基于三角波和锯齿单极调制方案的降压升压DC-AC变换器总谐波畸变评估

Q3 Engineering

WSEAS Transactions on Power Systems Pub Date : 2022-11-08 DOI:10.37394/232016.2022.17.33

C. Eya, Ayodeji Olalekan Salau, S. L. Braide, S. B. Goyal, V. A. Owoeye, O. Osaloni

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引用次数: 5

摘要

本文介绍了使用三角波和锯齿单极调制方案的降压升压DC-AC变换器的总谐波失真(THD)水平的评估。本文旨在确定一种更好的技术来减轻降压升压直流-交流变换器在单极载波调制方案下的总谐波失真。这是通过将降压升压DC-AC变换器置于基于三角波和基于锯齿的单极调制方案下实现的。采用MATLAB Simulink环境中的功率GUI快速傅立叶变换(FFT)分析工具，对各方案下降压-升压直流-交流变换器的电压和电流输出进行了分析，而不是采用传统的计算THD百分比的方案。该测试系统由DC-DC降压-升压变换器、h桥绝缘单极栅极晶体管和逻辑控制单元组成。在相同的Buck-boost DC-AC变换器电路上，采用锯齿型单极调制方案获得的THD为0.2865%，峰值输出电压为294.1V，电流为9.805A，而采用三角波型双极调制方案获得的THD为0.1479%，峰值输出电压为297.4V，电流为9.53A。结果表明，与锯齿型单极调制技术相比，三角波单极调制方案具有较高的功率因数利用率和较低的功率损耗，可改善降压-升压变换器系统的性能特征。本研究表明，在大电流和低THD%的情况下，电力驱动和重载机器的电力负载需要使用基于锯齿的单极调制(STBUM)方案，而敏感的电力负载，如医院设备和通信行业的电力电子设备，由于电流和THD%低，需要使用基于三角波的单极调制(TWBUM)方案。

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Assessment of Total Harmonic Distortion in Buck-Boost DC-AC Converters using Triangular Wave and Saw-Tooth based Unipolar Modulation Schemes

This paper presents an assessment of the levels of total harmonic distortion (THD) in buck-boost DC-AC converters using triangular wave and saw-tooth unipolar based-modulation schemes. This paper seeks to identify a better technique for mitigating the total harmonic distortion on buck-boost DC-AC converters under unipolar carrier-based modulation schemes. This was achieved by subjecting the buck-boost DC-AC converter under triangular wave-based and saw-tooth based-unipolar modulation schemes. The voltage and current output of the buck- boost DC-AC converter under each scheme was analysed using a power GUI Fast Fourier Transform (FFT) analytical tool resident in the MATLAB Simulink environment unlike with the conventional scheme of computing the percentage of THD. The test system was obtained by a combination of DC-DC buck-boost converter, H-bridge based-insulated unipolar gate transistors, and a logic control unit. It was realized that THD of 0.2865%, peak output voltage of 294.1V and current of 9.805A were obtained by using the saw-tooth based-unipolar modulation scheme, whereas a THD of 0.1479%, peak output voltage of 297.4V and current of 9.53A were obtained by using the triangular wave based-bipolar modulation scheme on the same Buck-boost DC-AC converter circuit. The results imply a high power factor utilization and low power loss in the triangular wave based-unipolar modulation scheme compared to the saw-tooth based-unipolar modulation technique for improving the performance characteristics of the buck-boost converter system. This study showed that power drives and heavy load machines based-power electrical loads are required to use the saw-tooth based-unipolar modulation (STBUM) scheme for high current and low THD%, whereas sensitive power electrical loads such as hospital equipment and communication industries based-power electronic devices are required to use the triangular wave-based unipolar modulation (TWBUM) scheme due to low current and THD%.

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来源期刊

WSEAS Transactions on Power Systems Engineering-Industrial and Manufacturing Engineering

CiteScore

1.10

自引率

0.00%

发文量

期刊介绍： WSEAS Transactions on Power Systems publishes original research papers relating to electric power and energy. We aim to bring important work to a wide international audience and therefore only publish papers of exceptional scientific value that advance our understanding of these particular areas. The research presented must transcend the limits of case studies, while both experimental and theoretical studies are accepted. It is a multi-disciplinary journal and therefore its content mirrors the diverse interests and approaches of scholars involved with generation, transmission & distribution planning, alternative energy systems, power market, switching and related areas. We also welcome scholarly contributions from officials with government agencies, international agencies, and non-governmental organizations.