Switched reluctance machine (SRM) drive requires a large dc-link capacitor due to the low-frequency harmonics in dc-link current, which is generated during the current commutation between phases. Installing a bulky capacitor bank in the drive has a significant impact on the cost and the overall volumetric power density of the drive. This article analyzes the dc-link current ripple in SRM drive and proposes a control algorithm to reduce the dc-link current ripple while maintaining the machine performance. The proposed algorithm extracts the ripple components from the dc-link current using a high-pass filter. The controller ensures ripple energy circulation between the phases and reduces the pulsating energy requirement from the dc supply. The dc-link ripple is suppressed at a wide speed range of operation to enable efficient and reliable drive operation without adding any external hardware system. Simulation and experimental results are provided to prove the effectiveness of the proposed control technique for both steady-state and transient conditions.

中文翻译：

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降低开关磁阻电机驱动器的直流母线电流纹波

开关磁阻电机（SRM）驱动器需要较大的直流链路电容器，这是由于直流链路电流中的低频谐波所引起的，该谐波是在相间电流换向期间产生的。在驱动器中安装大容量电容器组会对驱动器的成本和整体体积功率密度产生重大影响。本文分析了SRM驱动器中的直流母线电流纹波，并提出了一种控制算法，可在保持机器性能的同时减少直流母线电流纹波。所提出的算法使用高通滤波器从直流链路电流中提取纹波分量。控制器可确保相之间的波纹能量循环，并减少直流电源的脉动能量需求。直流链路纹波可在较宽的运行速度范围内得到抑制，从而无需增加任何外部硬件系统即可实现高效，可靠的驱动器运行。仿真和实验结果提供了证明所提出的控制技术在稳态和瞬态条件下的有效性。