Comparative Evaluation of DC-link Capacitor RMS Current Stress for Conventional and Reduced Common Mode Voltage SVPWM based Inverters

IF 1 4区工程技术 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS

Compel-The International Journal for Computation and Mathematics in Electrical and Electronic Engineering Pub Date : 2023-06-25 DOI:10.1109/COMPEL52896.2023.10221179

A. A. Khan, N. Zaffar, M. Ikram

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引用次数: 0

Abstract

This work investigates the comparative assessment of DC-link current ripples in perspective of reduced common mode voltage (RCMV) PWM schemes. The anticipated simultaneous reduction of ripple current on DC-link capacitor and common mode voltage compared to traditional PWM approach is seen to exist in certain regions of operation. This may result in reduced thermal stress and consequently in enhanced reliability and operational lifetime. Another increasingly important consideration is for DC microgrids where the inverters are connected directly to the dc-bus and ripple reduction and RCMV for one or more of these inverters is critical for reliable operation. This work utilizes the piece-wise sinusoidal form of DC-link current computing a closed form RMS current expression that is further analyzed for varying load and mod-indices. The RMS DC-link current of conventional space vector PWM has also been analyzed as base case. It would be seen that these modified PWMs mostly put higher ripple stresses on capacitor. However, there are specific regions where one PWM scheme can be employed for reducing DC-link stress.

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基于常规和降低共模电压的SVPWM逆变器直流链路电容RMS电流应力的比较评估

这项工作研究了从降低共模电压(RCMV) PWM方案的角度对直流链路电流波纹的比较评估。与传统的PWM方法相比，预期的直流电容纹波电流和共模电压同时降低在某些工作区域存在。这可以减少热应力，从而提高可靠性和使用寿命。另一个日益重要的考虑因素是直流微电网，其中逆变器直接连接到直流总线，其中一个或多个逆变器的纹波减小和RCMV对于可靠运行至关重要。这项工作利用直流链路电流的分段正弦形式计算封闭形式的RMS电流表达式，并进一步分析了不同负载和模态指数。本文还分析了传统空间矢量PWM直流电流的有效值。可以看出，这些改进的pwm大都对电容器施加了更高的纹波应力。然而，在某些特定区域，可以采用PWM方案来降低直流链路应力。

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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来源期刊

Compel-The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 工程技术-工程：电子与电气

CiteScore

1.60

自引率

0.00%

发文量

124

审稿时长

4.2 months

期刊介绍： COMPEL exists for the discussion and dissemination of computational and analytical methods in electrical and electronic engineering. The main emphasis of papers should be on methods and new techniques, or the application of existing techniques in a novel way. Whilst papers with immediate application to particular engineering problems are welcome, so too are papers that form a basis for further development in the area of study. A double-blind review process ensures the content''s validity and relevance.