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Associating PWM and balancing techniques for performance improvement of flying capacitor inverter

机译：结合PWM和平衡技术以改善飞跨电容器逆变器的性能

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This paper aims at the reduction of the harmonic content in sinusoidal signals synthesized from flying capacitor multilevel inverters for AC electrical drive systems. In this sense, three distinct voltage-balancing techniques and pulse width modulation methods are jointly investigated. Among voltage-balancing techniques, a new method including restrictions of switching under charging/discharging and maximum current in the flying capacitors is presented. The strategies are analysed in a three-level inverter controlled by space-vector and carrier-based pulse width modulation (PWM). Regarding the carrier-wave strategy, specifically level shifted — phase disposition modulation (LSPWM — PDPWM), the authors propose a redundant switching states controller that enables the application of this technique to the flying capacitor topologies including an appropriate portion of the third harmonic component for greater utilization of the DC voltage bus. All techniques were validated using MatLab simulations and, in the SVPWM case, experimentally too. The results obtained have been comproved the main desired characteristics, namely output voltages and currents with low harmonic content, low computational complexity and ease of digital implementation.
机译：本文旨在降低交流电驱动系统中飞跨电容器多电平逆变器合成的正弦信号中的谐波含量。从这个意义上讲，三种不同的电压平衡技术和脉冲宽度调制方法被联合研究。在电压平衡技术中，提出了一种新方法，该方法包括在充电/放电条件下进行开关限制以及飞跨电容器中的最大电流。在由空间矢量和基于载波的脉冲宽度调制（PWM）控制的三电平逆变器中分析了这些策略。关于载波策略，特别是电平移位相位配置调制（LSPWM-PDPWM），作者提出了一种冗余开关状态控制器，该控制器使该技术能够应用于飞电容拓扑，其中包括三次谐波分量的适当部分，以用于直流电压总线的利用率更高。所有技术均已通过MatLab仿真以及SVPWM案例进行了实验验证。获得的结果已经得到了主要的期望特性的认可，即具有低谐波含量，低计算复杂度和易于数字实现的输出电压和电流。

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