Abstract

Floating-capacitor based nine-level inverter topology for open-ended winding induction motor (OWIM) drive is presented in this paper. The proposed multilevel inverter topology (PMLIT) essentially consists of four three-phase two-level voltage source inverters (VSI), three isolated DC sources, and a floating-capacitor (FC). Out of four inverters, three inverters are fed from DC sources, and the fourth inverter is connected with the FC. The advantage of the PMLIT is that the maximum output voltage will be twice the source voltage with nine-levels across each phase winding. The PMLIT employs least number of components which makes the inverter cost effective and has lowered control complexity. The PMLIT can deliver seven, five or three-level output voltage with a decrease in modulation index. Conventional sinusoidal pulse-width modulation (PWM) techniques can be employed to generate switch-gate pulses. The intermediate-voltage levels are realized by proper charging and discharging of the FC. The performance of the PMLIT under possible switch-faults is investigated and modified switching logics are proposed to deliver a balanced supply for the OWIM drive in post-fault operation. Simulations are performed in the MATLAB/Simulink environment and an experimental setup is designed to validate the simulations and results are presented.

摘要

本文介绍了用于开端绕组感应电机 (OWIM) 驱动的基于浮动电容器的九电平逆变器拓扑。所提出的多电平逆变器拓扑 (PMLIT) 主要由四个三相两电平电压源逆变器 (VSI)、三个隔离直流电源和一个浮动电容器 (FC) 组成。在四个逆变器中，三个逆变器由直流电源供电，第四个逆变器与 FC 连接。PMLIT 的优点是最大输出电压将是源电压的两倍，每个相绕组有九个电平。PMLIT 使用最少数量的组件，这使得逆变器具有成本效益并降低了控制复杂性。PMLIT 可以提供七级、五级或三级输出电压，同时降低调制指数。可以采用传统的正弦脉冲宽度调制 (PWM) 技术来生成开关门脉冲。中间电压电平是通过对 FC 进行适当的充电和放电来实现的。研究了 PMLIT 在可能的开关故障下的性能，并提出了修改的开关逻辑，以在故障后操作中为 OWIM 驱动器提供平衡的电源。仿真在 MATLAB/Simulink 环境中进行，并设计了一个实验装置来验证仿真并给出结果。研究了 PMLIT 在可能的开关故障下的性能，并提出了修改的开关逻辑，以在故障后操作中为 OWIM 驱动器提供平衡的电源。仿真在 MATLAB/Simulink 环境中进行，并设计了一个实验装置来验证仿真并给出结果。研究了 PMLIT 在可能的开关故障下的性能，并提出了修改的开关逻辑，以在故障后操作中为 OWIM 驱动器提供平衡的电源。仿真在 MATLAB/Simulink 环境中进行，并设计了一个实验装置来验证仿真并给出结果。