来扩展交流输出电压。这种新的操作条件是意料之外的，以前没有讨论过。本文详细分析了不良工作条件与负载功率因数之间的关系。所有的理论发现最终通过仿真和实验得到验证。

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