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首页> 外文期刊>Arabian Journal for Science and Engineering >A Modified Space Vector PWM Approach for Nine-Level Cascaded H-Bridge Inverter
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A Modified Space Vector PWM Approach for Nine-Level Cascaded H-Bridge Inverter

机译：用于九级级联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：本文提出了九级级联H桥（CHB）逆变器的改进空间矢量脉冲宽度调制（MSVPWM）技术。基于模块化结构和缺少电容器平衡问题，优选CHB逆变器拓扑。如今，空间矢量PWM（SVPWM）控制方案在不同的PWM技术之间取得了更高的关注。通常，基于将更高级别的六边形分解为多个两级六边形的较高水平的六边形来实现SVPWM方法。与传统的SVPWM技术相比，所提出的MSVPWM技术降低了实现九级SVPWM所涉及的计算负担和内存要求。这是通过减少两级六边形的数量而不会损失逆变器输出电压曲线来实现。还提出了一种进一步修改的空间矢量脉冲宽度调制技术，这大大降低了计算工作。通过使用Matlab / Simulink软件工具将所提出的SVPWM技术应用于九个级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方案产生较低的谐波失真和更高的直流总线利用。为了验证所提出的SVPWM技术的实用性，实验结果显示在九级CHB逆变器上。

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