全波升压式C-dump变换器发电运行时两种工作模式的分析与比较

摘要

为使无刷直流电机减小体积、减轻重量、降低成本，选择了电容储能型(C-dump)变换器作为飞机起动/发电系统主电路，考虑发电运行的性能要求对变换器拓扑作了改进。改进得到的全波升压式C-dump变换器可作为双向功率流变换器，应用于无刷直流电机起动/发电系统，具有重要的实用价值。全波升压式C-dump变换器rn由两级功率变换电路构成，发电运行时有两种工作模式：单级工作模式和两级工作模式。本文分析了C-dump变换器发电运行的原理和特性，介绍了这两种工作模式的原理和特性，详细分析了两种工作模式的输出电压纹波、主开关管占空比、发电效率与电机转速的关系，最后进行了仿真分析与比较。%Considering the trend of reducing the volume, weight and cost of brushless DC motors, Cdump topology is used as the power stage of airplane-starter/generator system, with some improvements on the topology to achieve better performance in regenerating mode. Operation principles and characteristics of the regenerating mode are analyzed. The basic principles and operating characteristics of two operating modes (separate operating mode and combining operating mode) applied for generative operating mode of full-wave boosting C-dump converter are introduced. The relationship between rotor speed and the voltage ripple, duty ratio of power switch and efficiency of generator is discussed in detail. In conclusion, the simulating analysis and the comparison based on C-dump converter and electric machine of airplane of brushless starter/generator double function mode are made.