两级升压式高增益三相逆变器

Two-stage Boosting Three-phase Inverter with High Voltage Gain

传统Z源逆变器及其衍生拓扑只能通过控制直通时间实现升压,针对这一特点提出了一种两级升压式高增益三相逆变器,即在结构上采取了两级升压设计,在特定调制方式下合理分配非直通时间可以实现升压。分析了电路工作原理,介绍了PWM控制策略,利用仿真软件及试验数据验证了理论分析的准确性,并证明新型拓扑更适用于需要较大DC/AC电压增益的场合。

Traditional Z-source inverter and its derivative topology could only be boosted by controlling its shoot-through time. In view of the above-mentioned characteristic, this paper proposed a two-stage boosting three-phase inverter of high voltage gain, its structure being designed with a two-stage boosting so that its non-shoot-through time might be distributed reasonably in a specific modulation mode to realize boosting. The working principle of the circuit was analyzed, PWM control strategy was introduced, and the correctness of theoretical analysis was verified through simulation software and test data. Furthermore, the new type of topology was proved to be more suitable when a considerable high DC/AC voltage gain was required.