三相全波升压式变换电路的换流原理及特性分析

A Study on Principle and Characteristics of the Commutation for Three-phase Full-wave Boost Converters

三相全波升压式电路是改进型C dump变换器的核心电路 ,其换流过程产生的输出电压脉动 ,是基于该变换器的无刷直流发电系统产生低频纹波的主要原因。分析了三相全波升压式变换电路的换流原理 ,给出了换流过程的等效电路和数学模型 ,讨论了换流过程对输出电压脉动影响的机理 ,并提出了减小电压脉动的措施 ,最后给出了数字仿真与实验结果。所介绍的功率变换器换流原理、换流特性的分析方法及有关结论对其他类型无刷直流发电机和变换器换流特性的分析也有重要参考价值。

The voltage fluctuation is an important index for a DC power system. In the brushless DC power system based on a new C dump bi directional converter,the voltage fluctuation is result from the commutation of the converter.The commutation characteristics and their influences on the voltage fluctuation are investigated in this paper,and some measures are proposed which can be used to reduce the voltage fluctuation.Simulation and experimental results have been given to confirm the influences of the commutation on the voltage fluctuation.