Reliability of DC-link Capacitors in Three-Level NPC Inverters under different PWM Methods

被引：10

作者：

Sangwongwanich, Ariya ^{[1
]}

Novak, Mateja ^{[1
]}

Sangwongwanich, Somboon ^{[2
]}

Blaabjerg, Frede ^{[1
]}

机构：

[1] Aalborg Univ, AAU Energy, DK-9220 Aalborg, Denmark

[2] Chulalongkorn Univ, Dept Elect Engn, Bangkok, Thailand

来源：

2022 IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION, APEC | 2022年

关键词：

TermsDReliability; capacitors; power loss; pulse-width modulation (PWM); three-level inverter; VOLTAGE OSCILLATIONS; CONVERTER;

D O I：

10.1109/APEC43599.2022.9773594

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Pulse-width modulation (PWM) method plays an important role to ensure high efficiency and reliability of the three-level neutral-point-clamped (NPC) inverter. However, a comparison of the PWM methods in previous research has only considered power loss and reliability of power devices, while other reliability-critical components such as dc-link capacitors are not taken into account in the analysis. In this paper, the impact of PWM methods on the reliability of the dc-link capacitors in three-level NPC inverters is investigated by considering the capacitor power loss and their thermal stress. The evaluation results indicate that the PWM method which aims at minimizing the switching loss may introduce a significant power loss in the dc-link capacitors due to high amplitude of the low-frequency neutral-point (NP) voltage fluctuation. In that case, the thermal stress of the dc-link capacitors can be significantly increased, especially when the discontinuous modulation scheme is applied, affecting the reliability of the dc-link capacitors.

引用

页码：1804 / 1811

页数：8

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