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A Modified Space Vector PWM Approach for Nine-Level Cascaded H-Bridge Inverter

机译：九级级联H桥逆变器的改进空间矢量PWM方法

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摘要

This paper presents a modified space vector pulse width modulation (MSVPWM) technique for nine-level cascaded H-bridge (CHB) inverter. Based on a modular structure and absence of capacitor balancing problems, CHB inverter topology is preferred. Nowadays, space vector PWM (SVPWM) control scheme has achieved higher attention among different PWM techniques. In general, SVPWM method is realized based on disintegrating higher-level hexagons into a number of two-level hexagons. Compared to conventional SVPWM technique, the proposed MSVPWM technique reduces the computational burden and memory requirement involved in the realization of nine-level SVPWM. This is achieved by reducing the number of two-level hexagons without losing the inverter output voltage profile. Also a further modified space vector pulse width modulation technique is presented, which greatly reduces the computation efforts. The proposed SVPWM techniques are applied to a nine-level CHB inverter by using MATLAB/SIMULINK software tool and are compared with carrier-based sinusoidal pulse width modulation (SPWM) technique to validate the proposed techniques. The proposed SVPWM schemes produce lower harmonic distortion and higher DC bus utilization compared to SPWM technique. To verify the practicality of the proposed SVPWM techniques, experimental results are presented on nine-level CHB inverter.
机译：本文提出了一种改进的空间矢量脉宽调制（MSVPWM）技术，用于九级级联H桥（CHB）逆变器。基于模块化结构且不存在电容器平衡问题，因此首选CHB逆变器拓扑。如今，空间矢量PWM（SVPWM）控制方案已在不同的PWM技术中引起了越来越多的关注。通常，SVPWM方法是基于将高级六边形分解为多个两级六边形来实现的。与传统的SVPWM技术相比，所提出的MSVPWM技术减少了实现九级SVPWM所涉及的计算负担和内存需求。这是通过减少两级六边形的数量而不丢失逆变器输出电压曲线来实现的。还提出了另一种改进的空间矢量脉冲宽度调制技术，该技术大大减少了计算量。通过使用MATLAB / SIMULINK软件工具，将所提出的SVPWM技术应用于9级CHB逆变器，并与基于载波的正弦脉冲宽度调制（SPWM）技术进行比较，以验证所提出的技术。与SPWM技术相比，所提出的SVPWM方案产生的谐波失真更低，并且直流母线利用率更高。为了验证所提出的SVPWM技术的实用性，在九级CHB逆变器上给出了实验结果。

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