An efficient three‐phase two‐level voltage source inverter with the suppression of the dead time effect

IF 1.8 3区工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

International Journal of Circuit Theory and Applications Pub Date : 2024-07-12 DOI:10.1002/cta.4180

Qiang Wang, Xiang Gong, Youzheng Wang

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引用次数: 0

Abstract

The paper carries out the research on a novel two‐level voltage source inverter to further improve the output power quality of the inverter under the premise of efficient operation. Main switches can realize zero‐voltage switching in a wide load range to ensure the efficient operation of the designed inverter. Total harmonic distortion (THD) of the output current at low output frequencies can be improved by the modification of resonant tanks in the designed inverter. In the dead time, the modified resonant tanks can result in a shorter duration of nonlinear changes in the output phase voltage at lower load current, which is beneficial for reducing the output voltage error caused by dead time. The improved power quality at low output frequencies is conductive to the use of the designed inverter in the drive system of the low‐speed AC motor. The paper expounds every operating status during a switching period. The experiment manifests that switches realize soft switching. The efficiency of the designed inverter reaches 98.6% at rated operation state, which is 0.3% and 0.5% more than that of two comparison objects, respectively. Moreover, when the output frequency reduces to 5 Hz, the THD of the output current is only 2%, which is also less than that of comparison objects. Hence, the designed inverter has advantages in the efficiency and the output power quality.

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抑制死区时间效应的高效三相两电平电压源逆变器

本文对新型两电平电压源逆变器进行了研究，以在高效运行的前提下进一步提高逆变器的输出电能质量。主开关可在宽负载范围内实现零电压开关，从而确保所设计的逆变器高效运行。在低输出频率下，输出电流的总谐波失真（THD）可以通过改进设计变频器中的谐振槽来改善。在死区时间内，改进后的谐振槽可缩短低负载电流下输出相电压非线性变化的持续时间，这有利于减少死区时间造成的输出电压误差。低输出频率下电能质量的改善有利于在低速交流电机的驱动系统中使用所设计的逆变器。本文阐述了开关期间的各种工作状态。实验表明，开关实现了软切换。在额定运行状态下，所设计变频器的效率达到 98.6%，分别比两个对比对象高出 0.3% 和 0.5%。此外，当输出频率降至 5 Hz 时，输出电流的总谐波失真（THD）仅为 2%，也低于对比对象。因此，所设计的逆变器在效率和输出电能质量方面都具有优势。

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

International Journal of Circuit Theory and Applications 工程技术-工程：电子与电气

CiteScore

3.60

自引率

34.80%

发文量

277

审稿时长

4.5 months

期刊介绍： The scope of the Journal comprises all aspects of the theory and design of analog and digital circuits together with the application of the ideas and techniques of circuit theory in other fields of science and engineering. Examples of the areas covered include: Fundamental Circuit Theory together with its mathematical and computational aspects; Circuit modeling of devices; Synthesis and design of filters and active circuits; Neural networks; Nonlinear and chaotic circuits; Signal processing and VLSI; Distributed, switched and digital circuits; Power electronics; Solid state devices. Contributions to CAD and simulation are welcome.