Uniform Distribution Spread-spectrum Modulation Strategy for MMC to Reduce Conducted EMI and Switching Loss

Q1 Engineering Chinese Journal of Electrical Engineering Pub Date : 2022-12-01 DOI:10.23919/CJEE.2022.000037

Hui Liu;Jianan Chen;Dong Jiang;Hong Li;Xuejun Pei;Wei Sun

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引用次数: 1

Abstract

Modular multilevel converters (MMCs) have been widely used owing to their superior performance. However, the rapid switching of power electronics devices causes serious electromagnetic interference (EMI). There are a large number of obvious EMI peaks in the frequency spectrum of the carrier phase-shifted constant-switching-frequency pulse-width modulation (CSFPWM). Spreading the EMI across a wider frequency range can help to reduce the EMI peaks. In this study, we designed a uniform distribution (UD) spread-spectrum modulation technology using the principle of uniform switching frequency distribution and minimum switching loss for MMC. Its feasibility is verified by theoretical derivation and simulation. Then, the effectiveness of UDPWM in reducing the EMI is verified in experiments with a prototype MMC testbed in the lab. Compared with traditional CSFPWM, UDPWM can reduce conducted EMI by 10–20 dB. Also, compared with random PWM (RPWM), UDPWM can improve efficiency and reduce total harmonic distortion (THD) of output voltage and current in MMC.

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减少传导电磁干扰和开关损耗的均匀分布扩频调制策略

模块化多电平变换器(MMCs)以其优越的性能得到了广泛的应用。然而，电力电子器件的快速开关会产生严重的电磁干扰。载波相移恒开关频率脉宽调制(CSFPWM)的频谱中存在大量明显的电磁干扰峰。将电磁干扰扩展到更宽的频率范围有助于降低电磁干扰峰值。在本研究中，我们利用均匀开关频率分布和最小开关损耗的原理，为MMC设计了一种均匀分布(UD)扩频调制技术。通过理论推导和仿真验证了该方法的可行性。然后，在实验室的MMC原型测试台上，通过实验验证了UDPWM降低电磁干扰的有效性。与传统的CSFPWM相比，UDPWM可将传导EMI降低10 ~ 20 dB。与随机PWM (RPWM)相比，UDPWM可以提高效率，降低MMC输出电压和电流的总谐波失真(THD)。

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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