ABSTRACT

In this work, a quasi-impedance source (QIS) converter is employed as a front-end converter for four-phase switched reluctance (SR) motor drive. The QIS converter is used for dc-link voltage boosting and to enhance the dynamicperformance. The proposed converter can increase the power output in each stage, by increasing the excitation voltage and controlling based on the drive specifications. The demagnetisation terminal is separated from the excitation terminal, and then the voltage is increased further to achieve the quick commutation. Therefore, with the proposed converter, the SR motor can operate with higher voltages at each interval to reach the end goal of faster excitation and commutation. Thus, it eliminates the production of negative torque and reduces the torque ripple. Initially, the steady-state characteristics have been analyzed with the classical asymmetric bridge (CAB) converter and the proposed converter. According to the steady-state characteristics, the proposed converter can provide higher torque and increased power output than the CAB converter. The effectiveness of the proposed converter is validated in a MATLAB/Simulink environment and compared with the CAB converter. Finally, the experimental response is tested using Xilinx SPARTAN 6 FPGA processor and compared with the simulation results.

摘要

在这项工作中，准阻抗源 (QIS) 转换器被用作四相开关磁阻 (SR) 电机驱动的前端转换器。QIS 转换器用于直流链路升压和增强动态性能。所提出的转换器可以通过增加激励电压并根据驱动器规格进行控制来增加每个阶段的功率输出。退磁端与励磁端分开，进一步提高电压，实现快速换向。因此，使用所提出的转换器，SR 电机可以在每个间隔以更高的电压运行，以达到更快的励磁和换向的最终目标。因此，它消除了负转矩的产生并减少了转矩脉动。最初，使用经典的非对称桥 (CAB) 转换器和所提出的转换器分析了稳态特性。根据稳态特性，所提出的转换器可以提供比 CAB 转换器更高的转矩和增加的功率输出。所提出转换器的有效性在 MATLAB/Simulink 环境中得到验证，并与 CAB 转换器进行了比较。最后，使用 Xilinx SPARTAN 6 FPGA 处理器测试实验响应，并与仿真结果进行比较。所提出转换器的有效性在 MATLAB/Simulink 环境中得到验证，并与 CAB 转换器进行了比较。最后，使用 Xilinx SPARTAN 6 FPGA 处理器测试实验响应，并与仿真结果进行比较。所提出转换器的有效性在 MATLAB/Simulink 环境中得到验证，并与 CAB 转换器进行了比较。最后，使用 Xilinx SPARTAN 6 FPGA 处理器测试实验响应，并与仿真结果进行比较。