高功率密度1kVA航空静止变流器

1kVA Aeronautical Static Inverter with High Power Density

对一种采用分布电能变换技术的航空静止变流器进行分析和研究,变流器由两个推挽正激直流变换器和两级级联全桥逆变器组成,此种结构由规格统一的模块构成,功率变换被平均分配到各模块中进行,避免了高压功率器件的使用。通过对工作原理和控制策略的分析证明,此种结构可显著减小输出滤波器的体积重量,同时可以在较低的开关频率下实现很好的输出特性。研制的一款1kVA 400Hz原理样机效率达91.3%,质量仅为1.8kg,验证了此静止变流器具有功率密度高、输出特性好、可靠性高、易于实现等优点。

An aeronautical static inverter based on distribution power conversion technology is analysed and researched. The inverter consists of two push-pull forward converters and one two-stage cascaded inverter. The structure is composed of some unified modules, which distribute the power to each module equally and avoid the use of high voltage power device. By the analysis of the inverter＇s operation princi- ple and control strategy, the structure can decrease the size and weight of output filter significantly, and achieve a good output characteristic with low switching frequency. A prototype of 1 kVA 400 Hz aero- nautical static inverter is with the high efficiency of 91.3% and the light mass of 1.8 kg, and it is proved that the inverter has the merits of high power density, excellent output properties, and high reliability.