基于四电平功率变换电路的开关磁阻电机瞬时转矩控制

主要论述了基于四电平功率变换电路的开关磁阻电机直接瞬时转矩控制.在常规功率变换电路的驱动下,采用直接瞬时转矩控制虽然改善了开关磁阻电机驱动系统所固有的高转矩脉动,但由于励磁电流的上升和下降相对缓慢,使得系统的效率和动态性能有所降低.而四电平功率变换电路因能提供高电压给开关磁阻电机,使得励磁电流上升和下降所需时间减少,因此可改善开关磁阻系统的效率和动态性能.在基于四电平功率变换电路的SRM系统中,利用直接瞬时转矩控制,提出了在各种工作模式下的新的控制方法.所提方法通过计算机仿真和DSP驱动实验,证明了其有效性.

Direct Instantaneous Torque Control of SRM Using Four-level Converter

In this paper, a direct instantaneous torque control (DITC) of switched reluctance motor (SRM) with a four-level converter is presented. The DITC method can reduce the high inherent torque ripple of SRM drive system, but driving efficiency and dynamic performance are somewhat low due to the slow excitation current build-up of convensional converter. Since the four-level converter can supply an addition boosted voltage to the SRM, it can obtain fast excitation current and demagnetization current. Consequently, it can improve dynamic performance and efficiency of SRM easily. For the proper application of DITC using a four-level converter, a new control scheme is presented according to the operating mode in this paper. The validity of proposed method is verified by the computer simulation and experiments.