Development and performance assessment of switched-capacitor multilevel inverters for solar PV applications

IF 7.1 2区工程技术 Q1 ENERGY & FUELS

Sustainable Energy Technologies and Assessments Pub Date : 2025-05-29 DOI:10.1016/j.seta.2025.104360

Yatindra Gopal , Kaibalya Prasad Panda , Pranda Prasanta Gupta , Dheeraj Kumar Dhaked , Yogendra Arya

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引用次数: 0

Abstract

The increasing need for improved power quality and greater power capacity has prompted the development of switched-capacitor multilevel inverters (SCMLIs) for photovoltaic (PV) systems. The SCMLIs enable self-balancing and voltage boosting to generate a step-up AC output voltage. With a focus on reducing the number of components, this paper presents a seven-level (7L)-PV based-reduced SCMLI (7L-PV-RSCMLI) topology, designed for low to medium power applications. To enhance the performance of the PV system, a new modified Regula Falsi method (MRFM) algorithm is used to track the maximum power point. By utilizing a combination of self-balanced capacitors and switches, the inverter generates 7L stepped output voltage waveform which improves power quality. The proposed topology achieves 7L output voltage with a peak value three times of the input DC-bus voltage. Therefore, the proposed 7L-PV-RSCMLI boosts the voltage output using only eight switches and has reduced size compared to existing 7L inverters, as demonstrated by a detailed comparative analysis. A simplified carrier-based pulse width modulation technique is employed to verify the operation of the standalone PV system. The performance of the proposed design is analyzed and validated through simulations in the MATLAB® Simulink environment. Furthermore, experimental results from a laboratory prototype under transient conditions confirm the performance and validity of the proposed inverter. The total harmonic distortion of the 7L inverter output voltage observed in the simulation and experimental results are 11.41 % and 11.64 %, respectively.

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太阳能光伏用开关电容多电平逆变器的研制与性能评估

对电能质量和容量的需求日益增长，促使了用于光伏（PV）系统的开关电容多电平逆变器（SCMLIs）的发展。scmli使自平衡和电压升压产生升压交流输出电压。为了减少组件的数量，本文提出了一种基于七电平（7L） pv的简化SCMLI （7L-PV- rscmli）拓扑结构，专为中低功率应用而设计。为了提高光伏系统的性能，采用了一种新的改进的正则法（MRFM）算法来跟踪最大功率点。通过利用自平衡电容器和开关的组合，逆变器产生7L阶跃输出电压波形，提高了电能质量。该拓扑实现7L输出电压，峰值为输入直流母线电压的三倍。因此，正如详细的比较分析所证明的那样，所提出的7L- pv - rscmli仅使用8个开关就可以提高电压输出，并且与现有的7L逆变器相比，尺寸更小。采用一种简化的基于载波的脉宽调制技术来验证独立光伏系统的运行情况。通过MATLAB®Simulink环境下的仿真分析和验证了所提出设计的性能。此外，实验室样机在瞬态条件下的实验结果证实了该逆变器的性能和有效性。仿真和实验结果观察到7L逆变器输出电压的总谐波畸变分别为11.41%和11.64%。

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

Sustainable Energy Technologies and Assessments Energy-Renewable Energy, Sustainability and the Environment

CiteScore

12.70

自引率

12.50%

发文量

1091

期刊介绍： Encouraging a transition to a sustainable energy future is imperative for our world. Technologies that enable this shift in various sectors like transportation, heating, and power systems are of utmost importance. Sustainable Energy Technologies and Assessments welcomes papers focusing on a range of aspects and levels of technological advancements in energy generation and utilization. The aim is to reduce the negative environmental impact associated with energy production and consumption, spanning from laboratory experiments to real-world applications in the commercial sector.