【6h】

Decoupled Space-Vector PWM Strategies for a Four-Level Asymmetrical Open-End Winding Induction Motor Drive With Waveform Symmetries

机译:具有波形对称性的四电平非对称开端绕组感应电动机驱动器的解耦空间矢量PWM策略

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摘要

In this paper, two space-vector-based pulsewidth modulation (PWM) (SVPWM) strategies named equal- and proportional-duty SVPWMs are described, which are used to synthesize a four-level waveform from an open-end winding configuration of an induction motor. Two isolated dc-link voltages, which are in the ratio of 2 : 1, are employed to achieve this objective. Both of these PWM strategies achieve the avoidance of overcharging of the dc-link capacitor of an inverter operating with lower dc-link voltage by its counterpart with higher dc-link voltage. Implementation of these PWM strategies requires only the instantaneous three-phase reference voltages, eliminating the need of sector identification or lookup tables. The numbers of samples per cycle for individual inverters are selected in such a way that the quarter-wave, half-wave, and three-phase symmetries are achieved for the dual-inverter drive despite unequal dc-link voltages for the constituent inverters. It is also shown that one of the two PWM techniques, called the proportional-duty SVPWM, results in a better spectral performance and lower switching power loss in the overall dual-inverter system compared to the equal-duty SVPWM.
机译:本文描述了两种基于空间矢量的脉宽调制(PWM)策略,分别称为等占空比和比例占空比SVPWM,用于从感应的开放式绕组配置中合成四电平波形发动机。为了达到这个目的,采用两个隔离的直流母线电压,它们的比率为2:1。这两种PWM策略均可以避免以较低直流链路电压工作的逆变器的直流链路电容器被较高直流链路电压的逆变器的过充电。这些PWM策略的实现仅需要瞬时三相参考电压,从而无需扇区识别或查找表。选择单个逆变器每个周期的采样数,以使双逆变器驱动实现四分之一波,半波和三相对称,尽管组成逆变器的直流母线电压不相等。还显示出,与相等占空比的SVPWM相比,称为整体占空比SVPWM的两种PWM技术之一在整个双逆变器系统中具有更好的频谱性能和更低的开关功率损耗。

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