一种提高开关磁阻发电机输出性能的改进型他励变换器

An Improved Separately Excited Converter for Improving the Performance of Switched Reluctance Generator System

为了提高开关磁阻发电机(SRG)系统的输出性能,该文提出一种用于SRG的改进型他励变换器,以提高其直流发电应用中的输出电压和功率等特性。该变换器前端插入一个辅助电路集成到常规的不对称桥他励变换器中,通过控制辅助电路中的辅助开关,可以提高励磁电压和发电电压,加速励磁和去磁过程,从而提高SRG系统的发电性能。该文分析了改进型他励变换器的工作模式,对比仿真分析了改进型变换器和常规变换器的不同发电性能,研究了发电时主开关与辅助开关的导通角、辅助电容与负载电容大小对发电系统性能的影响。最后制作了改进型变换器功率电路,搭建了基于dSPACE的实验平台,对改进型变换器和常规变换器的SRG系统进行了实验验证,仿真和实验结果表明,该变换器能显著提高SRG系统的发电电压和功率等性能,实验结果验证了理论分析的正确性和所提改进型他励变换器的有效性。

In order to improve the output performance of switched reluctance generator(SRG)system,an improved separately-excited converter for SRG is proposed in this paper to improve the output voltage and power in DC power generation application.An auxiliary circuit is inserted into the front end of the converter and integrated into the conventional asymmetrical bridge separately excited converter.By controlling the auxiliary switch in the auxiliary circuit,the excitation voltage and generation voltage can be increased,and the excitation and demagnetization process can be accelerated,thereby improving the power generation performance of SRG system.This paper analyzes the working mode of the improved separately excited converter,compares and simulates the different power generation performance of the improved converter and the conventional converter,and studies the influence of the conduction angle of the main switch and the auxiliary switch,the size of the auxiliary capacitance and the load capacitance on the performance of the power generation system.Finally,the power circuit of the improved converter is fabricated,and the experimental platform based on dSPACE is built.The simulation and experimental results show that the improved converter can significantly improve the generation voltage and power of the SRG system.The experimental results verify the correctness of the theoretical analysis and the effectiveness of the proposed improved separately excited converter.