Development of fault-tolerant reduced device version with switched-capacitor based multilevel inverter topologies,International Transactions on Electrical Energy Systems

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Development of fault-tolerant reduced device version with switched-capacitor based multilevel inverter topologies
International Transactions on Electrical Energy Systems ( IF 1.9 ) Pub Date : 2021-05-24 , DOI: 10.1002/2050-7038.12893
Dhananjay Kumar ₁ , Rajesh Kumar Nema ₁ , Sushma Gupta ₁

Affiliation

Recently, multilevel inverters (MLIs) are gaining notable importance due to their noteworthy features of “reduced voltage stress” and “total harmonic distortion (THD).” Though MLIs provide a handy solution for renewable energy integration, yet increased numbers of power switches are a major concern for circuit reliability. The reliability can be enhanced with circuit implementation such as reduced device counts (RD) that have fault-tolerant (FT) feature. This article therefore intends to propose two numbers of “modified MLI topologies” configured around “reduced device counts” implementation (RD-MLIs) with the added feature of FT. The proposed topologies in the article are modification over single-phase T-Type RD-MLI. The “modified T-Type topologies” are FT against open circuit fault (OCF) and capable of achieving inherent self-voltage-balance in DC-Link capacitors. The proposed topologies in this article are analyzed for their healthy, faulty, and post fault operation in MATLAB/Simulink environment and a hardware prototype is developed to validate the efficacy of concept and control strategy experimentally. The control strategy is developed as the Simulink model, which is interfaced with dSPACE DS-1104 for generating control pulses to drive switches of modified MLI topologies. The experimental results on proposed “modified single-phase fault-tolerant MLI topologies” validate FT feature against OCF. In essence, the modified topologies offer benefits of having fewer number of diodes, power switches, DC sources, capacitors, drivers and total blocking voltage (TBV in per unit) in comparison to similar other equivalent MLI topologies reported in the literature.

中文翻译：

开发具有基于开关电容器的多电平逆变器拓扑结构的容错简化设备版本

最近，多电平逆变器 (MLI) 因其“降低电压应力”和“总谐波失真 (THD)”的显着特点而变得越来越重要。尽管 MLI 为可再生能源集成提供了方便的解决方案，但增加的电源开关数量是电路可靠性的主要问题。可以通过电路实现来增强可靠性，例如减少具有容错 (FT) 功能的设备数量 (RD)。因此，本文打算提出两个“改进的 MLI 拓扑”，围绕“减少设备数量”实施 (RD-MLI) 进行配置，并增加了 FT 功能。文章中提出的拓扑结构是对单相 T 型 RD-MLI 的修改。“改进的 T 型拓扑”是针对开路故障 (OCF) 的 FT，能够在 DC-Link 电容器中实现固有的自电压平衡。本文中提出的拓扑结构在 MATLAB/Simulink 环境中的健康、故障和故障后操作进行了分析，并开发了硬件原型以通过实验验证概念和控制策略的有效性。控制策略被开发为 Simulink 模型，该模型与 dSPACE DS-1104 接口以生成控制脉冲来驱动修改后的 MLI 拓扑结构的开关。所提出的“改进的单相容错 MLI 拓扑结构”的实验结果验证了 FT 特性对 OCF 的影响。从本质上讲，修改后的拓扑具有以下优点：二极管、电源开关、直流电源、电容器、

更新日期：2021-07-02

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