An improved CPS-SPWM and unified modulation strategy for multilevel converter

2016 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) Pub Date : 2016-10-01 DOI:10.1109/APPEEC.2016.7779705

Haitao Zhang, Yongqing Meng, Xiuli Wang, Yuntao Zou, Xiong Wu, Chunyang Liu, Qian Zhou, Weiping Zhu

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引用次数: 3

Abstract

Due to the modularity, scalability and low loss compared with the traditional VSC converter, MMC based converter has raised a research hotspot in the field of direct-current transmission and direct-current distribution. Different from the direct-current transmission, the voltage level for direct-current distribution is relative low, resulting in a relative low level of the output waveforms. So the stair-case modulation, which may introduce numerous harmonic in low level, is not applicable to the direct-current distribution. To resolve this problem, we propose an improved carrier phase-shifted SPWM (ICPS-SPWM) in this paper, which is easier for digital implementation and has a better harmonic performance compared with traditional one. Besides, based on the improved carrier phase-shifted SPWM (ICPS-SPWM), a unified modulation is proposed, which can switch between ICPS-SPWM and space-vector PWM modulation (SVPWM) for multilevel easily and flexibly. In the end, simulation based on Matlab is presented to validate the effectiveness of the proposed modulation strategy.

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多电平变换器的改进CPS-SPWM和统一调制策略

与传统的VSC变换器相比，基于MMC的变换器由于具有模块化、可扩展性和低损耗等优点，成为直流输电和直流配电领域的研究热点。与直流传输不同，直流分布的电压电平相对较低，导致输出波形电平相对较低。因此，可能在低电平引入大量谐波的阶梯调制不适用于直流配电。为了解决这一问题，本文提出了一种改进的载波移相SPWM (ICPS-SPWM)，它比传统的载波移相SPWM更易于数字化实现，并且具有更好的谐波性能。此外，在改进载波移相PWM (ICPS-SPWM)的基础上，提出了一种统一的多电平调制方式，可以在ICPS-SPWM和空间矢量PWM (SVPWM)之间轻松灵活地切换。最后，通过Matlab仿真验证了所提调制策略的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2016 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

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